refactor networm map generation

Signed-off-by: bcmmbaga <bethuelmbaga12@gmail.com>

.github/workflows/golang-test-linux.yml

@@ -258,7 +258,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [ '386','amd64' ]
+        arch: [ 'amd64' ]
         store: [ 'sqlite', 'postgres', 'mysql' ]
     runs-on: ubuntu-22.04
     steps:
@@ -325,8 +325,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [ '386','amd64' ]
+        arch: [ 'amd64' ]
-        store: [ 'sqlite', 'postgres', 'mysql' ]
+        store: [ 'sqlite', 'postgres' ]
     runs-on: ubuntu-22.04
     steps:
       - name: Install Go
@@ -392,7 +392,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [ '386','amd64' ]
+        arch: [ 'amd64' ]
         store: [ 'sqlite', 'postgres' ]
     runs-on: ubuntu-22.04
     steps:
@@ -461,7 +461,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [ '386','amd64' ]
+        arch: [ 'amd64' ]
         store: [ 'sqlite', 'postgres']
     runs-on: ubuntu-22.04
     steps:

client/cmd/forwarding_rules.go

@@ -0,0 +1,98 @@
+package cmd
+
+import (
+	"fmt"
+	"sort"
+
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc/status"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+var forwardingRulesCmd = &cobra.Command{
+	Use:   "forwarding",
+	Short: "List forwarding rules",
+	Long:  `Commands to list forwarding rules.`,
+}
+
+var forwardingRulesListCmd = &cobra.Command{
+	Use:     "list",
+	Aliases: []string{"ls"},
+	Short:   "List forwarding rules",
+	Example: "  netbird forwarding list",
+	Long:    "Commands to list forwarding rules.",
+	RunE:    listForwardingRules,
+}
+
+func listForwardingRules(cmd *cobra.Command, _ []string) error {
+	conn, err := getClient(cmd)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	client := proto.NewDaemonServiceClient(conn)
+	resp, err := client.ForwardingRules(cmd.Context(), &proto.EmptyRequest{})
+	if err != nil {
+		return fmt.Errorf("failed to list network: %v", status.Convert(err).Message())
+	}
+
+	if len(resp.GetRules()) == 0 {
+		cmd.Println("No forwarding rules available.")
+		return nil
+	}
+
+	printForwardingRules(cmd, resp.GetRules())
+	return nil
+}
+
+func printForwardingRules(cmd *cobra.Command, rules []*proto.ForwardingRule) {
+	cmd.Println("Available forwarding rules:")
+
+	// Sort rules by translated address
+	sort.Slice(rules, func(i, j int) bool {
+		if rules[i].GetTranslatedAddress() != rules[j].GetTranslatedAddress() {
+			return rules[i].GetTranslatedAddress() < rules[j].GetTranslatedAddress()
+		}
+		if rules[i].GetProtocol() != rules[j].GetProtocol() {
+			return rules[i].GetProtocol() < rules[j].GetProtocol()
+		}
+
+		return getFirstPort(rules[i].GetDestinationPort()) < getFirstPort(rules[j].GetDestinationPort())
+	})
+
+	var lastIP string
+	for _, rule := range rules {
+		dPort := portToString(rule.GetDestinationPort())
+		tPort := portToString(rule.GetTranslatedPort())
+		if lastIP != rule.GetTranslatedAddress() {
+			lastIP = rule.GetTranslatedAddress()
+			cmd.Printf("\nTranslated peer: %s\n", rule.GetTranslatedHostname())
+		}
+
+		cmd.Printf("  Local %s/%s to %s:%s\n", rule.GetProtocol(), dPort, rule.GetTranslatedAddress(), tPort)
+	}
+}
+
+func getFirstPort(portInfo *proto.PortInfo) int {
+	switch v := portInfo.PortSelection.(type) {
+	case *proto.PortInfo_Port:
+		return int(v.Port)
+	case *proto.PortInfo_Range_:
+		return int(v.Range.GetStart())
+	default:
+		return 0
+	}
+}
+
+func portToString(translatedPort *proto.PortInfo) string {
+	switch v := translatedPort.PortSelection.(type) {
+	case *proto.PortInfo_Port:
+		return fmt.Sprintf("%d", v.Port)
+	case *proto.PortInfo_Range_:
+		return fmt.Sprintf("%d-%d", v.Range.GetStart(), v.Range.GetEnd())
+	default:
+		return "No port specified"
+	}
+}

client/cmd/root.go

@@ -145,6 +145,7 @@ func init() {
 	rootCmd.AddCommand(versionCmd)
 	rootCmd.AddCommand(sshCmd)
 	rootCmd.AddCommand(networksCMD)
+	rootCmd.AddCommand(forwardingRulesCmd)
 	rootCmd.AddCommand(debugCmd)
 
 	serviceCmd.AddCommand(runCmd, startCmd, stopCmd, restartCmd) // service control commands are subcommands of service
@@ -153,6 +154,8 @@ func init() {
 	networksCMD.AddCommand(routesListCmd)
 	networksCMD.AddCommand(routesSelectCmd, routesDeselectCmd)
 
+	forwardingRulesCmd.AddCommand(forwardingRulesListCmd)
+
 	debugCmd.AddCommand(debugBundleCmd)
 	debugCmd.AddCommand(logCmd)
 	logCmd.AddCommand(logLevelCmd)

client/cmd/testutil_test.go

@@ -10,6 +10,7 @@ import (
 	"go.opentelemetry.io/otel"
 
 	"github.com/netbirdio/netbird/management/server/activity"
+	"github.com/netbirdio/netbird/management/server/integrations/port_forwarding"
 	"github.com/netbirdio/netbird/management/server/settings"
 	"github.com/netbirdio/netbird/management/server/store"
 	"github.com/netbirdio/netbird/management/server/telemetry"
@@ -89,13 +90,13 @@ func startManagement(t *testing.T, config *mgmt.Config, testFile string) (*grpc.
 	metrics, err := telemetry.NewDefaultAppMetrics(context.Background())
 	require.NoError(t, err)
 
-	accountManager, err := mgmt.BuildManager(context.Background(), store, peersUpdateManager, nil, "", "netbird.selfhosted", eventStore, nil, false, iv, metrics)
+	accountManager, err := mgmt.BuildManager(context.Background(), store, peersUpdateManager, nil, "", "netbird.selfhosted", eventStore, nil, false, iv, metrics, port_forwarding.NewControllerMock(), settings.NewManagerMock())
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	secretsManager := mgmt.NewTimeBasedAuthSecretsManager(peersUpdateManager, config.TURNConfig, config.Relay)
-	mgmtServer, err := mgmt.NewServer(context.Background(), config, accountManager, settings.NewManager(store), peersUpdateManager, secretsManager, nil, nil, nil)
+	mgmtServer, err := mgmt.NewServer(context.Background(), config, accountManager, settings.NewManagerMock(), peersUpdateManager, secretsManager, nil, nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}

client/embed/embed.go

@@ -134,10 +134,11 @@ func (c *Client) Start(startCtx context.Context) error {
 
 	// either startup error (permanent backoff err) or nil err (successful engine up)
 	// TODO: make after-startup backoff err available
-	run := make(chan error, 1)
+	run := make(chan struct{}, 1)
+	clientErr := make(chan error, 1)
 	go func() {
 		if err := client.Run(run); err != nil {
-			run <- err
+			clientErr <- err
 		}
 	}()
 
@@ -147,13 +148,9 @@ func (c *Client) Start(startCtx context.Context) error {
 			return fmt.Errorf("stop error after context done. Stop error: %w. Context done: %w", stopErr, startCtx.Err())
 		}
 		return startCtx.Err()
-	case err := <-run:
+	case err := <-clientErr:
-		if err != nil {
-			if stopErr := client.Stop(); stopErr != nil {
-				return fmt.Errorf("stop error after failed to startup. Stop error: %w. Start error: %w", stopErr, err)
-			}
 		return fmt.Errorf("startup: %w", err)
-		}
+	case <-run:
 	}
 
 	c.connect = client

client/firewall/create.go

@@ -10,17 +10,18 @@ import (
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
 // NewFirewall creates a firewall manager instance
-func NewFirewall(iface IFaceMapper, _ *statemanager.Manager, disableServerRoutes bool) (firewall.Manager, error) {
+func NewFirewall(iface IFaceMapper, _ *statemanager.Manager, flowLogger nftypes.FlowLogger, disableServerRoutes bool) (firewall.Manager, error) {
 	if !iface.IsUserspaceBind() {
 		return nil, fmt.Errorf("not implemented for this OS: %s", runtime.GOOS)
 	}
 
 	// use userspace packet filtering firewall
-	fm, err := uspfilter.Create(iface, disableServerRoutes)
+	fm, err := uspfilter.Create(iface, disableServerRoutes, flowLogger)
 	if err != nil {
 		return nil, err
 	}

client/firewall/create_linux.go

@@ -15,6 +15,7 @@ import (
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 	nbnftables "github.com/netbirdio/netbird/client/firewall/nftables"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
@@ -33,7 +34,7 @@ const SKIP_NFTABLES_ENV = "NB_SKIP_NFTABLES_CHECK"
 // FWType is the type for the firewall type
 type FWType int
 
-func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager, disableServerRoutes bool) (firewall.Manager, error) {
+func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager, flowLogger nftypes.FlowLogger, disableServerRoutes bool) (firewall.Manager, error) {
 	// on the linux system we try to user nftables or iptables
 	// in any case, because we need to allow netbird interface traffic
 	// so we use AllowNetbird traffic from these firewall managers
@@ -47,7 +48,7 @@ func NewFirewall(iface IFaceMapper, stateManager *statemanager.Manager, disableS
 	if err != nil {
 		log.Warnf("failed to create native firewall: %v. Proceeding with userspace", err)
 	}
-	return createUserspaceFirewall(iface, fm, disableServerRoutes)
+	return createUserspaceFirewall(iface, fm, disableServerRoutes, flowLogger)
 }
 
 func createNativeFirewall(iface IFaceMapper, stateManager *statemanager.Manager, routes bool) (firewall.Manager, error) {
@@ -77,12 +78,12 @@ func createFW(iface IFaceMapper) (firewall.Manager, error) {
 	}
 }
 
-func createUserspaceFirewall(iface IFaceMapper, fm firewall.Manager, disableServerRoutes bool) (firewall.Manager, error) {
+func createUserspaceFirewall(iface IFaceMapper, fm firewall.Manager, disableServerRoutes bool, flowLogger nftypes.FlowLogger) (firewall.Manager, error) {
 	var errUsp error
 	if fm != nil {
-		fm, errUsp = uspfilter.CreateWithNativeFirewall(iface, fm, disableServerRoutes)
+		fm, errUsp = uspfilter.CreateWithNativeFirewall(iface, fm, disableServerRoutes, flowLogger)
 	} else {
-		fm, errUsp = uspfilter.Create(iface, disableServerRoutes)
+		fm, errUsp = uspfilter.Create(iface, disableServerRoutes, flowLogger)
 	}
 
 	if errUsp != nil {

client/firewall/iface.go

@@ -4,12 +4,13 @@ import (
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // IFaceMapper defines subset methods of interface required for manager
 type IFaceMapper interface {
 	Name() string
-	Address() device.WGAddress
+	Address() wgaddr.Address
 	IsUserspaceBind() bool
 	SetFilter(device.PacketFilter) error
 	GetDevice() *device.FilteredDevice

client/firewall/iptables/acl_linux.go

@@ -32,8 +32,6 @@ type entry struct {
 type aclManager struct {
 	iptablesClient  *iptables.IPTables
 	wgIface         iFaceMapper
-	routingFwChainName string
-
 	entries         aclEntries
 	optionalEntries map[string][]entry
 	ipsetStore      *ipsetStore
@@ -41,12 +39,10 @@ type aclManager struct {
 	stateManager *statemanager.Manager
 }
 
-func newAclManager(iptablesClient *iptables.IPTables, wgIface iFaceMapper, routingFwChainName string) (*aclManager, error) {
+func newAclManager(iptablesClient *iptables.IPTables, wgIface iFaceMapper) (*aclManager, error) {
 	m := &aclManager{
 		iptablesClient:  iptablesClient,
 		wgIface:         wgIface,
-		routingFwChainName: routingFwChainName,
-
 		entries:         make(map[string][][]string),
 		optionalEntries: make(map[string][]entry),
 		ipsetStore:      newIpsetStore(),
@@ -79,6 +75,7 @@ func (m *aclManager) init(stateManager *statemanager.Manager) error {
 }
 
 func (m *aclManager) AddPeerFiltering(
+	id []byte,
 	ip net.IP,
 	protocol firewall.Protocol,
 	sPort *firewall.Port,
@@ -314,9 +311,12 @@ func (m *aclManager) seedInitialEntries() {
 	m.appendToEntries("INPUT", []string{"-i", m.wgIface.Name(), "-j", chainNameInputRules})
 	m.appendToEntries("INPUT", append([]string{"-i", m.wgIface.Name()}, established...))
 
+	// Inbound is handled by our ACLs, the rest is dropped.
+	// For outbound we respect the FORWARD policy. However, we need to allow established/related traffic for inbound rules.
 	m.appendToEntries("FORWARD", []string{"-i", m.wgIface.Name(), "-j", "DROP"})
-	m.appendToEntries("FORWARD", []string{"-i", m.wgIface.Name(), "-j", m.routingFwChainName})
+
-	m.appendToEntries("FORWARD", append([]string{"-o", m.wgIface.Name()}, established...))
+	m.appendToEntries("FORWARD", []string{"-o", m.wgIface.Name(), "-j", chainRTFWDOUT})
+	m.appendToEntries("FORWARD", []string{"-i", m.wgIface.Name(), "-j", chainRTFWDIN})
 }
 
 func (m *aclManager) seedInitialOptionalEntries() {

client/firewall/iptables/manager_linux.go

@@ -13,7 +13,7 @@ import (
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
@@ -31,7 +31,7 @@ type Manager struct {
 // iFaceMapper defines subset methods of interface required for manager
 type iFaceMapper interface {
 	Name() string
-	Address() iface.WGAddress
+	Address() wgaddr.Address
 	IsUserspaceBind() bool
 }
 
@@ -52,7 +52,7 @@ func Create(wgIface iFaceMapper) (*Manager, error) {
 		return nil, fmt.Errorf("create router: %w", err)
 	}
 
-	m.aclMgr, err = newAclManager(iptablesClient, wgIface, chainRTFWD)
+	m.aclMgr, err = newAclManager(iptablesClient, wgIface)
 	if err != nil {
 		return nil, fmt.Errorf("create acl manager: %w", err)
 	}
@@ -96,21 +96,22 @@ func (m *Manager) Init(stateManager *statemanager.Manager) error {
 //
 // Comment will be ignored because some system this feature is not supported
 func (m *Manager) AddPeerFiltering(
+	id []byte,
 	ip net.IP,
-	protocol firewall.Protocol,
+	proto firewall.Protocol,
 	sPort *firewall.Port,
 	dPort *firewall.Port,
 	action firewall.Action,
 	ipsetName string,
-	_ string,
 ) ([]firewall.Rule, error) {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	return m.aclMgr.AddPeerFiltering(ip, protocol, sPort, dPort, action, ipsetName)
+	return m.aclMgr.AddPeerFiltering(id, ip, proto, sPort, dPort, action, ipsetName)
 }
 
 func (m *Manager) AddRouteFiltering(
+	id []byte,
 	sources []netip.Prefix,
 	destination netip.Prefix,
 	proto firewall.Protocol,
@@ -125,7 +126,7 @@ func (m *Manager) AddRouteFiltering(
 		return nil, fmt.Errorf("unsupported IP version: %s", destination.Addr().String())
 	}
 
-	return m.router.AddRouteFiltering(sources, destination, proto, sPort, dPort, action)
+	return m.router.AddRouteFiltering(id, sources, destination, proto, sPort, dPort, action)
 }
 
 // DeletePeerRule from the firewall by rule definition
@@ -196,13 +197,13 @@ func (m *Manager) AllowNetbird() error {
 	}
 
 	_, err := m.AddPeerFiltering(
+		nil,
 		net.IP{0, 0, 0, 0},
 		"all",
 		nil,
 		nil,
 		firewall.ActionAccept,
 		"",
-		"",
 	)
 	if err != nil {
 		return fmt.Errorf("allow netbird interface traffic: %w", err)
@@ -226,6 +227,22 @@ func (m *Manager) DisableRouting() error {
 	return nil
 }
 
+// AddDNATRule adds a DNAT rule
+func (m *Manager) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	return m.router.AddDNATRule(rule)
+}
+
+// DeleteDNATRule deletes a DNAT rule
+func (m *Manager) DeleteDNATRule(rule firewall.Rule) error {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	return m.router.DeleteDNATRule(rule)
+}
+
 func getConntrackEstablished() []string {
 	return []string{"-m", "conntrack", "--ctstate", "RELATED,ESTABLISHED", "-j", "ACCEPT"}
 }

client/firewall/iptables/manager_linux_test.go

@@ -10,15 +10,15 @@ import (
 	"github.com/stretchr/testify/require"
 
 	fw "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 var ifaceMock = &iFaceMock{
 	NameFunc: func() string {
 		return "lo"
 	},
-	AddressFunc: func() iface.WGAddress {
+	AddressFunc: func() wgaddr.Address {
-		return iface.WGAddress{
+		return wgaddr.Address{
 			IP: net.ParseIP("10.20.0.1"),
 			Network: &net.IPNet{
 				IP:   net.ParseIP("10.20.0.0"),
@@ -31,7 +31,7 @@ var ifaceMock = &iFaceMock{
 // iFaceMapper defines subset methods of interface required for manager
 type iFaceMock struct {
 	NameFunc    func() string
-	AddressFunc func() iface.WGAddress
+	AddressFunc func() wgaddr.Address
 }
 
 func (i *iFaceMock) Name() string {
@@ -41,7 +41,7 @@ func (i *iFaceMock) Name() string {
 	panic("NameFunc is not set")
 }
 
-func (i *iFaceMock) Address() iface.WGAddress {
+func (i *iFaceMock) Address() wgaddr.Address {
 	if i.AddressFunc != nil {
 		return i.AddressFunc()
 	}
@@ -75,7 +75,7 @@ func TestIptablesManager(t *testing.T) {
 			IsRange: true,
 			Values:  []uint16{8043, 8046},
 		}
-		rule2, err = manager.AddPeerFiltering(ip, "tcp", port, nil, fw.ActionAccept, "", "accept HTTPS traffic from ports range")
+		rule2, err = manager.AddPeerFiltering(nil, ip, "tcp", port, nil, fw.ActionAccept, "")
 		require.NoError(t, err, "failed to add rule")
 
 		for _, r := range rule2 {
@@ -97,7 +97,7 @@ func TestIptablesManager(t *testing.T) {
 		// add second rule
 		ip := net.ParseIP("10.20.0.3")
 		port := &fw.Port{Values: []uint16{5353}}
-		_, err = manager.AddPeerFiltering(ip, "udp", nil, port, fw.ActionAccept, "", "accept Fake DNS traffic")
+		_, err = manager.AddPeerFiltering(nil, ip, "udp", nil, port, fw.ActionAccept, "")
 		require.NoError(t, err, "failed to add rule")
 
 		err = manager.Close(nil)
@@ -117,8 +117,8 @@ func TestIptablesManagerIPSet(t *testing.T) {
 		NameFunc: func() string {
 			return "lo"
 		},
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP: net.ParseIP("10.20.0.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("10.20.0.0"),
@@ -148,7 +148,7 @@ func TestIptablesManagerIPSet(t *testing.T) {
 		port := &fw.Port{
 			Values: []uint16{443},
 		}
-		rule2, err = manager.AddPeerFiltering(ip, "tcp", port, nil, fw.ActionAccept, "default", "accept HTTPS traffic from ports range")
+		rule2, err = manager.AddPeerFiltering(nil, ip, "tcp", port, nil, fw.ActionAccept, "default")
 		for _, r := range rule2 {
 			require.NoError(t, err, "failed to add rule")
 			require.Equal(t, r.(*Rule).ipsetName, "default-sport", "ipset name must be set")
@@ -184,8 +184,8 @@ func TestIptablesCreatePerformance(t *testing.T) {
 		NameFunc: func() string {
 			return "lo"
 		},
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP: net.ParseIP("10.20.0.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("10.20.0.0"),
@@ -216,7 +216,7 @@ func TestIptablesCreatePerformance(t *testing.T) {
 			start := time.Now()
 			for i := 0; i < testMax; i++ {
 				port := &fw.Port{Values: []uint16{uint16(1000 + i)}}
-				_, err = manager.AddPeerFiltering(ip, "tcp", nil, port, fw.ActionAccept, "", "accept HTTP traffic")
+				_, err = manager.AddPeerFiltering(nil, ip, "tcp", nil, port, fw.ActionAccept, "")
 
 				require.NoError(t, err, "failed to add rule")
 			}

client/firewall/iptables/router_linux.go

@@ -15,7 +15,8 @@ import (
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/internal/acl/id"
+	nbid "github.com/netbirdio/netbird/client/internal/acl/id"
+	"github.com/netbirdio/netbird/client/internal/routemanager/ipfwdstate"
 	"github.com/netbirdio/netbird/client/internal/routemanager/refcounter"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 	nbnet "github.com/netbirdio/netbird/util/net"
@@ -26,19 +27,33 @@ const (
 	tableFilter = "filter"
 	tableNat    = "nat"
 	tableMangle = "mangle"
+
 	chainPOSTROUTING        = "POSTROUTING"
 	chainPREROUTING         = "PREROUTING"
 	chainRTNAT              = "NETBIRD-RT-NAT"
-	chainRTFWD              = "NETBIRD-RT-FWD"
+	chainRTFWDIN            = "NETBIRD-RT-FWD-IN"
+	chainRTFWDOUT           = "NETBIRD-RT-FWD-OUT"
 	chainRTPRE              = "NETBIRD-RT-PRE"
+	chainRTRDR              = "NETBIRD-RT-RDR"
 	routingFinalForwardJump = "ACCEPT"
 	routingFinalNatJump     = "MASQUERADE"
 
-	jumpPre  = "jump-pre"
+	jumpManglePre = "jump-mangle-pre"
-	jumpNat  = "jump-nat"
+	jumpNatPre    = "jump-nat-pre"
+	jumpNatPost   = "jump-nat-post"
 	matchSet      = "--match-set"
+
+	dnatSuffix = "_dnat"
+	snatSuffix = "_snat"
+	fwdSuffix  = "_fwd"
 )
 
+type ruleInfo struct {
+	chain string
+	table string
+	rule  []string
+}
+
 type routeFilteringRuleParams struct {
 	Sources     []netip.Prefix
 	Destination netip.Prefix
@@ -62,6 +77,7 @@ type router struct {
 	legacyManagement bool
 
 	stateManager *statemanager.Manager
+	ipFwdState   *ipfwdstate.IPForwardingState
 }
 
 func newRouter(iptablesClient *iptables.IPTables, wgIface iFaceMapper) (*router, error) {
@@ -69,6 +85,7 @@ func newRouter(iptablesClient *iptables.IPTables, wgIface iFaceMapper) (*router,
 		iptablesClient: iptablesClient,
 		rules:          make(map[string][]string),
 		wgIface:        wgIface,
+		ipFwdState:     ipfwdstate.NewIPForwardingState(),
 	}
 
 	r.ipsetCounter = refcounter.New(
@@ -104,6 +121,7 @@ func (r *router) init(stateManager *statemanager.Manager) error {
 }
 
 func (r *router) AddRouteFiltering(
+	id []byte,
 	sources []netip.Prefix,
 	destination netip.Prefix,
 	proto firewall.Protocol,
@@ -111,7 +129,7 @@ func (r *router) AddRouteFiltering(
 	dPort *firewall.Port,
 	action firewall.Action,
 ) (firewall.Rule, error) {
-	ruleKey := id.GenerateRouteRuleKey(sources, destination, proto, sPort, dPort, action)
+	ruleKey := nbid.GenerateRouteRuleKey(sources, destination, proto, sPort, dPort, action)
 	if _, ok := r.rules[string(ruleKey)]; ok {
 		return ruleKey, nil
 	}
@@ -139,9 +157,9 @@ func (r *router) AddRouteFiltering(
 	var err error
 	if action == firewall.ActionDrop {
 		// after the established rule
-		err = r.iptablesClient.Insert(tableFilter, chainRTFWD, 2, rule...)
+		err = r.iptablesClient.Insert(tableFilter, chainRTFWDIN, 2, rule...)
 	} else {
-		err = r.iptablesClient.Append(tableFilter, chainRTFWD, rule...)
+		err = r.iptablesClient.Append(tableFilter, chainRTFWDIN, rule...)
 	}
 
 	if err != nil {
@@ -156,12 +174,12 @@ func (r *router) AddRouteFiltering(
 }
 
 func (r *router) DeleteRouteRule(rule firewall.Rule) error {
-	ruleKey := rule.GetRuleID()
+	ruleKey := rule.ID()
 
 	if rule, exists := r.rules[ruleKey]; exists {
 		setName := r.findSetNameInRule(rule)
 
-		if err := r.iptablesClient.Delete(tableFilter, chainRTFWD, rule...); err != nil {
+		if err := r.iptablesClient.Delete(tableFilter, chainRTFWDIN, rule...); err != nil {
 			return fmt.Errorf("delete route rule: %v", err)
 		}
 		delete(r.rules, ruleKey)
@@ -212,6 +230,10 @@ func (r *router) deleteIpSet(setName string) error {
 
 // AddNatRule inserts an iptables rule pair into the nat chain
 func (r *router) AddNatRule(pair firewall.RouterPair) error {
+	if err := r.ipFwdState.RequestForwarding(); err != nil {
+		return err
+	}
+
 	if r.legacyManagement {
 		log.Warnf("This peer is connected to a NetBird Management service with an older version. Allowing all traffic for %s", pair.Destination)
 		if err := r.addLegacyRouteRule(pair); err != nil {
@@ -238,6 +260,10 @@ func (r *router) AddNatRule(pair firewall.RouterPair) error {
 
 // RemoveNatRule removes an iptables rule pair from forwarding and nat chains
 func (r *router) RemoveNatRule(pair firewall.RouterPair) error {
+	if err := r.ipFwdState.ReleaseForwarding(); err != nil {
+		log.Errorf("%v", err)
+	}
+
 	if err := r.removeNatRule(pair); err != nil {
 		return fmt.Errorf("remove nat rule: %w", err)
 	}
@@ -264,7 +290,7 @@ func (r *router) addLegacyRouteRule(pair firewall.RouterPair) error {
 	}
 
 	rule := []string{"-s", pair.Source.String(), "-d", pair.Destination.String(), "-j", routingFinalForwardJump}
-	if err := r.iptablesClient.Append(tableFilter, chainRTFWD, rule...); err != nil {
+	if err := r.iptablesClient.Append(tableFilter, chainRTFWDIN, rule...); err != nil {
 		return fmt.Errorf("add legacy forwarding rule %s -> %s: %v", pair.Source, pair.Destination, err)
 	}
 
@@ -277,7 +303,7 @@ func (r *router) removeLegacyRouteRule(pair firewall.RouterPair) error {
 	ruleKey := firewall.GenKey(firewall.ForwardingFormat, pair)
 
 	if rule, exists := r.rules[ruleKey]; exists {
-		if err := r.iptablesClient.DeleteIfExists(tableFilter, chainRTFWD, rule...); err != nil {
+		if err := r.iptablesClient.DeleteIfExists(tableFilter, chainRTFWDIN, rule...); err != nil {
 			return fmt.Errorf("remove legacy forwarding rule %s -> %s: %v", pair.Source, pair.Destination, err)
 		}
 		delete(r.rules, ruleKey)
@@ -305,7 +331,7 @@ func (r *router) RemoveAllLegacyRouteRules() error {
 		if !strings.HasPrefix(k, firewall.ForwardingFormatPrefix) {
 			continue
 		}
-		if err := r.iptablesClient.DeleteIfExists(tableFilter, chainRTFWD, rule...); err != nil {
+		if err := r.iptablesClient.DeleteIfExists(tableFilter, chainRTFWDIN, rule...); err != nil {
 			merr = multierror.Append(merr, fmt.Errorf("remove legacy forwarding rule: %v", err))
 		} else {
 			delete(r.rules, k)
@@ -343,9 +369,11 @@ func (r *router) cleanUpDefaultForwardRules() error {
 		chain string
 		table string
 	}{
-		{chainRTFWD, tableFilter},
+		{chainRTFWDIN, tableFilter},
-		{chainRTNAT, tableNat},
+		{chainRTFWDOUT, tableFilter},
 		{chainRTPRE, tableMangle},
+		{chainRTNAT, tableNat},
+		{chainRTRDR, tableNat},
 	} {
 		ok, err := r.iptablesClient.ChainExists(chainInfo.table, chainInfo.chain)
 		if err != nil {
@@ -365,16 +393,22 @@ func (r *router) createContainers() error {
 		chain string
 		table string
 	}{
-		{chainRTFWD, tableFilter},
+		{chainRTFWDIN, tableFilter},
+		{chainRTFWDOUT, tableFilter},
 		{chainRTPRE, tableMangle},
 		{chainRTNAT, tableNat},
+		{chainRTRDR, tableNat},
 	} {
-		if err := r.createAndSetupChain(chainInfo.chain); err != nil {
+		if err := r.iptablesClient.NewChain(chainInfo.table, chainInfo.chain); err != nil {
 			return fmt.Errorf("create chain %s in table %s: %w", chainInfo.chain, chainInfo.table, err)
 		}
 	}
 
-	if err := r.insertEstablishedRule(chainRTFWD); err != nil {
+	if err := r.insertEstablishedRule(chainRTFWDIN); err != nil {
+		return fmt.Errorf("insert established rule: %w", err)
+	}
+
+	if err := r.insertEstablishedRule(chainRTFWDOUT); err != nil {
 		return fmt.Errorf("insert established rule: %w", err)
 	}
 
@@ -415,27 +449,6 @@ func (r *router) addPostroutingRules() error {
 	return nil
 }
 
-func (r *router) createAndSetupChain(chain string) error {
-	table := r.getTableForChain(chain)
-
-	if err := r.iptablesClient.NewChain(table, chain); err != nil {
-		return fmt.Errorf("failed creating chain %s, error: %v", chain, err)
-	}
-
-	return nil
-}
-
-func (r *router) getTableForChain(chain string) string {
-	switch chain {
-	case chainRTNAT:
-		return tableNat
-	case chainRTPRE:
-		return tableMangle
-	default:
-		return tableFilter
-	}
-}
-
 func (r *router) insertEstablishedRule(chain string) error {
 	establishedRule := getConntrackEstablished()
 
@@ -454,28 +467,43 @@ func (r *router) addJumpRules() error {
 	// Jump to NAT chain
 	natRule := []string{"-j", chainRTNAT}
 	if err := r.iptablesClient.Insert(tableNat, chainPOSTROUTING, 1, natRule...); err != nil {
-		return fmt.Errorf("add nat jump rule: %v", err)
+		return fmt.Errorf("add nat postrouting jump rule: %v", err)
 	}
-	r.rules[jumpNat] = natRule
+	r.rules[jumpNatPost] = natRule
 
-	// Jump to prerouting chain
+	// Jump to mangle prerouting chain
 	preRule := []string{"-j", chainRTPRE}
 	if err := r.iptablesClient.Insert(tableMangle, chainPREROUTING, 1, preRule...); err != nil {
-		return fmt.Errorf("add prerouting jump rule: %v", err)
+		return fmt.Errorf("add mangle prerouting jump rule: %v", err)
 	}
-	r.rules[jumpPre] = preRule
+	r.rules[jumpManglePre] = preRule
+
+	// Jump to nat prerouting chain
+	rdrRule := []string{"-j", chainRTRDR}
+	if err := r.iptablesClient.Insert(tableNat, chainPREROUTING, 1, rdrRule...); err != nil {
+		return fmt.Errorf("add nat prerouting jump rule: %v", err)
+	}
+	r.rules[jumpNatPre] = rdrRule
 
 	return nil
 }
 
 func (r *router) cleanJumpRules() error {
-	for _, ruleKey := range []string{jumpNat, jumpPre} {
+	for _, ruleKey := range []string{jumpNatPost, jumpManglePre, jumpNatPre} {
 		if rule, exists := r.rules[ruleKey]; exists {
-			table := tableNat
+			var table, chain string
-			chain := chainPOSTROUTING
+			switch ruleKey {
-			if ruleKey == jumpPre {
+			case jumpNatPost:
+				table = tableNat
+				chain = chainPOSTROUTING
+			case jumpManglePre:
 				table = tableMangle
 				chain = chainPREROUTING
+			case jumpNatPre:
+				table = tableNat
+				chain = chainPREROUTING
+			default:
+				return fmt.Errorf("unknown jump rule: %s", ruleKey)
 			}
 
 			if err := r.iptablesClient.DeleteIfExists(table, chain, rule...); err != nil {
@@ -520,6 +548,8 @@ func (r *router) addNatRule(pair firewall.RouterPair) error {
 	}
 
 	r.rules[ruleKey] = rule
+
+	r.updateState()
 	return nil
 }
 
@@ -535,6 +565,7 @@ func (r *router) removeNatRule(pair firewall.RouterPair) error {
 		log.Debugf("marking rule %s not found", ruleKey)
 	}
 
+	r.updateState()
 	return nil
 }
 
@@ -564,6 +595,137 @@ func (r *router) updateState() {
 	}
 }
 
+func (r *router) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
+	if err := r.ipFwdState.RequestForwarding(); err != nil {
+		return nil, err
+	}
+
+	ruleKey := rule.ID()
+	if _, exists := r.rules[ruleKey+dnatSuffix]; exists {
+		return rule, nil
+	}
+
+	toDestination := rule.TranslatedAddress.String()
+	switch {
+	case len(rule.TranslatedPort.Values) == 0:
+		// no translated port, use original port
+	case len(rule.TranslatedPort.Values) == 1:
+		toDestination += fmt.Sprintf(":%d", rule.TranslatedPort.Values[0])
+	case rule.TranslatedPort.IsRange && len(rule.TranslatedPort.Values) == 2:
+		// need the "/originalport" suffix to avoid dnat port randomization
+		toDestination += fmt.Sprintf(":%d-%d/%d", rule.TranslatedPort.Values[0], rule.TranslatedPort.Values[1], rule.DestinationPort.Values[0])
+	default:
+		return nil, fmt.Errorf("invalid translated port: %v", rule.TranslatedPort)
+	}
+
+	proto := strings.ToLower(string(rule.Protocol))
+
+	rules := make(map[string]ruleInfo, 3)
+
+	// DNAT rule
+	dnatRule := []string{
+		"!", "-i", r.wgIface.Name(),
+		"-p", proto,
+		"-j", "DNAT",
+		"--to-destination", toDestination,
+	}
+	dnatRule = append(dnatRule, applyPort("--dport", &rule.DestinationPort)...)
+	rules[ruleKey+dnatSuffix] = ruleInfo{
+		table: tableNat,
+		chain: chainRTRDR,
+		rule:  dnatRule,
+	}
+
+	// SNAT rule
+	snatRule := []string{
+		"-o", r.wgIface.Name(),
+		"-p", proto,
+		"-d", rule.TranslatedAddress.String(),
+		"-j", "MASQUERADE",
+	}
+	snatRule = append(snatRule, applyPort("--dport", &rule.TranslatedPort)...)
+	rules[ruleKey+snatSuffix] = ruleInfo{
+		table: tableNat,
+		chain: chainRTNAT,
+		rule:  snatRule,
+	}
+
+	// Forward filtering rule, if fwd policy is DROP
+	forwardRule := []string{
+		"-o", r.wgIface.Name(),
+		"-p", proto,
+		"-d", rule.TranslatedAddress.String(),
+		"-j", "ACCEPT",
+	}
+	forwardRule = append(forwardRule, applyPort("--dport", &rule.TranslatedPort)...)
+	rules[ruleKey+fwdSuffix] = ruleInfo{
+		table: tableFilter,
+		chain: chainRTFWDOUT,
+		rule:  forwardRule,
+	}
+
+	for key, ruleInfo := range rules {
+		if err := r.iptablesClient.Append(ruleInfo.table, ruleInfo.chain, ruleInfo.rule...); err != nil {
+			if rollbackErr := r.rollbackRules(rules); rollbackErr != nil {
+				log.Errorf("rollback failed: %v", rollbackErr)
+			}
+			return nil, fmt.Errorf("add rule %s: %w", key, err)
+		}
+		r.rules[key] = ruleInfo.rule
+	}
+
+	r.updateState()
+	return rule, nil
+}
+
+func (r *router) rollbackRules(rules map[string]ruleInfo) error {
+	var merr *multierror.Error
+	for key, ruleInfo := range rules {
+		if err := r.iptablesClient.DeleteIfExists(ruleInfo.table, ruleInfo.chain, ruleInfo.rule...); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("rollback rule %s: %w", key, err))
+			// On rollback error, add to rules map for next cleanup
+			r.rules[key] = ruleInfo.rule
+		}
+	}
+	if merr != nil {
+		r.updateState()
+	}
+	return nberrors.FormatErrorOrNil(merr)
+}
+
+func (r *router) DeleteDNATRule(rule firewall.Rule) error {
+	if err := r.ipFwdState.ReleaseForwarding(); err != nil {
+		log.Errorf("%v", err)
+	}
+
+	ruleKey := rule.ID()
+
+	var merr *multierror.Error
+	if dnatRule, exists := r.rules[ruleKey+dnatSuffix]; exists {
+		if err := r.iptablesClient.Delete(tableNat, chainRTRDR, dnatRule...); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete DNAT rule: %w", err))
+		}
+		delete(r.rules, ruleKey+dnatSuffix)
+	}
+
+	if snatRule, exists := r.rules[ruleKey+snatSuffix]; exists {
+		if err := r.iptablesClient.Delete(tableNat, chainRTNAT, snatRule...); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete SNAT rule: %w", err))
+		}
+		delete(r.rules, ruleKey+snatSuffix)
+	}
+
+	if fwdRule, exists := r.rules[ruleKey+fwdSuffix]; exists {
+		if err := r.iptablesClient.Delete(tableFilter, chainRTFWDIN, fwdRule...); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete forward rule: %w", err))
+		}
+		delete(r.rules, ruleKey+fwdSuffix)
+	}
+
+	r.updateState()
+	return nberrors.FormatErrorOrNil(merr)
+}
+
 func genRouteFilteringRuleSpec(params routeFilteringRuleParams) []string {
 	var rule []string
 

client/firewall/iptables/router_linux_test.go

@@ -39,12 +39,14 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
 	}()
 
 	// Now 5 rules:
-	// 1. established rule in forward chain
+	// 1. established rule forward in
-	// 2. jump rule to NAT chain
+	// 2. estbalished rule forward out
-	// 3. jump rule to PRE chain
+	// 3. jump rule to POST nat chain
-	// 4. static outbound masquerade rule
+	// 4. jump rule to PRE mangle chain
-	// 5. static return masquerade rule
+	// 5. jump rule to PRE nat chain
-	require.Len(t, manager.rules, 5, "should have created rules map")
+	// 6. static outbound masquerade rule
+	// 7. static return masquerade rule
+	require.Len(t, manager.rules, 7, "should have created rules map")
 
 	exists, err := manager.iptablesClient.Exists(tableNat, chainPOSTROUTING, "-j", chainRTNAT)
 	require.NoError(t, err, "should be able to query the iptables %s table and %s chain", tableNat, chainPOSTROUTING)
@@ -328,18 +330,18 @@ func TestRouter_AddRouteFiltering(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			ruleKey, err := r.AddRouteFiltering(tt.sources, tt.destination, tt.proto, tt.sPort, tt.dPort, tt.action)
+			ruleKey, err := r.AddRouteFiltering(nil, tt.sources, tt.destination, tt.proto, tt.sPort, tt.dPort, tt.action)
 			require.NoError(t, err, "AddRouteFiltering failed")
 
 			// Check if the rule is in the internal map
-			rule, ok := r.rules[ruleKey.GetRuleID()]
+			rule, ok := r.rules[ruleKey.ID()]
 			assert.True(t, ok, "Rule not found in internal map")
 
 			// Log the internal rule
 			t.Logf("Internal rule: %v", rule)
 
 			// Check if the rule exists in iptables
-			exists, err := iptablesClient.Exists(tableFilter, chainRTFWD, rule...)
+			exists, err := iptablesClient.Exists(tableFilter, chainRTFWDIN, rule...)
 			assert.NoError(t, err, "Failed to check rule existence")
 			assert.True(t, exists, "Rule not found in iptables")
 

client/firewall/iptables/rule.go

@@ -12,6 +12,6 @@ type Rule struct {
 }
 
 // GetRuleID returns the rule id
-func (r *Rule) GetRuleID() string {
+func (r *Rule) ID() string {
 	return r.ruleID
 }

client/firewall/iptables/state_linux.go

@@ -4,13 +4,12 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
-	"github.com/netbirdio/netbird/client/iface/device"
 )
 
 type InterfaceState struct {
 	NameStr       string         `json:"name"`
-	WGAddress     iface.WGAddress `json:"wg_address"`
+	WGAddress     wgaddr.Address `json:"wg_address"`
 	UserspaceBind bool           `json:"userspace_bind"`
 }
 
@@ -18,7 +17,7 @@ func (i *InterfaceState) Name() string {
 	return i.NameStr
 }
 
-func (i *InterfaceState) Address() device.WGAddress {
+func (i *InterfaceState) Address() wgaddr.Address {
 	return i.WGAddress
 }
 

client/firewall/manager/firewall.go

@@ -26,8 +26,8 @@ const (
 // Each firewall type for different OS can use different type
 // of the properties to hold data of the created rule
 type Rule interface {
-	// GetRuleID returns the rule id
+	// ID returns the rule id
-	GetRuleID() string
+	ID() string
 }
 
 // RuleDirection is the traffic direction which a rule is applied
@@ -65,13 +65,13 @@ type Manager interface {
 	// If comment argument is empty firewall manager should set
 	// rule ID as comment for the rule
 	AddPeerFiltering(
+		id []byte,
 		ip net.IP,
 		proto Protocol,
 		sPort *Port,
 		dPort *Port,
 		action Action,
 		ipsetName string,
-		comment string,
 	) ([]Rule, error)
 
 	// DeletePeerRule from the firewall by rule definition
@@ -80,7 +80,15 @@ type Manager interface {
 	// IsServerRouteSupported returns true if the firewall supports server side routing operations
 	IsServerRouteSupported() bool
 
-	AddRouteFiltering(source []netip.Prefix, destination netip.Prefix, proto Protocol, sPort *Port, dPort *Port, action Action) (Rule, error)
+	AddRouteFiltering(
+		id []byte,
+		sources []netip.Prefix,
+		destination netip.Prefix,
+		proto Protocol,
+		sPort *Port,
+		dPort *Port,
+		action Action,
+	) (Rule, error)
 
 	// DeleteRouteRule deletes a routing rule
 	DeleteRouteRule(rule Rule) error
@@ -105,6 +113,12 @@ type Manager interface {
 	EnableRouting() error
 
 	DisableRouting() error
+
+	// AddDNATRule adds a DNAT rule
+	AddDNATRule(ForwardRule) (Rule, error)
+
+	// DeleteDNATRule deletes a DNAT rule
+	DeleteDNATRule(Rule) error
 }
 
 func GenKey(format string, pair RouterPair) string {

client/firewall/manager/forward_rule.go

@@ -0,0 +1,27 @@
+package manager
+
+import (
+	"fmt"
+	"net/netip"
+)
+
+// ForwardRule todo figure out better place to this to avoid circular imports
+type ForwardRule struct {
+	Protocol          Protocol
+	DestinationPort   Port
+	TranslatedAddress netip.Addr
+	TranslatedPort    Port
+}
+
+func (r ForwardRule) ID() string {
+	id := fmt.Sprintf("%s;%s;%s;%s",
+		r.Protocol,
+		r.DestinationPort.String(),
+		r.TranslatedAddress.String(),
+		r.TranslatedPort.String())
+	return id
+}
+
+func (r ForwardRule) String() string {
+	return fmt.Sprintf("protocol: %s, destinationPort: %s, translatedAddress: %s, translatedPort: %s", r.Protocol, r.DestinationPort.String(), r.TranslatedAddress.String(), r.TranslatedPort.String())
+}

client/firewall/manager/port.go

@@ -1,30 +1,12 @@
 package manager
 
 import (
+	"fmt"
 	"strconv"
 )
 
-// Protocol is the protocol of the port
-type Protocol string
-
-const (
-	// ProtocolTCP is the TCP protocol
-	ProtocolTCP Protocol = "tcp"
-
-	// ProtocolUDP is the UDP protocol
-	ProtocolUDP Protocol = "udp"
-
-	// ProtocolICMP is the ICMP protocol
-	ProtocolICMP Protocol = "icmp"
-
-	// ProtocolALL cover all supported protocols
-	ProtocolALL Protocol = "all"
-
-	// ProtocolUnknown unknown protocol
-	ProtocolUnknown Protocol = "unknown"
-)
-
 // Port of the address for firewall rule
+// todo Move Protocol and Port and RouterPair to the Firwall package or a separate package
 type Port struct {
 	// IsRange is true Values contains two values, the first is the start port, the second is the end port
 	IsRange bool
@@ -33,6 +15,25 @@ type Port struct {
 	Values []uint16
 }
 
+func NewPort(ports ...int) (*Port, error) {
+	if len(ports) == 0 {
+		return nil, fmt.Errorf("no port provided")
+	}
+
+	ports16 := make([]uint16, len(ports))
+	for i, port := range ports {
+		if port < 1 || port > 65535 {
+			return nil, fmt.Errorf("invalid port number: %d (must be between 1-65535)", port)
+		}
+		ports16[i] = uint16(port)
+	}
+
+	return &Port{
+		IsRange: len(ports) > 1,
+		Values:  ports16,
+	}, nil
+}
+
 // String interface implementation
 func (p *Port) String() string {
 	var ports string

client/firewall/manager/protocol.go

@@ -0,0 +1,19 @@
+package manager
+
+// Protocol is the protocol of the port
+// todo Move Protocol and Port and RouterPair to the Firwall package or a separate package
+type Protocol string
+
+const (
+	// ProtocolTCP is the TCP protocol
+	ProtocolTCP Protocol = "tcp"
+
+	// ProtocolUDP is the UDP protocol
+	ProtocolUDP Protocol = "udp"
+
+	// ProtocolICMP is the ICMP protocol
+	ProtocolICMP Protocol = "icmp"
+
+	// ProtocolALL cover all supported protocols
+	ProtocolALL Protocol = "all"
+)

client/firewall/nftables/acl_linux.go

@@ -84,13 +84,13 @@ func (m *AclManager) init(workTable *nftables.Table) error {
 // If comment argument is empty firewall manager should set
 // rule ID as comment for the rule
 func (m *AclManager) AddPeerFiltering(
+	id []byte,
 	ip net.IP,
 	proto firewall.Protocol,
 	sPort *firewall.Port,
 	dPort *firewall.Port,
 	action firewall.Action,
 	ipsetName string,
-	comment string,
 ) ([]firewall.Rule, error) {
 	var ipset *nftables.Set
 	if ipsetName != "" {
@@ -102,7 +102,7 @@ func (m *AclManager) AddPeerFiltering(
 	}
 
 	newRules := make([]firewall.Rule, 0, 2)
-	ioRule, err := m.addIOFiltering(ip, proto, sPort, dPort, action, ipset, comment)
+	ioRule, err := m.addIOFiltering(ip, proto, sPort, dPort, action, ipset)
 	if err != nil {
 		return nil, err
 	}
@@ -127,7 +127,7 @@ func (m *AclManager) DeletePeerRule(rule firewall.Rule) error {
 				log.Errorf("failed to delete mangle rule: %v", err)
 			}
 		}
-		delete(m.rules, r.GetRuleID())
+		delete(m.rules, r.ID())
 		return m.rConn.Flush()
 	}
 
@@ -141,7 +141,7 @@ func (m *AclManager) DeletePeerRule(rule firewall.Rule) error {
 				log.Errorf("failed to delete mangle rule: %v", err)
 			}
 		}
-		delete(m.rules, r.GetRuleID())
+		delete(m.rules, r.ID())
 		return m.rConn.Flush()
 	}
 
@@ -176,7 +176,7 @@ func (m *AclManager) DeletePeerRule(rule firewall.Rule) error {
 		return err
 	}
 
-	delete(m.rules, r.GetRuleID())
+	delete(m.rules, r.ID())
 	m.ipsetStore.DeleteReferenceFromIpSet(r.nftSet.Name)
 
 	if m.ipsetStore.HasReferenceToSet(r.nftSet.Name) {
@@ -256,7 +256,6 @@ func (m *AclManager) addIOFiltering(
 	dPort *firewall.Port,
 	action firewall.Action,
 	ipset *nftables.Set,
-	comment string,
 ) (*Rule, error) {
 	ruleId := generatePeerRuleId(ip, sPort, dPort, action, ipset)
 	if r, ok := m.rules[ruleId]; ok {
@@ -338,7 +337,7 @@ func (m *AclManager) addIOFiltering(
 		mainExpressions = append(mainExpressions, &expr.Verdict{Kind: expr.VerdictDrop})
 	}
 
-	userData := []byte(strings.Join([]string{ruleId, comment}, " "))
+	userData := []byte(ruleId)
 
 	chain := m.chainInputRules
 	nftRule := m.rConn.AddRule(&nftables.Rule{

client/firewall/nftables/manager_linux.go

@@ -14,7 +14,7 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
@@ -29,7 +29,7 @@ const (
 // iFaceMapper defines subset methods of interface required for manager
 type iFaceMapper interface {
 	Name() string
-	Address() iface.WGAddress
+	Address() wgaddr.Address
 	IsUserspaceBind() bool
 }
 
@@ -113,13 +113,13 @@ func (m *Manager) Init(stateManager *statemanager.Manager) error {
 // If comment argument is empty firewall manager should set
 // rule ID as comment for the rule
 func (m *Manager) AddPeerFiltering(
+	id []byte,
 	ip net.IP,
 	proto firewall.Protocol,
 	sPort *firewall.Port,
 	dPort *firewall.Port,
 	action firewall.Action,
 	ipsetName string,
-	comment string,
 ) ([]firewall.Rule, error) {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
@@ -129,10 +129,11 @@ func (m *Manager) AddPeerFiltering(
 		return nil, fmt.Errorf("unsupported IP version: %s", ip.String())
 	}
 
-	return m.aclManager.AddPeerFiltering(ip, proto, sPort, dPort, action, ipsetName, comment)
+	return m.aclManager.AddPeerFiltering(id, ip, proto, sPort, dPort, action, ipsetName)
 }
 
 func (m *Manager) AddRouteFiltering(
+	id []byte,
 	sources []netip.Prefix,
 	destination netip.Prefix,
 	proto firewall.Protocol,
@@ -147,7 +148,7 @@ func (m *Manager) AddRouteFiltering(
 		return nil, fmt.Errorf("unsupported IP version: %s", destination.Addr().String())
 	}
 
-	return m.router.AddRouteFiltering(sources, destination, proto, sPort, dPort, action)
+	return m.router.AddRouteFiltering(id, sources, destination, proto, sPort, dPort, action)
 }
 
 // DeletePeerRule from the firewall by rule definition
@@ -342,6 +343,22 @@ func (m *Manager) Flush() error {
 	return m.aclManager.Flush()
 }
 
+// AddDNATRule adds a DNAT rule
+func (m *Manager) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	return m.router.AddDNATRule(rule)
+}
+
+// DeleteDNATRule deletes a DNAT rule
+func (m *Manager) DeleteDNATRule(rule firewall.Rule) error {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	return m.router.DeleteDNATRule(rule)
+}
+
 func (m *Manager) createWorkTable() (*nftables.Table, error) {
 	tables, err := m.rConn.ListTablesOfFamily(nftables.TableFamilyIPv4)
 	if err != nil {

client/firewall/nftables/manager_linux_test.go

@@ -16,15 +16,15 @@ import (
 	"golang.org/x/sys/unix"
 
 	fw "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 var ifaceMock = &iFaceMock{
 	NameFunc: func() string {
 		return "lo"
 	},
-	AddressFunc: func() iface.WGAddress {
+	AddressFunc: func() wgaddr.Address {
-		return iface.WGAddress{
+		return wgaddr.Address{
 			IP: net.ParseIP("100.96.0.1"),
 			Network: &net.IPNet{
 				IP:   net.ParseIP("100.96.0.0"),
@@ -37,7 +37,7 @@ var ifaceMock = &iFaceMock{
 // iFaceMapper defines subset methods of interface required for manager
 type iFaceMock struct {
 	NameFunc    func() string
-	AddressFunc func() iface.WGAddress
+	AddressFunc func() wgaddr.Address
 }
 
 func (i *iFaceMock) Name() string {
@@ -47,7 +47,7 @@ func (i *iFaceMock) Name() string {
 	panic("NameFunc is not set")
 }
 
-func (i *iFaceMock) Address() iface.WGAddress {
+func (i *iFaceMock) Address() wgaddr.Address {
 	if i.AddressFunc != nil {
 		return i.AddressFunc()
 	}
@@ -74,7 +74,7 @@ func TestNftablesManager(t *testing.T) {
 
 	testClient := &nftables.Conn{}
 
-	rule, err := manager.AddPeerFiltering(ip, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{53}}, fw.ActionDrop, "", "")
+	rule, err := manager.AddPeerFiltering(nil, ip, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{53}}, fw.ActionDrop, "")
 	require.NoError(t, err, "failed to add rule")
 
 	err = manager.Flush()
@@ -171,8 +171,8 @@ func TestNFtablesCreatePerformance(t *testing.T) {
 		NameFunc: func() string {
 			return "lo"
 		},
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP: net.ParseIP("100.96.0.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("100.96.0.0"),
@@ -201,7 +201,7 @@ func TestNFtablesCreatePerformance(t *testing.T) {
 			start := time.Now()
 			for i := 0; i < testMax; i++ {
 				port := &fw.Port{Values: []uint16{uint16(1000 + i)}}
-				_, err = manager.AddPeerFiltering(ip, "tcp", nil, port, fw.ActionAccept, "", "accept HTTP traffic")
+				_, err = manager.AddPeerFiltering(nil, ip, "tcp", nil, port, fw.ActionAccept, "")
 				require.NoError(t, err, "failed to add rule")
 
 				if i%100 == 0 {
@@ -283,10 +283,11 @@ func TestNftablesManagerCompatibilityWithIptables(t *testing.T) {
 	})
 
 	ip := net.ParseIP("100.96.0.1")
-	_, err = manager.AddPeerFiltering(ip, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{80}}, fw.ActionAccept, "", "test rule")
+	_, err = manager.AddPeerFiltering(nil, ip, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{80}}, fw.ActionAccept, "")
 	require.NoError(t, err, "failed to add peer filtering rule")
 
 	_, err = manager.AddRouteFiltering(
+		nil,
 		[]netip.Prefix{netip.MustParsePrefix("192.168.2.0/24")},
 		netip.MustParsePrefix("10.1.0.0/24"),
 		fw.ProtocolTCP,

client/firewall/nftables/router_linux.go

@@ -14,23 +14,31 @@ import (
 	"github.com/google/nftables"
 	"github.com/google/nftables/binaryutil"
 	"github.com/google/nftables/expr"
+	"github.com/google/nftables/xt"
 	"github.com/hashicorp/go-multierror"
 	log "github.com/sirupsen/logrus"
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/internal/acl/id"
+	nbid "github.com/netbirdio/netbird/client/internal/acl/id"
+	"github.com/netbirdio/netbird/client/internal/routemanager/ipfwdstate"
 	"github.com/netbirdio/netbird/client/internal/routemanager/refcounter"
 	nbnet "github.com/netbirdio/netbird/util/net"
 )
 
 const (
+	tableNat               = "nat"
+	chainNameNatPrerouting = "PREROUTING"
 	chainNameRoutingFw     = "netbird-rt-fwd"
 	chainNameRoutingNat    = "netbird-rt-postrouting"
+	chainNameRoutingRdr    = "netbird-rt-redirect"
 	chainNameForward       = "FORWARD"
 
 	userDataAcceptForwardRuleIif = "frwacceptiif"
 	userDataAcceptForwardRuleOif = "frwacceptoif"
+
+	dnatSuffix = "_dnat"
+	snatSuffix = "_snat"
 )
 
 const refreshRulesMapError = "refresh rules map: %w"
@@ -49,6 +57,7 @@ type router struct {
 	ipsetCounter *refcounter.Counter[string, []netip.Prefix, *nftables.Set]
 
 	wgIface          iFaceMapper
+	ipFwdState       *ipfwdstate.IPForwardingState
 	legacyManagement bool
 }
 
@@ -59,6 +68,7 @@ func newRouter(workTable *nftables.Table, wgIface iFaceMapper) (*router, error)
 		chains:     make(map[string]*nftables.Chain),
 		rules:      make(map[string]*nftables.Rule),
 		wgIface:    wgIface,
+		ipFwdState: ipfwdstate.NewIPForwardingState(),
 	}
 
 	r.ipsetCounter = refcounter.New(
@@ -98,7 +108,52 @@ func (r *router) Reset() error {
 	// clear without deleting the ipsets, the nf table will be deleted by the caller
 	r.ipsetCounter.Clear()
 
-	return r.removeAcceptForwardRules()
+	var merr *multierror.Error
+
+	if err := r.removeAcceptForwardRules(); err != nil {
+		merr = multierror.Append(merr, fmt.Errorf("remove accept forward rules: %w", err))
+	}
+
+	if err := r.removeNatPreroutingRules(); err != nil {
+		merr = multierror.Append(merr, fmt.Errorf("remove filter prerouting rules: %w", err))
+	}
+
+	return nberrors.FormatErrorOrNil(merr)
+}
+
+func (r *router) removeNatPreroutingRules() error {
+	table := &nftables.Table{
+		Name:   tableNat,
+		Family: nftables.TableFamilyIPv4,
+	}
+	chain := &nftables.Chain{
+		Name:     chainNameNatPrerouting,
+		Table:    table,
+		Hooknum:  nftables.ChainHookPrerouting,
+		Priority: nftables.ChainPriorityNATDest,
+		Type:     nftables.ChainTypeNAT,
+	}
+	rules, err := r.conn.GetRules(table, chain)
+	if err != nil {
+		return fmt.Errorf("get rules from nat table: %w", err)
+	}
+
+	var merr *multierror.Error
+
+	// Delete rules that have our UserData suffix
+	for _, rule := range rules {
+		if len(rule.UserData) == 0 || !strings.HasSuffix(string(rule.UserData), dnatSuffix) {
+			continue
+		}
+		if err := r.conn.DelRule(rule); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete rule %s: %w", rule.UserData, err))
+		}
+	}
+
+	if err := r.conn.Flush(); err != nil {
+		merr = multierror.Append(merr, fmt.Errorf(flushError, err))
+	}
+	return nberrors.FormatErrorOrNil(merr)
 }
 
 func (r *router) loadFilterTable() (*nftables.Table, error) {
@@ -133,14 +188,22 @@ func (r *router) createContainers() error {
 		Type:     nftables.ChainTypeNAT,
 	})
 
+	r.chains[chainNameRoutingRdr] = r.conn.AddChain(&nftables.Chain{
+		Name:     chainNameRoutingRdr,
+		Table:    r.workTable,
+		Hooknum:  nftables.ChainHookPrerouting,
+		Priority: nftables.ChainPriorityNATDest,
+		Type:     nftables.ChainTypeNAT,
+	})
+
 	// Chain is created by acl manager
 	// TODO: move creation to a common place
 	r.chains[chainNamePrerouting] = &nftables.Chain{
 		Name:     chainNamePrerouting,
 		Table:    r.workTable,
-		Type:     nftables.ChainTypeFilter,
 		Hooknum:  nftables.ChainHookPrerouting,
 		Priority: nftables.ChainPriorityMangle,
+		Type:     nftables.ChainTypeFilter,
 	}
 
 	// Add the single NAT rule that matches on mark
@@ -165,6 +228,7 @@ func (r *router) createContainers() error {
 
 // AddRouteFiltering appends a nftables rule to the routing chain
 func (r *router) AddRouteFiltering(
+	id []byte,
 	sources []netip.Prefix,
 	destination netip.Prefix,
 	proto firewall.Protocol,
@@ -173,7 +237,7 @@ func (r *router) AddRouteFiltering(
 	action firewall.Action,
 ) (firewall.Rule, error) {
 
-	ruleKey := id.GenerateRouteRuleKey(sources, destination, proto, sPort, dPort, action)
+	ruleKey := nbid.GenerateRouteRuleKey(sources, destination, proto, sPort, dPort, action)
 	if _, ok := r.rules[string(ruleKey)]; ok {
 		return ruleKey, nil
 	}
@@ -281,7 +345,7 @@ func (r *router) DeleteRouteRule(rule firewall.Rule) error {
 		return fmt.Errorf(refreshRulesMapError, err)
 	}
 
-	ruleKey := rule.GetRuleID()
+	ruleKey := rule.ID()
 	nftRule, exists := r.rules[ruleKey]
 	if !exists {
 		log.Debugf("route rule %s not found", ruleKey)
@@ -410,6 +474,10 @@ func (r *router) deleteNftRule(rule *nftables.Rule, ruleKey string) error {
 
 // AddNatRule appends a nftables rule pair to the nat chain
 func (r *router) AddNatRule(pair firewall.RouterPair) error {
+	if err := r.ipFwdState.RequestForwarding(); err != nil {
+		return err
+	}
+
 	if err := r.refreshRulesMap(); err != nil {
 		return fmt.Errorf(refreshRulesMapError, err)
 	}
@@ -836,6 +904,10 @@ func (r *router) removeAcceptForwardRulesIptables(ipt *iptables.IPTables) error
 
 // RemoveNatRule removes the prerouting mark rule
 func (r *router) RemoveNatRule(pair firewall.RouterPair) error {
+	if err := r.ipFwdState.ReleaseForwarding(); err != nil {
+		log.Errorf("%v", err)
+	}
+
 	if err := r.refreshRulesMap(); err != nil {
 		return fmt.Errorf(refreshRulesMapError, err)
 	}
@@ -896,6 +968,269 @@ func (r *router) refreshRulesMap() error {
 	return nil
 }
 
+func (r *router) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
+	if err := r.ipFwdState.RequestForwarding(); err != nil {
+		return nil, err
+	}
+
+	ruleKey := rule.ID()
+	if _, exists := r.rules[ruleKey+dnatSuffix]; exists {
+		return rule, nil
+	}
+
+	protoNum, err := protoToInt(rule.Protocol)
+	if err != nil {
+		return nil, fmt.Errorf("convert protocol to number: %w", err)
+	}
+
+	if err := r.addDnatRedirect(rule, protoNum, ruleKey); err != nil {
+		return nil, err
+	}
+
+	r.addDnatMasq(rule, protoNum, ruleKey)
+
+	// Unlike iptables, there's no point in adding "out" rules in the forward chain here as our policy is ACCEPT.
+	// To overcome DROP policies in other chains, we'd have to add rules to the chains there.
+	// We also cannot just add "oif <iface> accept" there and filter in our own table as we don't know what is supposed to be allowed.
+	// TODO: find chains with drop policies and add rules there
+
+	if err := r.conn.Flush(); err != nil {
+		return nil, fmt.Errorf("flush rules: %w", err)
+	}
+
+	return &rule, nil
+}
+
+func (r *router) addDnatRedirect(rule firewall.ForwardRule, protoNum uint8, ruleKey string) error {
+	dnatExprs := []expr.Any{
+		&expr.Meta{Key: expr.MetaKeyIIFNAME, Register: 1},
+		&expr.Cmp{
+			Op:       expr.CmpOpNeq,
+			Register: 1,
+			Data:     ifname(r.wgIface.Name()),
+		},
+		&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
+		&expr.Cmp{
+			Op:       expr.CmpOpEq,
+			Register: 1,
+			Data:     []byte{protoNum},
+		},
+		&expr.Payload{
+			DestRegister: 1,
+			Base:         expr.PayloadBaseTransportHeader,
+			Offset:       2,
+			Len:          2,
+		},
+	}
+	dnatExprs = append(dnatExprs, applyPort(&rule.DestinationPort, false)...)
+
+	// shifted translated port is not supported in nftables, so we hand this over to xtables
+	if rule.TranslatedPort.IsRange && len(rule.TranslatedPort.Values) == 2 {
+		if rule.TranslatedPort.Values[0] != rule.DestinationPort.Values[0] ||
+			rule.TranslatedPort.Values[1] != rule.DestinationPort.Values[1] {
+			return r.addXTablesRedirect(dnatExprs, ruleKey, rule)
+		}
+	}
+
+	additionalExprs, regProtoMin, regProtoMax, err := r.handleTranslatedPort(rule)
+	if err != nil {
+		return err
+	}
+	dnatExprs = append(dnatExprs, additionalExprs...)
+
+	dnatExprs = append(dnatExprs,
+		&expr.NAT{
+			Type:        expr.NATTypeDestNAT,
+			Family:      uint32(nftables.TableFamilyIPv4),
+			RegAddrMin:  1,
+			RegProtoMin: regProtoMin,
+			RegProtoMax: regProtoMax,
+		},
+	)
+
+	dnatRule := &nftables.Rule{
+		Table:    r.workTable,
+		Chain:    r.chains[chainNameRoutingRdr],
+		Exprs:    dnatExprs,
+		UserData: []byte(ruleKey + dnatSuffix),
+	}
+	r.conn.AddRule(dnatRule)
+	r.rules[ruleKey+dnatSuffix] = dnatRule
+
+	return nil
+}
+
+func (r *router) handleTranslatedPort(rule firewall.ForwardRule) ([]expr.Any, uint32, uint32, error) {
+	switch {
+	case rule.TranslatedPort.IsRange && len(rule.TranslatedPort.Values) == 2:
+		return r.handlePortRange(rule)
+	case len(rule.TranslatedPort.Values) == 0:
+		return r.handleAddressOnly(rule)
+	case len(rule.TranslatedPort.Values) == 1:
+		return r.handleSinglePort(rule)
+	default:
+		return nil, 0, 0, fmt.Errorf("invalid translated port: %v", rule.TranslatedPort)
+	}
+}
+
+func (r *router) handlePortRange(rule firewall.ForwardRule) ([]expr.Any, uint32, uint32, error) {
+	exprs := []expr.Any{
+		&expr.Immediate{
+			Register: 1,
+			Data:     rule.TranslatedAddress.AsSlice(),
+		},
+		&expr.Immediate{
+			Register: 2,
+			Data:     binaryutil.BigEndian.PutUint16(rule.TranslatedPort.Values[0]),
+		},
+		&expr.Immediate{
+			Register: 3,
+			Data:     binaryutil.BigEndian.PutUint16(rule.TranslatedPort.Values[1]),
+		},
+	}
+	return exprs, 2, 3, nil
+}
+
+func (r *router) handleAddressOnly(rule firewall.ForwardRule) ([]expr.Any, uint32, uint32, error) {
+	exprs := []expr.Any{
+		&expr.Immediate{
+			Register: 1,
+			Data:     rule.TranslatedAddress.AsSlice(),
+		},
+	}
+	return exprs, 0, 0, nil
+}
+
+func (r *router) handleSinglePort(rule firewall.ForwardRule) ([]expr.Any, uint32, uint32, error) {
+	exprs := []expr.Any{
+		&expr.Immediate{
+			Register: 1,
+			Data:     rule.TranslatedAddress.AsSlice(),
+		},
+		&expr.Immediate{
+			Register: 2,
+			Data:     binaryutil.BigEndian.PutUint16(rule.TranslatedPort.Values[0]),
+		},
+	}
+	return exprs, 2, 0, nil
+}
+
+func (r *router) addXTablesRedirect(dnatExprs []expr.Any, ruleKey string, rule firewall.ForwardRule) error {
+	dnatExprs = append(dnatExprs,
+		&expr.Counter{},
+		&expr.Target{
+			Name: "DNAT",
+			Rev:  2,
+			Info: &xt.NatRange2{
+				NatRange: xt.NatRange{
+					Flags:   uint(xt.NatRangeMapIPs | xt.NatRangeProtoSpecified | xt.NatRangeProtoOffset),
+					MinIP:   rule.TranslatedAddress.AsSlice(),
+					MaxIP:   rule.TranslatedAddress.AsSlice(),
+					MinPort: rule.TranslatedPort.Values[0],
+					MaxPort: rule.TranslatedPort.Values[1],
+				},
+				BasePort: rule.DestinationPort.Values[0],
+			},
+		},
+	)
+
+	dnatRule := &nftables.Rule{
+		Table: &nftables.Table{
+			Name:   tableNat,
+			Family: nftables.TableFamilyIPv4,
+		},
+		Chain: &nftables.Chain{
+			Name:     chainNameNatPrerouting,
+			Table:    r.filterTable,
+			Type:     nftables.ChainTypeNAT,
+			Hooknum:  nftables.ChainHookPrerouting,
+			Priority: nftables.ChainPriorityNATDest,
+		},
+		Exprs:    dnatExprs,
+		UserData: []byte(ruleKey + dnatSuffix),
+	}
+	r.conn.AddRule(dnatRule)
+	r.rules[ruleKey+dnatSuffix] = dnatRule
+
+	return nil
+}
+
+func (r *router) addDnatMasq(rule firewall.ForwardRule, protoNum uint8, ruleKey string) {
+	masqExprs := []expr.Any{
+		&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
+		&expr.Cmp{
+			Op:       expr.CmpOpEq,
+			Register: 1,
+			Data:     ifname(r.wgIface.Name()),
+		},
+		&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
+		&expr.Cmp{
+			Op:       expr.CmpOpEq,
+			Register: 1,
+			Data:     []byte{protoNum},
+		},
+		&expr.Payload{
+			DestRegister: 1,
+			Base:         expr.PayloadBaseNetworkHeader,
+			Offset:       16,
+			Len:          4,
+		},
+		&expr.Cmp{
+			Op:       expr.CmpOpEq,
+			Register: 1,
+			Data:     rule.TranslatedAddress.AsSlice(),
+		},
+	}
+
+	masqExprs = append(masqExprs, applyPort(&rule.TranslatedPort, false)...)
+	masqExprs = append(masqExprs, &expr.Masq{})
+
+	masqRule := &nftables.Rule{
+		Table:    r.workTable,
+		Chain:    r.chains[chainNameRoutingNat],
+		Exprs:    masqExprs,
+		UserData: []byte(ruleKey + snatSuffix),
+	}
+	r.conn.AddRule(masqRule)
+	r.rules[ruleKey+snatSuffix] = masqRule
+}
+
+func (r *router) DeleteDNATRule(rule firewall.Rule) error {
+	if err := r.ipFwdState.ReleaseForwarding(); err != nil {
+		log.Errorf("%v", err)
+	}
+
+	ruleKey := rule.ID()
+
+	if err := r.refreshRulesMap(); err != nil {
+		return fmt.Errorf(refreshRulesMapError, err)
+	}
+
+	var merr *multierror.Error
+	if dnatRule, exists := r.rules[ruleKey+dnatSuffix]; exists {
+		if err := r.conn.DelRule(dnatRule); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete dnat rule: %w", err))
+		}
+	}
+
+	if masqRule, exists := r.rules[ruleKey+snatSuffix]; exists {
+		if err := r.conn.DelRule(masqRule); err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("delete snat rule: %w", err))
+		}
+	}
+
+	if err := r.conn.Flush(); err != nil {
+		merr = multierror.Append(merr, fmt.Errorf(flushError, err))
+	}
+
+	if merr == nil {
+		delete(r.rules, ruleKey+dnatSuffix)
+		delete(r.rules, ruleKey+snatSuffix)
+	}
+
+	return nberrors.FormatErrorOrNil(merr)
+}
+
 // generateCIDRMatcherExpressions generates nftables expressions that matches a CIDR
 func generateCIDRMatcherExpressions(source bool, prefix netip.Prefix) []expr.Any {
 	var offset uint32
@@ -959,15 +1294,11 @@ func applyPort(port *firewall.Port, isSource bool) []expr.Any {
 	if port.IsRange && len(port.Values) == 2 {
 		// Handle port range
 		exprs = append(exprs,
-			&expr.Cmp{
+			&expr.Range{
-				Op:       expr.CmpOpGte,
+				Op:       expr.CmpOpEq,
 				Register: 1,
-				Data:     binaryutil.BigEndian.PutUint16(port.Values[0]),
+				FromData: binaryutil.BigEndian.PutUint16(port.Values[0]),
-			},
+				ToData:   binaryutil.BigEndian.PutUint16(port.Values[1]),
-			&expr.Cmp{
-				Op:       expr.CmpOpLte,
-				Register: 1,
-				Data:     binaryutil.BigEndian.PutUint16(port.Values[1]),
 			},
 		)
 	} else {

client/firewall/nftables/router_linux_test.go

@@ -311,7 +311,7 @@ func TestRouter_AddRouteFiltering(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			ruleKey, err := r.AddRouteFiltering(tt.sources, tt.destination, tt.proto, tt.sPort, tt.dPort, tt.action)
+			ruleKey, err := r.AddRouteFiltering(nil, tt.sources, tt.destination, tt.proto, tt.sPort, tt.dPort, tt.action)
 			require.NoError(t, err, "AddRouteFiltering failed")
 
 			t.Cleanup(func() {
@@ -319,7 +319,7 @@ func TestRouter_AddRouteFiltering(t *testing.T) {
 			})
 
 			// Check if the rule is in the internal map
-			rule, ok := r.rules[ruleKey.GetRuleID()]
+			rule, ok := r.rules[ruleKey.ID()]
 			assert.True(t, ok, "Rule not found in internal map")
 
 			t.Log("Internal rule expressions:")
@@ -336,7 +336,7 @@ func TestRouter_AddRouteFiltering(t *testing.T) {
 
 			var nftRule *nftables.Rule
 			for _, rule := range rules {
-				if string(rule.UserData) == ruleKey.GetRuleID() {
+				if string(rule.UserData) == ruleKey.ID() {
 					nftRule = rule
 					break
 				}
@@ -595,16 +595,20 @@ func containsPort(exprs []expr.Any, port *firewall.Port, isSource bool) bool {
 			if ex.Base == expr.PayloadBaseTransportHeader && ex.Offset == offset && ex.Len == 2 {
 				payloadFound = true
 			}
-		case *expr.Cmp:
+		case *expr.Range:
-			if port.IsRange {
+			if port.IsRange && len(port.Values) == 2 {
-				if ex.Op == expr.CmpOpGte || ex.Op == expr.CmpOpLte {
+				fromPort := binary.BigEndian.Uint16(ex.FromData)
+				toPort := binary.BigEndian.Uint16(ex.ToData)
+				if fromPort == port.Values[0] && toPort == port.Values[1] {
 					portMatchFound = true
 				}
-			} else {
+			}
+		case *expr.Cmp:
+			if !port.IsRange {
 				if ex.Op == expr.CmpOpEq && len(ex.Data) == 2 {
 					portValue := binary.BigEndian.Uint16(ex.Data)
 					for _, p := range port.Values {
-						if uint16(p) == portValue {
+						if p == portValue {
 							portMatchFound = true
 							break
 						}

client/firewall/nftables/rule_linux.go

@@ -16,6 +16,6 @@ type Rule struct {
 }
 
 // GetRuleID returns the rule id
-func (r *Rule) GetRuleID() string {
+func (r *Rule) ID() string {
 	return r.ruleID
 }

client/firewall/nftables/state_linux.go

@@ -3,13 +3,12 @@ package nftables
 import (
 	"fmt"
 
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
-	"github.com/netbirdio/netbird/client/iface/device"
 )
 
 type InterfaceState struct {
 	NameStr       string         `json:"name"`
-	WGAddress     iface.WGAddress `json:"wg_address"`
+	WGAddress     wgaddr.Address `json:"wg_address"`
 	UserspaceBind bool           `json:"userspace_bind"`
 }
 
@@ -17,7 +16,7 @@ func (i *InterfaceState) Name() string {
 	return i.NameStr
 }
 
-func (i *InterfaceState) Address() device.WGAddress {
+func (i *InterfaceState) Address() wgaddr.Address {
 	return i.WGAddress
 }
 

client/firewall/uspfilter/allow_netbird.go

@@ -4,6 +4,7 @@ package uspfilter
 
 import (
 	"context"
+	"net/netip"
 	"time"
 
 	log "github.com/sirupsen/logrus"
@@ -16,8 +17,8 @@ func (m *Manager) Close(stateManager *statemanager.Manager) error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	m.outgoingRules = make(map[string]RuleSet)
+	m.outgoingRules = make(map[netip.Addr]RuleSet)
-	m.incomingRules = make(map[string]RuleSet)
+	m.incomingRules = make(map[netip.Addr]RuleSet)
 
 	if m.udpTracker != nil {
 		m.udpTracker.Close()
@@ -31,8 +32,8 @@ func (m *Manager) Close(stateManager *statemanager.Manager) error {
 		m.tcpTracker.Close()
 	}
 
-	if m.forwarder != nil {
+	if fwder := m.forwarder.Load(); fwder != nil {
-		m.forwarder.Stop()
+		fwder.Stop()
 	}
 
 	if m.logger != nil {

client/firewall/uspfilter/allow_netbird_windows.go

@@ -3,12 +3,14 @@ package uspfilter
 import (
 	"context"
 	"fmt"
+	"net/netip"
 	"os/exec"
 	"syscall"
 	"time"
 
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
@@ -20,28 +22,31 @@ const (
 	firewallRuleName        = "Netbird"
 )
 
-// Close closes the firewall manager
+// Reset firewall to the default state
 func (m *Manager) Close(*statemanager.Manager) error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	m.outgoingRules = make(map[string]RuleSet)
+	m.outgoingRules = make(map[netip.Addr]RuleSet)
-	m.incomingRules = make(map[string]RuleSet)
+	m.incomingRules = make(map[netip.Addr]RuleSet)
 
 	if m.udpTracker != nil {
 		m.udpTracker.Close()
+		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger, m.flowLogger)
 	}
 
 	if m.icmpTracker != nil {
 		m.icmpTracker.Close()
+		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger, m.flowLogger)
 	}
 
 	if m.tcpTracker != nil {
 		m.tcpTracker.Close()
+		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger, m.flowLogger)
 	}
 
-	if m.forwarder != nil {
+	if fwder := m.forwarder.Load(); fwder != nil {
-		m.forwarder.Stop()
+		fwder.Stop()
 	}
 
 	if m.logger != nil {

client/firewall/uspfilter/common/iface.go

@@ -3,14 +3,14 @@ package common
 import (
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
-	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // IFaceMapper defines subset methods of interface required for manager
 type IFaceMapper interface {
 	SetFilter(device.PacketFilter) error
-	Address() iface.WGAddress
+	Address() wgaddr.Address
 	GetWGDevice() *wgdevice.Device
 	GetDevice() *device.FilteredDevice
 }

client/firewall/uspfilter/conntrack/common.go

@@ -1,20 +1,27 @@
-// common.go
 package conntrack
 
 import (
-	"net"
+	"fmt"
-	"sync"
+	"net/netip"
 	"sync/atomic"
 	"time"
+
+	"github.com/google/uuid"
+
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 // BaseConnTrack provides common fields and locking for all connection types
 type BaseConnTrack struct {
-	SourceIP   net.IP
+	FlowId    uuid.UUID
-	DestIP     net.IP
+	Direction nftypes.Direction
-	SourcePort uint16
+	SourceIP  netip.Addr
-	DestPort   uint16
+	DestIP    netip.Addr
-	lastSeen   atomic.Int64 // Unix nano for atomic access
+	lastSeen  atomic.Int64
+	PacketsTx atomic.Uint64
+	PacketsRx atomic.Uint64
+	BytesTx   atomic.Uint64
+	BytesRx   atomic.Uint64
 }
 
 // these small methods will be inlined by the compiler
@@ -24,6 +31,17 @@ func (b *BaseConnTrack) UpdateLastSeen() {
 	b.lastSeen.Store(time.Now().UnixNano())
 }
 
+// UpdateCounters safely updates the packet and byte counters
+func (b *BaseConnTrack) UpdateCounters(direction nftypes.Direction, bytes int) {
+	if direction == nftypes.Egress {
+		b.PacketsTx.Add(1)
+		b.BytesTx.Add(uint64(bytes))
+	} else {
+		b.PacketsRx.Add(1)
+		b.BytesRx.Add(uint64(bytes))
+	}
+}
+
 // GetLastSeen safely gets the last seen timestamp
 func (b *BaseConnTrack) GetLastSeen() time.Time {
 	return time.Unix(0, b.lastSeen.Load())
@@ -35,92 +53,14 @@ func (b *BaseConnTrack) timeoutExceeded(timeout time.Duration) bool {
 	return time.Since(lastSeen) > timeout
 }
 
-// IPAddr is a fixed-size IP address to avoid allocations
-type IPAddr [16]byte
-
-// MakeIPAddr creates an IPAddr from net.IP
-func MakeIPAddr(ip net.IP) (addr IPAddr) {
-	// Optimization: check for v4 first as it's more common
-	if ip4 := ip.To4(); ip4 != nil {
-		copy(addr[12:], ip4)
-	} else {
-		copy(addr[:], ip.To16())
-	}
-	return addr
-}
-
 // ConnKey uniquely identifies a connection
 type ConnKey struct {
-	SrcIP   IPAddr
+	SrcIP   netip.Addr
-	DstIP   IPAddr
+	DstIP   netip.Addr
 	SrcPort uint16
 	DstPort uint16
 }
 
-// makeConnKey creates a connection key
+func (c ConnKey) String() string {
-func makeConnKey(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16) ConnKey {
+	return fmt.Sprintf("%s:%d -> %s:%d", c.SrcIP.Unmap(), c.SrcPort, c.DstIP.Unmap(), c.DstPort)
-	return ConnKey{
-		SrcIP:   MakeIPAddr(srcIP),
-		DstIP:   MakeIPAddr(dstIP),
-		SrcPort: srcPort,
-		DstPort: dstPort,
-	}
-}
-
-// ValidateIPs checks if IPs match without allocation
-func ValidateIPs(connIP IPAddr, pktIP net.IP) bool {
-	if ip4 := pktIP.To4(); ip4 != nil {
-		// Compare IPv4 addresses (last 4 bytes)
-		for i := 0; i < 4; i++ {
-			if connIP[12+i] != ip4[i] {
-				return false
-			}
-		}
-		return true
-	}
-	// Compare full IPv6 addresses
-	ip6 := pktIP.To16()
-	for i := 0; i < 16; i++ {
-		if connIP[i] != ip6[i] {
-			return false
-		}
-	}
-	return true
-}
-
-// PreallocatedIPs is a pool of IP byte slices to reduce allocations
-type PreallocatedIPs struct {
-	sync.Pool
-}
-
-// NewPreallocatedIPs creates a new IP pool
-func NewPreallocatedIPs() *PreallocatedIPs {
-	return &PreallocatedIPs{
-		Pool: sync.Pool{
-			New: func() interface{} {
-				ip := make(net.IP, 16)
-				return &ip
-			},
-		},
-	}
-}
-
-// Get retrieves an IP from the pool
-func (p *PreallocatedIPs) Get() net.IP {
-	return *p.Pool.Get().(*net.IP)
-}
-
-// Put returns an IP to the pool
-func (p *PreallocatedIPs) Put(ip net.IP) {
-	p.Pool.Put(&ip)
-}
-
-// copyIP copies an IP address efficiently
-func copyIP(dst, src net.IP) {
-	if len(src) == 16 {
-		copy(dst, src)
-	} else {
-		// Handle IPv4
-		copy(dst[12:], src.To4())
-	}
 }

client/firewall/uspfilter/conntrack/common_test.go

@@ -1,94 +1,67 @@
 package conntrack
 
 import (
-	"net"
+	"context"
+	"net/netip"
 	"testing"
 
 	"github.com/sirupsen/logrus"
 
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	"github.com/netbirdio/netbird/client/internal/netflow"
 )
 
 var logger = log.NewFromLogrus(logrus.StandardLogger())
-
+var flowLogger = netflow.NewManager(context.Background(), nil, []byte{}, nil).GetLogger()
-func BenchmarkIPOperations(b *testing.B) {
-	b.Run("MakeIPAddr", func(b *testing.B) {
-		ip := net.ParseIP("192.168.1.1")
-		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
-			_ = MakeIPAddr(ip)
-		}
-	})
-
-	b.Run("ValidateIPs", func(b *testing.B) {
-		ip1 := net.ParseIP("192.168.1.1")
-		ip2 := net.ParseIP("192.168.1.1")
-		addr := MakeIPAddr(ip1)
-		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
-			_ = ValidateIPs(addr, ip2)
-		}
-	})
-
-	b.Run("IPPool", func(b *testing.B) {
-		pool := NewPreallocatedIPs()
-		b.ResetTimer()
-		for i := 0; i < b.N; i++ {
-			ip := pool.Get()
-			pool.Put(ip)
-		}
-	})
-
-}
 
 // Memory pressure tests
 func BenchmarkMemoryPressure(b *testing.B) {
 	b.Run("TCPHighLoad", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
 		// Generate different IPs
-		srcIPs := make([]net.IP, 100)
+		srcIPs := make([]netip.Addr, 100)
-		dstIPs := make([]net.IP, 100)
+		dstIPs := make([]netip.Addr, 100)
 		for i := 0; i < 100; i++ {
-			srcIPs[i] = net.IPv4(192, 168, byte(i/256), byte(i%256))
+			srcIPs[i] = netip.AddrFrom4([4]byte{192, 168, byte(i / 256), byte(i % 256)})
-			dstIPs[i] = net.IPv4(10, 0, byte(i/256), byte(i%256))
+			dstIPs[i] = netip.AddrFrom4([4]byte{10, 0, byte(i / 256), byte(i % 256)})
 		}
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
 			srcIdx := i % len(srcIPs)
 			dstIdx := (i + 1) % len(dstIPs)
-			tracker.TrackOutbound(srcIPs[srcIdx], dstIPs[dstIdx], uint16(i%65535), 80, TCPSyn)
+			tracker.TrackOutbound(srcIPs[srcIdx], dstIPs[dstIdx], uint16(i%65535), 80, TCPSyn, 0)
 
 			// Simulate some valid inbound packets
 			if i%3 == 0 {
-				tracker.IsValidInbound(dstIPs[dstIdx], srcIPs[srcIdx], 80, uint16(i%65535), TCPAck)
+				tracker.IsValidInbound(dstIPs[dstIdx], srcIPs[srcIdx], 80, uint16(i%65535), TCPAck, 0)
 			}
 		}
 	})
 
 	b.Run("UDPHighLoad", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
 		// Generate different IPs
-		srcIPs := make([]net.IP, 100)
+		srcIPs := make([]netip.Addr, 100)
-		dstIPs := make([]net.IP, 100)
+		dstIPs := make([]netip.Addr, 100)
 		for i := 0; i < 100; i++ {
-			srcIPs[i] = net.IPv4(192, 168, byte(i/256), byte(i%256))
+			srcIPs[i] = netip.AddrFrom4([4]byte{192, 168, byte(i / 256), byte(i % 256)})
-			dstIPs[i] = net.IPv4(10, 0, byte(i/256), byte(i%256))
+			dstIPs[i] = netip.AddrFrom4([4]byte{10, 0, byte(i / 256), byte(i % 256)})
 		}
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
 			srcIdx := i % len(srcIPs)
 			dstIdx := (i + 1) % len(dstIPs)
-			tracker.TrackOutbound(srcIPs[srcIdx], dstIPs[dstIdx], uint16(i%65535), 80)
+			tracker.TrackOutbound(srcIPs[srcIdx], dstIPs[dstIdx], uint16(i%65535), 80, 0)
 
 			// Simulate some valid inbound packets
 			if i%3 == 0 {
-				tracker.IsValidInbound(dstIPs[dstIdx], srcIPs[srcIdx], 80, uint16(i%65535))
+				tracker.IsValidInbound(dstIPs[dstIdx], srcIPs[srcIdx], 80, uint16(i%65535), 0)
 			}
 		}
 	})

client/firewall/uspfilter/conntrack/icmp.go

@@ -1,13 +1,17 @@
 package conntrack
 
 import (
-	"net"
+	"context"
+	"fmt"
+	"net/netip"
 	"sync"
 	"time"
 
 	"github.com/google/gopacket/layers"
+	"github.com/google/uuid"
 
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 const (
@@ -19,18 +23,20 @@ const (
 
 // ICMPConnKey uniquely identifies an ICMP connection
 type ICMPConnKey struct {
-	// Supports both IPv4 and IPv6
+	SrcIP netip.Addr
-	SrcIP    [16]byte
+	DstIP netip.Addr
-	DstIP    [16]byte
+	ID    uint16
-	Sequence uint16 // ICMP sequence number
+}
-	ID       uint16 // ICMP identifier
+
+func (i ICMPConnKey) String() string {
+	return fmt.Sprintf("%s -> %s (id %d)", i.SrcIP, i.DstIP, i.ID)
 }
 
 // ICMPConnTrack represents an ICMP connection state
 type ICMPConnTrack struct {
 	BaseConnTrack
-	Sequence uint16
+	ICMPType uint8
-	ID       uint16
+	ICMPCode uint8
 }
 
 // ICMPTracker manages ICMP connection states
@@ -39,131 +45,201 @@ type ICMPTracker struct {
 	connections   map[ICMPConnKey]*ICMPConnTrack
 	timeout       time.Duration
 	cleanupTicker *time.Ticker
+	tickerCancel  context.CancelFunc
 	mutex         sync.RWMutex
-	done          chan struct{}
+	flowLogger    nftypes.FlowLogger
-	ipPool        *PreallocatedIPs
 }
 
 // NewICMPTracker creates a new ICMP connection tracker
-func NewICMPTracker(timeout time.Duration, logger *nblog.Logger) *ICMPTracker {
+func NewICMPTracker(timeout time.Duration, logger *nblog.Logger, flowLogger nftypes.FlowLogger) *ICMPTracker {
 	if timeout == 0 {
 		timeout = DefaultICMPTimeout
 	}
 
+	ctx, cancel := context.WithCancel(context.Background())
+
 	tracker := &ICMPTracker{
 		logger:        logger,
 		connections:   make(map[ICMPConnKey]*ICMPConnTrack),
 		timeout:       timeout,
 		cleanupTicker: time.NewTicker(ICMPCleanupInterval),
-		done:          make(chan struct{}),
+		tickerCancel:  cancel,
-		ipPool:        NewPreallocatedIPs(),
+		flowLogger:    flowLogger,
 	}
 
-	go tracker.cleanupRoutine()
+	go tracker.cleanupRoutine(ctx)
 	return tracker
 }
 
-// TrackOutbound records an outbound ICMP Echo Request
+func (t *ICMPTracker) updateIfExists(srcIP netip.Addr, dstIP netip.Addr, id uint16, direction nftypes.Direction, size int) (ICMPConnKey, bool) {
-func (t *ICMPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, id uint16, seq uint16) {
+	key := ICMPConnKey{
-	key := makeICMPKey(srcIP, dstIP, id, seq)
+		SrcIP: srcIP,
-
+		DstIP: dstIP,
-	t.mutex.Lock()
-	conn, exists := t.connections[key]
-	if !exists {
-		srcIPCopy := t.ipPool.Get()
-		dstIPCopy := t.ipPool.Get()
-		copyIP(srcIPCopy, srcIP)
-		copyIP(dstIPCopy, dstIP)
-
-		conn = &ICMPConnTrack{
-			BaseConnTrack: BaseConnTrack{
-				SourceIP: srcIPCopy,
-				DestIP:   dstIPCopy,
-			},
 		ID:    id,
-			Sequence: seq,
 	}
-		conn.UpdateLastSeen()
-		t.connections[key] = conn
-
-		t.logger.Trace("New ICMP connection %v", key)
-	}
-	t.mutex.Unlock()
-
-	conn.UpdateLastSeen()
-}
-
-// IsValidInbound checks if an inbound ICMP Echo Reply matches a tracked request
-func (t *ICMPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, id uint16, seq uint16, icmpType uint8) bool {
-	if icmpType != uint8(layers.ICMPv4TypeEchoReply) {
-		return false
-	}
-
-	key := makeICMPKey(dstIP, srcIP, id, seq)
 
 	t.mutex.RLock()
 	conn, exists := t.connections[key]
 	t.mutex.RUnlock()
 
-	if !exists {
+	if exists {
-		return false
+		conn.UpdateLastSeen()
+		conn.UpdateCounters(direction, size)
+
+		return key, true
 	}
 
-	if conn.timeoutExceeded(t.timeout) {
+	return key, false
-		return false
-	}
-
-	return ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
-		ValidateIPs(MakeIPAddr(dstIP), conn.SourceIP) &&
-		conn.ID == id &&
-		conn.Sequence == seq
 }
 
-func (t *ICMPTracker) cleanupRoutine() {
+// TrackOutbound records an outbound ICMP connection
+func (t *ICMPTracker) TrackOutbound(srcIP netip.Addr, dstIP netip.Addr, id uint16, typecode layers.ICMPv4TypeCode, size int) {
+	if _, exists := t.updateIfExists(dstIP, srcIP, id, nftypes.Egress, size); !exists {
+		// if (inverted direction) conn is not tracked, track this direction
+		t.track(srcIP, dstIP, id, typecode, nftypes.Egress, nil, size)
+	}
+}
+
+// TrackInbound records an inbound ICMP Echo Request
+func (t *ICMPTracker) TrackInbound(srcIP netip.Addr, dstIP netip.Addr, id uint16, typecode layers.ICMPv4TypeCode, ruleId []byte, size int) {
+	t.track(srcIP, dstIP, id, typecode, nftypes.Ingress, ruleId, size)
+}
+
+// track is the common implementation for tracking both inbound and outbound ICMP connections
+func (t *ICMPTracker) track(srcIP netip.Addr, dstIP netip.Addr, id uint16, typecode layers.ICMPv4TypeCode, direction nftypes.Direction, ruleId []byte, size int) {
+	key, exists := t.updateIfExists(srcIP, dstIP, id, direction, size)
+	if exists {
+		return
+	}
+
+	typ, code := typecode.Type(), typecode.Code()
+
+	// non echo requests don't need tracking
+	if typ != uint8(layers.ICMPv4TypeEchoRequest) {
+		t.logger.Trace("New %s ICMP connection %s type %d code %d", direction, key, typ, code)
+		t.sendStartEvent(direction, srcIP, dstIP, typ, code, ruleId, size)
+		return
+	}
+
+	conn := &ICMPConnTrack{
+		BaseConnTrack: BaseConnTrack{
+			FlowId:    uuid.New(),
+			Direction: direction,
+			SourceIP:  srcIP,
+			DestIP:    dstIP,
+		},
+		ICMPType: typ,
+		ICMPCode: code,
+	}
+	conn.UpdateLastSeen()
+
+	t.mutex.Lock()
+	t.connections[key] = conn
+	t.mutex.Unlock()
+
+	t.logger.Trace("New %s ICMP connection %s type %d code %d", direction, key, typ, code)
+	t.sendEvent(nftypes.TypeStart, conn, ruleId)
+}
+
+// IsValidInbound checks if an inbound ICMP Echo Reply matches a tracked request
+func (t *ICMPTracker) IsValidInbound(srcIP netip.Addr, dstIP netip.Addr, id uint16, icmpType uint8, size int) bool {
+	if icmpType != uint8(layers.ICMPv4TypeEchoReply) {
+		return false
+	}
+
+	key := ICMPConnKey{
+		SrcIP: dstIP,
+		DstIP: srcIP,
+		ID:    id,
+	}
+
+	t.mutex.RLock()
+	conn, exists := t.connections[key]
+	t.mutex.RUnlock()
+
+	if !exists || conn.timeoutExceeded(t.timeout) {
+		return false
+	}
+
+	conn.UpdateLastSeen()
+	conn.UpdateCounters(nftypes.Ingress, size)
+
+	return true
+}
+
+func (t *ICMPTracker) cleanupRoutine(ctx context.Context) {
+	defer t.tickerCancel()
+
 	for {
 		select {
 		case <-t.cleanupTicker.C:
 			t.cleanup()
-		case <-t.done:
+		case <-ctx.Done():
 			return
 		}
 	}
 }
+
 func (t *ICMPTracker) cleanup() {
 	t.mutex.Lock()
 	defer t.mutex.Unlock()
 
 	for key, conn := range t.connections {
 		if conn.timeoutExceeded(t.timeout) {
-			t.ipPool.Put(conn.SourceIP)
-			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
 
-			t.logger.Debug("Removed ICMP connection %v (timeout)", key)
+			t.logger.Debug("Removed ICMP connection %s (timeout) [in: %d Pkts/%d B out: %d Pkts/%d B]",
+				key, conn.PacketsRx.Load(), conn.BytesRx.Load(), conn.PacketsTx.Load(), conn.BytesTx.Load())
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 	}
 }
 
 // Close stops the cleanup routine and releases resources
 func (t *ICMPTracker) Close() {
-	t.cleanupTicker.Stop()
+	t.tickerCancel()
-	close(t.done)
 
 	t.mutex.Lock()
-	for _, conn := range t.connections {
-		t.ipPool.Put(conn.SourceIP)
-		t.ipPool.Put(conn.DestIP)
-	}
 	t.connections = nil
 	t.mutex.Unlock()
 }
 
-// makeICMPKey creates an ICMP connection key
+func (t *ICMPTracker) sendEvent(typ nftypes.Type, conn *ICMPConnTrack, ruleID []byte) {
-func makeICMPKey(srcIP net.IP, dstIP net.IP, id uint16, seq uint16) ICMPConnKey {
+	t.flowLogger.StoreEvent(nftypes.EventFields{
-	return ICMPConnKey{
+		FlowID:    conn.FlowId,
-		SrcIP:    MakeIPAddr(srcIP),
+		Type:      typ,
-		DstIP:    MakeIPAddr(dstIP),
+		RuleID:    ruleID,
-		ID:       id,
+		Direction: conn.Direction,
-		Sequence: seq,
+		Protocol:  nftypes.ICMP, // TODO: adjust for IPv6/icmpv6
-	}
+		SourceIP:  conn.SourceIP,
+		DestIP:    conn.DestIP,
+		ICMPType:  conn.ICMPType,
+		ICMPCode:  conn.ICMPCode,
+		RxPackets: conn.PacketsRx.Load(),
+		TxPackets: conn.PacketsTx.Load(),
+		RxBytes:   conn.BytesRx.Load(),
+		TxBytes:   conn.BytesTx.Load(),
+	})
+}
+
+func (t *ICMPTracker) sendStartEvent(direction nftypes.Direction, srcIP netip.Addr, dstIP netip.Addr, typ uint8, code uint8, ruleID []byte, size int) {
+	fields := nftypes.EventFields{
+		FlowID:    uuid.New(),
+		Type:      nftypes.TypeStart,
+		RuleID:    ruleID,
+		Direction: direction,
+		Protocol:  nftypes.ICMP,
+		SourceIP:  srcIP,
+		DestIP:    dstIP,
+		ICMPType:  typ,
+		ICMPCode:  code,
+	}
+	if direction == nftypes.Ingress {
+		fields.RxPackets = 1
+		fields.RxBytes = uint64(size)
+	} else {
+		fields.TxPackets = 1
+		fields.TxBytes = uint64(size)
+	}
+	t.flowLogger.StoreEvent(fields)
 }

client/firewall/uspfilter/conntrack/icmp_test.go

@@ -1,39 +1,39 @@
 package conntrack
 
 import (
-	"net"
+	"net/netip"
 	"testing"
 )
 
 func BenchmarkICMPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewICMPTracker(DefaultICMPTimeout, logger)
+		tracker := NewICMPTracker(DefaultICMPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), uint16(i%65535))
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 0, 0)
 		}
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewICMPTracker(DefaultICMPTimeout, logger)
+		tracker := NewICMPTracker(DefaultICMPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		// Pre-populate some connections
 		for i := 0; i < 1000; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i), uint16(i))
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 0, 0)
 		}
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.IsValidInbound(dstIP, srcIP, uint16(i%1000), uint16(i%1000), 0)
+			tracker.IsValidInbound(dstIP, srcIP, uint16(i%1000), 0, 0)
 		}
 	})
 }

client/firewall/uspfilter/conntrack/tcp.go

@@ -3,12 +3,16 @@ package conntrack
 // TODO: Send RST packets for invalid/timed-out connections
 
 import (
-	"net"
+	"context"
+	"net/netip"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/google/uuid"
+
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 const (
@@ -39,6 +43,35 @@ const (
 // TCPState represents the state of a TCP connection
 type TCPState int
 
+func (s TCPState) String() string {
+	switch s {
+	case TCPStateNew:
+		return "New"
+	case TCPStateSynSent:
+		return "SYN Sent"
+	case TCPStateSynReceived:
+		return "SYN Received"
+	case TCPStateEstablished:
+		return "Established"
+	case TCPStateFinWait1:
+		return "FIN Wait 1"
+	case TCPStateFinWait2:
+		return "FIN Wait 2"
+	case TCPStateClosing:
+		return "Closing"
+	case TCPStateTimeWait:
+		return "Time Wait"
+	case TCPStateCloseWait:
+		return "Close Wait"
+	case TCPStateLastAck:
+		return "Last ACK"
+	case TCPStateClosed:
+		return "Closed"
+	default:
+		return "Unknown"
+	}
+}
+
 const (
 	TCPStateNew TCPState = iota
 	TCPStateSynSent
@@ -53,19 +86,14 @@ const (
 	TCPStateClosed
 )
 
-// TCPConnKey uniquely identifies a TCP connection
-type TCPConnKey struct {
-	SrcIP   [16]byte
-	DstIP   [16]byte
-	SrcPort uint16
-	DstPort uint16
-}
-
 // TCPConnTrack represents a TCP connection state
 type TCPConnTrack struct {
 	BaseConnTrack
+	SourcePort  uint16
+	DestPort    uint16
 	State       TCPState
 	established atomic.Bool
+	tombstone   atomic.Bool
 	sync.RWMutex
 }
 
@@ -79,78 +107,126 @@ func (t *TCPConnTrack) SetEstablished(state bool) {
 	t.established.Store(state)
 }
 
+// IsTombstone safely checks if the connection is marked for deletion
+func (t *TCPConnTrack) IsTombstone() bool {
+	return t.tombstone.Load()
+}
+
+// SetTombstone safely marks the connection for deletion
+func (t *TCPConnTrack) SetTombstone() {
+	t.tombstone.Store(true)
+}
+
 // TCPTracker manages TCP connection states
 type TCPTracker struct {
 	logger        *nblog.Logger
 	connections   map[ConnKey]*TCPConnTrack
 	mutex         sync.RWMutex
 	cleanupTicker *time.Ticker
-	done          chan struct{}
+	tickerCancel  context.CancelFunc
 	timeout       time.Duration
-	ipPool        *PreallocatedIPs
+	flowLogger    nftypes.FlowLogger
 }
 
 // NewTCPTracker creates a new TCP connection tracker
-func NewTCPTracker(timeout time.Duration, logger *nblog.Logger) *TCPTracker {
+func NewTCPTracker(timeout time.Duration, logger *nblog.Logger, flowLogger nftypes.FlowLogger) *TCPTracker {
+	if timeout == 0 {
+		timeout = DefaultTCPTimeout
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+
 	tracker := &TCPTracker{
 		logger:        logger,
 		connections:   make(map[ConnKey]*TCPConnTrack),
 		cleanupTicker: time.NewTicker(TCPCleanupInterval),
-		done:          make(chan struct{}),
+		tickerCancel:  cancel,
 		timeout:       timeout,
-		ipPool:        NewPreallocatedIPs(),
+		flowLogger:    flowLogger,
 	}
 
-	go tracker.cleanupRoutine()
+	go tracker.cleanupRoutine(ctx)
 	return tracker
 }
 
-// TrackOutbound processes an outbound TCP packet and updates connection state
+func (t *TCPTracker) updateIfExists(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, flags uint8, direction nftypes.Direction, size int) (ConnKey, bool) {
-func (t *TCPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16, flags uint8) {
+	key := ConnKey{
-	// Create key before lock
+		SrcIP:   srcIP,
-	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
+		DstIP:   dstIP,
+		SrcPort: srcPort,
+		DstPort: dstPort,
+	}
 
-	t.mutex.Lock()
+	t.mutex.RLock()
 	conn, exists := t.connections[key]
-	if !exists {
+	t.mutex.RUnlock()
-		// Use preallocated IPs
-		srcIPCopy := t.ipPool.Get()
-		dstIPCopy := t.ipPool.Get()
-		copyIP(srcIPCopy, srcIP)
-		copyIP(dstIPCopy, dstIP)
 
-		conn = &TCPConnTrack{
+	if exists {
+		conn.Lock()
+		t.updateState(key, conn, flags, conn.Direction == nftypes.Egress)
+		conn.Unlock()
+
+		conn.UpdateCounters(direction, size)
+
+		return key, true
+	}
+
+	return key, false
+}
+
+// TrackOutbound records an outbound TCP connection
+func (t *TCPTracker) TrackOutbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, flags uint8, size int) {
+	if _, exists := t.updateIfExists(dstIP, srcIP, dstPort, srcPort, flags, 0, 0); !exists {
+		// if (inverted direction) conn is not tracked, track this direction
+		t.track(srcIP, dstIP, srcPort, dstPort, flags, nftypes.Egress, nil, size)
+	}
+}
+
+// TrackInbound processes an inbound TCP packet and updates connection state
+func (t *TCPTracker) TrackInbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, flags uint8, ruleID []byte, size int) {
+	t.track(srcIP, dstIP, srcPort, dstPort, flags, nftypes.Ingress, ruleID, size)
+}
+
+// track is the common implementation for tracking both inbound and outbound connections
+func (t *TCPTracker) track(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, flags uint8, direction nftypes.Direction, ruleID []byte, size int) {
+	key, exists := t.updateIfExists(srcIP, dstIP, srcPort, dstPort, flags, direction, size)
+	if exists {
+		return
+	}
+
+	conn := &TCPConnTrack{
 		BaseConnTrack: BaseConnTrack{
-				SourceIP:   srcIPCopy,
+			FlowId:    uuid.New(),
-				DestIP:     dstIPCopy,
+			Direction: direction,
+			SourceIP:  srcIP,
+			DestIP:    dstIP,
+		},
 		SourcePort: srcPort,
 		DestPort:   dstPort,
-			},
-			State: TCPStateNew,
 	}
-		conn.UpdateLastSeen()
-		conn.established.Store(false)
-		t.connections[key] = conn
 
-		t.logger.Trace("New TCP connection: %s:%d -> %s:%d", srcIP, srcPort, dstIP, dstPort)
+	conn.established.Store(false)
-	}
+	conn.tombstone.Store(false)
+
+	t.logger.Trace("New %s TCP connection: %s", direction, key)
+	t.updateState(key, conn, flags, direction == nftypes.Egress)
+
+	t.mutex.Lock()
+	t.connections[key] = conn
 	t.mutex.Unlock()
 
-	// Lock individual connection for state update
+	t.sendEvent(nftypes.TypeStart, conn, ruleID)
-	conn.Lock()
-	t.updateState(conn, flags, true)
-	conn.Unlock()
-	conn.UpdateLastSeen()
 }
 
 // IsValidInbound checks if an inbound TCP packet matches a tracked connection
-func (t *TCPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16, flags uint8) bool {
+func (t *TCPTracker) IsValidInbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, flags uint8, size int) bool {
-	if !isValidFlagCombination(flags) {
+	key := ConnKey{
-		return false
+		SrcIP:   dstIP,
+		DstIP:   srcIP,
+		SrcPort: dstPort,
+		DstPort: srcPort,
 	}
 
-	key := makeConnKey(dstIP, srcIP, dstPort, srcPort)
-
 	t.mutex.RLock()
 	conn, exists := t.connections[key]
 	t.mutex.RUnlock()
@@ -159,22 +235,26 @@ func (t *TCPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, srcPort uint16,
 		return false
 	}
 
-	// Handle RST packets
+	// Handle RST flag specially - it always causes transition to closed
 	if flags&TCPRst != 0 {
-		conn.Lock()
+		if conn.IsTombstone() {
-		if conn.IsEstablished() || conn.State == TCPStateSynSent || conn.State == TCPStateSynReceived {
-			conn.State = TCPStateClosed
-			conn.SetEstablished(false)
-			conn.Unlock()
 			return true
 		}
-		conn.Unlock()
-		return false
-	}
 
 		conn.Lock()
-	t.updateState(conn, flags, false)
+		conn.SetTombstone()
-	conn.UpdateLastSeen()
+		conn.State = TCPStateClosed
+		conn.SetEstablished(false)
+		conn.Unlock()
+		conn.UpdateCounters(nftypes.Ingress, size)
+
+		t.logger.Trace("TCP connection reset: %s", key)
+		t.sendEvent(nftypes.TypeEnd, conn, nil)
+		return true
+	}
+
+	conn.Lock()
+	t.updateState(key, conn, flags, false)
 	isEstablished := conn.IsEstablished()
 	isValidState := t.isValidStateForFlags(conn.State, flags)
 	conn.Unlock()
@@ -183,18 +263,17 @@ func (t *TCPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, srcPort uint16,
 }
 
 // updateState updates the TCP connection state based on flags
-func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound bool) {
+func (t *TCPTracker) updateState(key ConnKey, conn *TCPConnTrack, flags uint8, isOutbound bool) {
-	// Handle RST flag specially - it always causes transition to closed
+	conn.UpdateLastSeen()
-	if flags&TCPRst != 0 {
-		conn.State = TCPStateClosed
-		conn.SetEstablished(false)
 
-		t.logger.Trace("TCP connection reset: %s:%d -> %s:%d",
+	state := conn.State
-			conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
+	defer func() {
-		return
+		if state != conn.State {
+			t.logger.Trace("TCP connection %s transitioned from %s to %s", key, state, conn.State)
 		}
+	}()
 
-	switch conn.State {
+	switch state {
 	case TCPStateNew:
 		if flags&TCPSyn != 0 && flags&TCPAck == 0 {
 			conn.State = TCPStateSynSent
@@ -203,11 +282,11 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 	case TCPStateSynSent:
 		if flags&TCPSyn != 0 && flags&TCPAck != 0 {
 			if isOutbound {
-				conn.State = TCPStateSynReceived
-			} else {
-				// Simultaneous open
 				conn.State = TCPStateEstablished
 				conn.SetEstablished(true)
+			} else {
+				// Simultaneous open
+				conn.State = TCPStateSynReceived
 			}
 		}
 
@@ -225,22 +304,32 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 				conn.State = TCPStateCloseWait
 			}
 			conn.SetEstablished(false)
+		} else if flags&TCPRst != 0 {
+			conn.State = TCPStateClosed
+			conn.SetTombstone()
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 
 	case TCPStateFinWait1:
 		switch {
 		case flags&TCPFin != 0 && flags&TCPAck != 0:
-			// Simultaneous close - both sides sent FIN
 			conn.State = TCPStateClosing
 		case flags&TCPFin != 0:
 			conn.State = TCPStateFinWait2
 		case flags&TCPAck != 0:
 			conn.State = TCPStateFinWait2
+		case flags&TCPRst != 0:
+			conn.State = TCPStateClosed
+			conn.SetTombstone()
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 
 	case TCPStateFinWait2:
 		if flags&TCPFin != 0 {
 			conn.State = TCPStateTimeWait
+
+			t.logger.Trace("TCP connection %s completed", key)
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 
 	case TCPStateClosing:
@@ -248,8 +337,8 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 			conn.State = TCPStateTimeWait
 			// Keep established = false from previous state
 
-			t.logger.Trace("TCP connection closed (simultaneous) - %s:%d -> %s:%d",
+			t.logger.Trace("TCP connection %s closed (simultaneous)", key)
-				conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 
 	case TCPStateCloseWait:
@@ -260,17 +349,12 @@ func (t *TCPTracker) updateState(conn *TCPConnTrack, flags uint8, isOutbound boo
 	case TCPStateLastAck:
 		if flags&TCPAck != 0 {
 			conn.State = TCPStateClosed
+			conn.SetTombstone()
 
-			t.logger.Trace("TCP connection gracefully closed: %s:%d -> %s:%d",
+			// Send close event for gracefully closed connections
-				conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
+			t.logger.Trace("TCP connection %s closed gracefully", key)
 		}
-
-	case TCPStateTimeWait:
-		// Stay in TIME-WAIT for 2MSL before transitioning to closed
-		// This is handled by the cleanup routine
-
-		t.logger.Trace("TCP connection completed - %s:%d -> %s:%d",
-			conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
 	}
 }
 
@@ -315,12 +399,14 @@ func (t *TCPTracker) isValidStateForFlags(state TCPState, flags uint8) bool {
 	return false
 }
 
-func (t *TCPTracker) cleanupRoutine() {
+func (t *TCPTracker) cleanupRoutine(ctx context.Context) {
+	defer t.cleanupTicker.Stop()
+
 	for {
 		select {
 		case <-t.cleanupTicker.C:
 			t.cleanup()
-		case <-t.done:
+		case <-ctx.Done():
 			return
 		}
 	}
@@ -331,6 +417,12 @@ func (t *TCPTracker) cleanup() {
 	defer t.mutex.Unlock()
 
 	for key, conn := range t.connections {
+		if conn.IsTombstone() {
+			// Clean up tombstoned connections without sending an event
+			delete(t.connections, key)
+			continue
+		}
+
 		var timeout time.Duration
 		switch {
 		case conn.State == TCPStateTimeWait:
@@ -341,29 +433,26 @@ func (t *TCPTracker) cleanup() {
 			timeout = TCPHandshakeTimeout
 		}
 
-		lastSeen := conn.GetLastSeen()
+		if conn.timeoutExceeded(timeout) {
-		if time.Since(lastSeen) > timeout {
 			// Return IPs to pool
-			t.ipPool.Put(conn.SourceIP)
-			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
 
-			t.logger.Trace("Cleaned up TCP connection: %s:%d -> %s:%d", conn.SourceIP, conn.SourcePort, conn.DestIP, conn.DestPort)
+			t.logger.Trace("Cleaned up timed-out TCP connection %s", key)
+
+			// event already handled by state change
+			if conn.State != TCPStateTimeWait {
+				t.sendEvent(nftypes.TypeEnd, conn, nil)
+			}
 		}
 	}
 }
 
 // Close stops the cleanup routine and releases resources
 func (t *TCPTracker) Close() {
-	t.cleanupTicker.Stop()
+	t.tickerCancel()
-	close(t.done)
 
 	// Clean up all remaining IPs
 	t.mutex.Lock()
-	for _, conn := range t.connections {
-		t.ipPool.Put(conn.SourceIP)
-		t.ipPool.Put(conn.DestIP)
-	}
 	t.connections = nil
 	t.mutex.Unlock()
 }
@@ -381,3 +470,21 @@ func isValidFlagCombination(flags uint8) bool {
 
 	return true
 }
+
+func (t *TCPTracker) sendEvent(typ nftypes.Type, conn *TCPConnTrack, ruleID []byte) {
+	t.flowLogger.StoreEvent(nftypes.EventFields{
+		FlowID:     conn.FlowId,
+		Type:       typ,
+		RuleID:     ruleID,
+		Direction:  conn.Direction,
+		Protocol:   nftypes.TCP,
+		SourceIP:   conn.SourceIP,
+		DestIP:     conn.DestIP,
+		SourcePort: conn.SourcePort,
+		DestPort:   conn.DestPort,
+		RxPackets:  conn.PacketsRx.Load(),
+		TxPackets:  conn.PacketsTx.Load(),
+		RxBytes:    conn.BytesRx.Load(),
+		TxBytes:    conn.BytesTx.Load(),
+	})
+}

client/firewall/uspfilter/conntrack/tcp_test.go

@@ -1,7 +1,7 @@
 package conntrack
 
 import (
-	"net"
+	"net/netip"
 	"testing"
 	"time"
 
@@ -9,11 +9,11 @@ import (
 )
 
 func TestTCPStateMachine(t *testing.T) {
-	tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+	tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 	defer tracker.Close()
 
-	srcIP := net.ParseIP("100.64.0.1")
+	srcIP := netip.MustParseAddr("100.64.0.1")
-	dstIP := net.ParseIP("100.64.0.2")
+	dstIP := netip.MustParseAddr("100.64.0.2")
 	srcPort := uint16(12345)
 	dstPort := uint16(80)
 
@@ -58,7 +58,7 @@ func TestTCPStateMachine(t *testing.T) {
 
 		for _, tt := range tests {
 			t.Run(tt.name, func(t *testing.T) {
-				isValid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, tt.flags)
+				isValid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, tt.flags, 0)
 				require.Equal(t, !tt.wantDrop, isValid, tt.desc)
 			})
 		}
@@ -76,17 +76,17 @@ func TestTCPStateMachine(t *testing.T) {
 					t.Helper()
 
 					// Send initial SYN
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn, 0)
 
 					// Receive SYN-ACK
-					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck)
+					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck, 0)
 					require.True(t, valid, "SYN-ACK should be allowed")
 
 					// Send ACK
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck, 0)
 
 					// Test data transfer
-					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPPush|TCPAck)
+					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPPush|TCPAck, 0)
 					require.True(t, valid, "Data should be allowed after handshake")
 				},
 			},
@@ -99,18 +99,18 @@ func TestTCPStateMachine(t *testing.T) {
 					establishConnection(t, tracker, srcIP, dstIP, srcPort, dstPort)
 
 					// Send FIN
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPFin|TCPAck)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPFin|TCPAck, 0)
 
 					// Receive ACK for FIN
-					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPAck)
+					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPAck, 0)
 					require.True(t, valid, "ACK for FIN should be allowed")
 
 					// Receive FIN from other side
-					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPFin|TCPAck)
+					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPFin|TCPAck, 0)
 					require.True(t, valid, "FIN should be allowed")
 
 					// Send final ACK
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck, 0)
 				},
 			},
 			{
@@ -122,7 +122,7 @@ func TestTCPStateMachine(t *testing.T) {
 					establishConnection(t, tracker, srcIP, dstIP, srcPort, dstPort)
 
 					// Receive RST
-					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst)
+					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst, 0)
 					require.True(t, valid, "RST should be allowed for established connection")
 
 					// Connection is logically dead but we don't enforce blocking subsequent packets
@@ -138,13 +138,13 @@ func TestTCPStateMachine(t *testing.T) {
 					establishConnection(t, tracker, srcIP, dstIP, srcPort, dstPort)
 
 					// Both sides send FIN+ACK
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPFin|TCPAck)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPFin|TCPAck, 0)
-					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPFin|TCPAck)
+					valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPFin|TCPAck, 0)
 					require.True(t, valid, "Simultaneous FIN should be allowed")
 
 					// Both sides send final ACK
-					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck)
+					tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck, 0)
-					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPAck)
+					valid = tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPAck, 0)
 					require.True(t, valid, "Final ACKs should be allowed")
 				},
 			},
@@ -154,7 +154,7 @@ func TestTCPStateMachine(t *testing.T) {
 			t.Run(tt.name, func(t *testing.T) {
 				t.Helper()
 
-				tracker = NewTCPTracker(DefaultTCPTimeout, logger)
+				tracker = NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 				tt.test(t)
 			})
 		}
@@ -162,11 +162,11 @@ func TestTCPStateMachine(t *testing.T) {
 }
 
 func TestRSTHandling(t *testing.T) {
-	tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+	tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 	defer tracker.Close()
 
-	srcIP := net.ParseIP("100.64.0.1")
+	srcIP := netip.MustParseAddr("100.64.0.1")
-	dstIP := net.ParseIP("100.64.0.2")
+	dstIP := netip.MustParseAddr("100.64.0.2")
 	srcPort := uint16(12345)
 	dstPort := uint16(80)
 
@@ -181,12 +181,12 @@ func TestRSTHandling(t *testing.T) {
 			name: "RST in established",
 			setupState: func() {
 				// Establish connection first
-				tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn)
+				tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn, 0)
-				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck)
+				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck, 0)
-				tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck)
+				tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck, 0)
 			},
 			sendRST: func() {
-				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst)
+				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst, 0)
 			},
 			wantValid: true,
 			desc:      "Should accept RST for established connection",
@@ -195,7 +195,7 @@ func TestRSTHandling(t *testing.T) {
 			name:       "RST without connection",
 			setupState: func() {},
 			sendRST: func() {
-				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst)
+				tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPRst, 0)
 			},
 			wantValid: false,
 			desc:      "Should reject RST without connection",
@@ -208,7 +208,12 @@ func TestRSTHandling(t *testing.T) {
 			tt.sendRST()
 
 			// Verify connection state is as expected
-			key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
+			key := ConnKey{
+				SrcIP:   srcIP,
+				DstIP:   dstIP,
+				SrcPort: srcPort,
+				DstPort: dstPort,
+			}
 			conn := tracker.connections[key]
 			if tt.wantValid {
 				require.NotNil(t, conn)
@@ -220,63 +225,63 @@ func TestRSTHandling(t *testing.T) {
 }
 
 // Helper to establish a TCP connection
-func establishConnection(t *testing.T, tracker *TCPTracker, srcIP, dstIP net.IP, srcPort, dstPort uint16) {
+func establishConnection(t *testing.T, tracker *TCPTracker, srcIP, dstIP netip.Addr, srcPort, dstPort uint16) {
 	t.Helper()
 
-	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn)
+	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPSyn, 0)
 
-	valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck)
+	valid := tracker.IsValidInbound(dstIP, srcIP, dstPort, srcPort, TCPSyn|TCPAck, 0)
 	require.True(t, valid, "SYN-ACK should be allowed")
 
-	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck)
+	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, TCPAck, 0)
 }
 
 func BenchmarkTCPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80, TCPSyn)
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80, TCPSyn, 0)
 		}
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		// Pre-populate some connections
 		for i := 0; i < 1000; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80, TCPSyn)
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80, TCPSyn, 0)
 		}
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%1000), TCPAck)
+			tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%1000), TCPAck, 0)
 		}
 	})
 
 	b.Run("ConcurrentAccess", func(b *testing.B) {
-		tracker := NewTCPTracker(DefaultTCPTimeout, logger)
+		tracker := NewTCPTracker(DefaultTCPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		b.RunParallel(func(pb *testing.PB) {
 			i := 0
 			for pb.Next() {
 				if i%2 == 0 {
-					tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80, TCPSyn)
+					tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80, TCPSyn, 0)
 				} else {
-					tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%65535), TCPAck)
+					tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%65535), TCPAck, 0)
 				}
 				i++
 			}
@@ -287,14 +292,14 @@ func BenchmarkTCPTracker(b *testing.B) {
 // Benchmark connection cleanup
 func BenchmarkCleanup(b *testing.B) {
 	b.Run("TCPCleanup", func(b *testing.B) {
-		tracker := NewTCPTracker(100*time.Millisecond, logger) // Short timeout for testing
+		tracker := NewTCPTracker(100*time.Millisecond, logger, flowLogger) // Short timeout for testing
 		defer tracker.Close()
 
 		// Pre-populate with expired connections
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 		for i := 0; i < 10000; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80, TCPSyn)
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80, TCPSyn, 0)
 		}
 
 		// Wait for connections to expire

client/firewall/uspfilter/conntrack/udp.go

@@ -1,11 +1,15 @@
 package conntrack
 
 import (
-	"net"
+	"context"
+	"net/netip"
 	"sync"
 	"time"
 
+	"github.com/google/uuid"
+
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 const (
@@ -18,6 +22,8 @@ const (
 // UDPConnTrack represents a UDP connection state
 type UDPConnTrack struct {
 	BaseConnTrack
+	SourcePort uint16
+	DestPort   uint16
 }
 
 // UDPTracker manages UDP connection states
@@ -26,89 +32,125 @@ type UDPTracker struct {
 	connections   map[ConnKey]*UDPConnTrack
 	timeout       time.Duration
 	cleanupTicker *time.Ticker
+	tickerCancel  context.CancelFunc
 	mutex         sync.RWMutex
-	done          chan struct{}
+	flowLogger    nftypes.FlowLogger
-	ipPool        *PreallocatedIPs
 }
 
 // NewUDPTracker creates a new UDP connection tracker
-func NewUDPTracker(timeout time.Duration, logger *nblog.Logger) *UDPTracker {
+func NewUDPTracker(timeout time.Duration, logger *nblog.Logger, flowLogger nftypes.FlowLogger) *UDPTracker {
 	if timeout == 0 {
 		timeout = DefaultUDPTimeout
 	}
 
+	ctx, cancel := context.WithCancel(context.Background())
+
 	tracker := &UDPTracker{
 		logger:        logger,
 		connections:   make(map[ConnKey]*UDPConnTrack),
 		timeout:       timeout,
 		cleanupTicker: time.NewTicker(UDPCleanupInterval),
-		done:          make(chan struct{}),
+		tickerCancel:  cancel,
-		ipPool:        NewPreallocatedIPs(),
+		flowLogger:    flowLogger,
 	}
 
-	go tracker.cleanupRoutine()
+	go tracker.cleanupRoutine(ctx)
 	return tracker
 }
 
 // TrackOutbound records an outbound UDP connection
-func (t *UDPTracker) TrackOutbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16) {
+func (t *UDPTracker) TrackOutbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, size int) {
-	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
+	if _, exists := t.updateIfExists(dstIP, srcIP, dstPort, srcPort, nftypes.Egress, size); !exists {
-
+		// if (inverted direction) conn is not tracked, track this direction
-	t.mutex.Lock()
+		t.track(srcIP, dstIP, srcPort, dstPort, nftypes.Egress, nil, size)
-	conn, exists := t.connections[key]
-	if !exists {
-		srcIPCopy := t.ipPool.Get()
-		dstIPCopy := t.ipPool.Get()
-		copyIP(srcIPCopy, srcIP)
-		copyIP(dstIPCopy, dstIP)
-
-		conn = &UDPConnTrack{
-			BaseConnTrack: BaseConnTrack{
-				SourceIP:   srcIPCopy,
-				DestIP:     dstIPCopy,
-				SourcePort: srcPort,
-				DestPort:   dstPort,
-			},
 	}
-		conn.UpdateLastSeen()
-		t.connections[key] = conn
-
-		t.logger.Trace("New UDP connection: %v", conn)
-	}
-	t.mutex.Unlock()
-
-	conn.UpdateLastSeen()
 }
 
-// IsValidInbound checks if an inbound packet matches a tracked connection
+// TrackInbound records an inbound UDP connection
-func (t *UDPTracker) IsValidInbound(srcIP net.IP, dstIP net.IP, srcPort uint16, dstPort uint16) bool {
+func (t *UDPTracker) TrackInbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, ruleID []byte, size int) {
-	key := makeConnKey(dstIP, srcIP, dstPort, srcPort)
+	t.track(srcIP, dstIP, srcPort, dstPort, nftypes.Ingress, ruleID, size)
+}
+
+func (t *UDPTracker) updateIfExists(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, direction nftypes.Direction, size int) (ConnKey, bool) {
+	key := ConnKey{
+		SrcIP:   srcIP,
+		DstIP:   dstIP,
+		SrcPort: srcPort,
+		DstPort: dstPort,
+	}
 
 	t.mutex.RLock()
 	conn, exists := t.connections[key]
 	t.mutex.RUnlock()
 
-	if !exists {
+	if exists {
+		conn.UpdateLastSeen()
+		conn.UpdateCounters(direction, size)
+		return key, true
+	}
+
+	return key, false
+}
+
+// track is the common implementation for tracking both inbound and outbound connections
+func (t *UDPTracker) track(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, direction nftypes.Direction, ruleID []byte, size int) {
+	key, exists := t.updateIfExists(srcIP, dstIP, srcPort, dstPort, direction, size)
+	if exists {
+		return
+	}
+
+	conn := &UDPConnTrack{
+		BaseConnTrack: BaseConnTrack{
+			FlowId:    uuid.New(),
+			Direction: direction,
+			SourceIP:  srcIP,
+			DestIP:    dstIP,
+		},
+		SourcePort: srcPort,
+		DestPort:   dstPort,
+	}
+	conn.UpdateLastSeen()
+
+	t.mutex.Lock()
+	t.connections[key] = conn
+	t.mutex.Unlock()
+
+	t.logger.Trace("New %s UDP connection: %s", direction, key)
+	t.sendEvent(nftypes.TypeStart, conn, ruleID)
+}
+
+// IsValidInbound checks if an inbound packet matches a tracked connection
+func (t *UDPTracker) IsValidInbound(srcIP netip.Addr, dstIP netip.Addr, srcPort uint16, dstPort uint16, size int) bool {
+	key := ConnKey{
+		SrcIP:   dstIP,
+		DstIP:   srcIP,
+		SrcPort: dstPort,
+		DstPort: srcPort,
+	}
+
+	t.mutex.RLock()
+	conn, exists := t.connections[key]
+	t.mutex.RUnlock()
+
+	if !exists || conn.timeoutExceeded(t.timeout) {
 		return false
 	}
 
-	if conn.timeoutExceeded(t.timeout) {
+	conn.UpdateLastSeen()
-		return false
+	conn.UpdateCounters(nftypes.Ingress, size)
-	}
 
-	return ValidateIPs(MakeIPAddr(srcIP), conn.DestIP) &&
+	return true
-		ValidateIPs(MakeIPAddr(dstIP), conn.SourceIP) &&
-		conn.DestPort == srcPort &&
-		conn.SourcePort == dstPort
 }
 
 // cleanupRoutine periodically removes stale connections
-func (t *UDPTracker) cleanupRoutine() {
+func (t *UDPTracker) cleanupRoutine(ctx context.Context) {
+	defer t.cleanupTicker.Stop()
+
 	for {
 		select {
 		case <-t.cleanupTicker.C:
 			t.cleanup()
-		case <-t.done:
+		case <-ctx.Done():
 			return
 		}
 	}
@@ -120,44 +162,58 @@ func (t *UDPTracker) cleanup() {
 
 	for key, conn := range t.connections {
 		if conn.timeoutExceeded(t.timeout) {
-			t.ipPool.Put(conn.SourceIP)
-			t.ipPool.Put(conn.DestIP)
 			delete(t.connections, key)
 
-			t.logger.Trace("Removed UDP connection %v (timeout)", conn)
+			t.logger.Trace("Removed UDP connection %s (timeout) [in: %d Pkts/%d B out: %d Pkts/%d B]",
+				key, conn.PacketsRx.Load(), conn.BytesRx.Load(), conn.PacketsTx.Load(), conn.BytesTx.Load())
+			t.sendEvent(nftypes.TypeEnd, conn, nil)
 		}
 	}
 }
 
 // Close stops the cleanup routine and releases resources
 func (t *UDPTracker) Close() {
-	t.cleanupTicker.Stop()
+	t.tickerCancel()
-	close(t.done)
 
 	t.mutex.Lock()
-	for _, conn := range t.connections {
-		t.ipPool.Put(conn.SourceIP)
-		t.ipPool.Put(conn.DestIP)
-	}
 	t.connections = nil
 	t.mutex.Unlock()
 }
 
 // GetConnection safely retrieves a connection state
-func (t *UDPTracker) GetConnection(srcIP net.IP, srcPort uint16, dstIP net.IP, dstPort uint16) (*UDPConnTrack, bool) {
+func (t *UDPTracker) GetConnection(srcIP netip.Addr, srcPort uint16, dstIP netip.Addr, dstPort uint16) (*UDPConnTrack, bool) {
 	t.mutex.RLock()
 	defer t.mutex.RUnlock()
 
-	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
+	key := ConnKey{
-	conn, exists := t.connections[key]
+		SrcIP:   srcIP,
-	if !exists {
+		DstIP:   dstIP,
-		return nil, false
+		SrcPort: srcPort,
+		DstPort: dstPort,
 	}
-
+	conn, exists := t.connections[key]
-	return conn, true
+	return conn, exists
 }
 
 // Timeout returns the configured timeout duration for the tracker
 func (t *UDPTracker) Timeout() time.Duration {
 	return t.timeout
 }
+
+func (t *UDPTracker) sendEvent(typ nftypes.Type, conn *UDPConnTrack, ruleID []byte) {
+	t.flowLogger.StoreEvent(nftypes.EventFields{
+		FlowID:     conn.FlowId,
+		Type:       typ,
+		RuleID:     ruleID,
+		Direction:  conn.Direction,
+		Protocol:   nftypes.UDP,
+		SourceIP:   conn.SourceIP,
+		DestIP:     conn.DestIP,
+		SourcePort: conn.SourcePort,
+		DestPort:   conn.DestPort,
+		RxPackets:  conn.PacketsRx.Load(),
+		TxPackets:  conn.PacketsTx.Load(),
+		RxBytes:    conn.BytesRx.Load(),
+		TxBytes:    conn.BytesTx.Load(),
+	})
+}

client/firewall/uspfilter/conntrack/udp_test.go

@@ -1,7 +1,8 @@
 package conntrack
 
 import (
-	"net"
+	"context"
+	"net/netip"
 	"testing"
 	"time"
 
@@ -29,54 +30,59 @@ func TestNewUDPTracker(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			tracker := NewUDPTracker(tt.timeout, logger)
+			tracker := NewUDPTracker(tt.timeout, logger, flowLogger)
 			assert.NotNil(t, tracker)
 			assert.Equal(t, tt.wantTimeout, tracker.timeout)
 			assert.NotNil(t, tracker.connections)
 			assert.NotNil(t, tracker.cleanupTicker)
-			assert.NotNil(t, tracker.done)
+			assert.NotNil(t, tracker.tickerCancel)
 		})
 	}
 }
 
 func TestUDPTracker_TrackOutbound(t *testing.T) {
-	tracker := NewUDPTracker(DefaultUDPTimeout, logger)
+	tracker := NewUDPTracker(DefaultUDPTimeout, logger, flowLogger)
 	defer tracker.Close()
 
-	srcIP := net.ParseIP("192.168.1.2")
+	srcIP := netip.MustParseAddr("192.168.1.2")
-	dstIP := net.ParseIP("192.168.1.3")
+	dstIP := netip.MustParseAddr("192.168.1.3")
 	srcPort := uint16(12345)
 	dstPort := uint16(53)
 
-	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort)
+	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, 0)
 
 	// Verify connection was tracked
-	key := makeConnKey(srcIP, dstIP, srcPort, dstPort)
+	key := ConnKey{
+		SrcIP:   srcIP,
+		DstIP:   dstIP,
+		SrcPort: srcPort,
+		DstPort: dstPort,
+	}
 	conn, exists := tracker.connections[key]
 	require.True(t, exists)
-	assert.True(t, conn.SourceIP.Equal(srcIP))
+	assert.True(t, conn.SourceIP.Compare(srcIP) == 0)
-	assert.True(t, conn.DestIP.Equal(dstIP))
+	assert.True(t, conn.DestIP.Compare(dstIP) == 0)
 	assert.Equal(t, srcPort, conn.SourcePort)
 	assert.Equal(t, dstPort, conn.DestPort)
 	assert.WithinDuration(t, time.Now(), conn.GetLastSeen(), 1*time.Second)
 }
 
 func TestUDPTracker_IsValidInbound(t *testing.T) {
-	tracker := NewUDPTracker(1*time.Second, logger)
+	tracker := NewUDPTracker(1*time.Second, logger, flowLogger)
 	defer tracker.Close()
 
-	srcIP := net.ParseIP("192.168.1.2")
+	srcIP := netip.MustParseAddr("192.168.1.2")
-	dstIP := net.ParseIP("192.168.1.3")
+	dstIP := netip.MustParseAddr("192.168.1.3")
 	srcPort := uint16(12345)
 	dstPort := uint16(53)
 
 	// Track outbound connection
-	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort)
+	tracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, 0)
 
 	tests := []struct {
 		name    string
-		srcIP   net.IP
+		srcIP   netip.Addr
-		dstIP   net.IP
+		dstIP   netip.Addr
 		srcPort uint16
 		dstPort uint16
 		sleep   time.Duration
@@ -93,7 +99,7 @@ func TestUDPTracker_IsValidInbound(t *testing.T) {
 		},
 		{
 			name:    "invalid source IP",
-			srcIP:   net.ParseIP("192.168.1.4"),
+			srcIP:   netip.MustParseAddr("192.168.1.4"),
 			dstIP:   srcIP,
 			srcPort: dstPort,
 			dstPort: srcPort,
@@ -103,7 +109,7 @@ func TestUDPTracker_IsValidInbound(t *testing.T) {
 		{
 			name:    "invalid destination IP",
 			srcIP:   dstIP,
-			dstIP:   net.ParseIP("192.168.1.4"),
+			dstIP:   netip.MustParseAddr("192.168.1.4"),
 			srcPort: dstPort,
 			dstPort: srcPort,
 			sleep:   0,
@@ -143,7 +149,7 @@ func TestUDPTracker_IsValidInbound(t *testing.T) {
 			if tt.sleep > 0 {
 				time.Sleep(tt.sleep)
 			}
-			got := tracker.IsValidInbound(tt.srcIP, tt.dstIP, tt.srcPort, tt.dstPort)
+			got := tracker.IsValidInbound(tt.srcIP, tt.dstIP, tt.srcPort, tt.dstPort, 0)
 			assert.Equal(t, tt.want, got)
 		})
 	}
@@ -154,42 +160,45 @@ func TestUDPTracker_Cleanup(t *testing.T) {
 	timeout := 50 * time.Millisecond
 	cleanupInterval := 25 * time.Millisecond
 
+	ctx, tickerCancel := context.WithCancel(context.Background())
+	defer tickerCancel()
+
 	// Create tracker with custom cleanup interval
 	tracker := &UDPTracker{
 		connections:   make(map[ConnKey]*UDPConnTrack),
 		timeout:       timeout,
 		cleanupTicker: time.NewTicker(cleanupInterval),
-		done:          make(chan struct{}),
+		tickerCancel:  tickerCancel,
-		ipPool:        NewPreallocatedIPs(),
 		logger:        logger,
+		flowLogger:    flowLogger,
 	}
 
 	// Start cleanup routine
-	go tracker.cleanupRoutine()
+	go tracker.cleanupRoutine(ctx)
 
 	// Add some connections
 	connections := []struct {
-		srcIP   net.IP
+		srcIP   netip.Addr
-		dstIP   net.IP
+		dstIP   netip.Addr
 		srcPort uint16
 		dstPort uint16
 	}{
 		{
-			srcIP:   net.ParseIP("192.168.1.2"),
+			srcIP:   netip.MustParseAddr("192.168.1.2"),
-			dstIP:   net.ParseIP("192.168.1.3"),
+			dstIP:   netip.MustParseAddr("192.168.1.3"),
 			srcPort: 12345,
 			dstPort: 53,
 		},
 		{
-			srcIP:   net.ParseIP("192.168.1.4"),
+			srcIP:   netip.MustParseAddr("192.168.1.4"),
-			dstIP:   net.ParseIP("192.168.1.5"),
+			dstIP:   netip.MustParseAddr("192.168.1.5"),
 			srcPort: 12346,
 			dstPort: 53,
 		},
 	}
 
 	for _, conn := range connections {
-		tracker.TrackOutbound(conn.srcIP, conn.dstIP, conn.srcPort, conn.dstPort)
+		tracker.TrackOutbound(conn.srcIP, conn.dstIP, conn.srcPort, conn.dstPort, 0)
 	}
 
 	// Verify initial connections
@@ -211,33 +220,33 @@ func TestUDPTracker_Cleanup(t *testing.T) {
 
 func BenchmarkUDPTracker(b *testing.B) {
 	b.Run("TrackOutbound", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80)
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i%65535), 80, 0)
 		}
 	})
 
 	b.Run("IsValidInbound", func(b *testing.B) {
-		tracker := NewUDPTracker(DefaultUDPTimeout, logger)
+		tracker := NewUDPTracker(DefaultUDPTimeout, logger, flowLogger)
 		defer tracker.Close()
 
-		srcIP := net.ParseIP("192.168.1.1")
+		srcIP := netip.MustParseAddr("192.168.1.1")
-		dstIP := net.ParseIP("192.168.1.2")
+		dstIP := netip.MustParseAddr("192.168.1.2")
 
 		// Pre-populate some connections
 		for i := 0; i < 1000; i++ {
-			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80)
+			tracker.TrackOutbound(srcIP, dstIP, uint16(i), 80, 0)
 		}
 
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%1000))
+			tracker.IsValidInbound(dstIP, srcIP, 80, uint16(i%1000), 0)
 		}
 	})
 }

client/firewall/uspfilter/forwarder/endpoint.go

@@ -1,6 +1,8 @@
 package forwarder
 
 import (
+	"fmt"
+
 	wgdevice "golang.zx2c4.com/wireguard/device"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
@@ -79,3 +81,10 @@ func (e *endpoint) AddHeader(*stack.PacketBuffer) {
 func (e *endpoint) ParseHeader(*stack.PacketBuffer) bool {
 	return true
 }
+
+type epID stack.TransportEndpointID
+
+func (i epID) String() string {
+	// src and remote is swapped
+	return fmt.Sprintf("%s:%d -> %s:%d", i.RemoteAddress, i.RemotePort, i.LocalAddress, i.LocalPort)
+}

client/firewall/uspfilter/forwarder/forwarder.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/common"
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 const (
@@ -29,6 +30,7 @@ const (
 
 type Forwarder struct {
 	logger       *nblog.Logger
+	flowLogger   nftypes.FlowLogger
 	stack        *stack.Stack
 	endpoint     *endpoint
 	udpForwarder *udpForwarder
@@ -38,7 +40,7 @@ type Forwarder struct {
 	netstack     bool
 }
 
-func New(iface common.IFaceMapper, logger *nblog.Logger, netstack bool) (*Forwarder, error) {
+func New(iface common.IFaceMapper, logger *nblog.Logger, flowLogger nftypes.FlowLogger, netstack bool) (*Forwarder, error) {
 	s := stack.New(stack.Options{
 		NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol},
 		TransportProtocols: []stack.TransportProtocolFactory{
@@ -102,9 +104,10 @@ func New(iface common.IFaceMapper, logger *nblog.Logger, netstack bool) (*Forwar
 	ctx, cancel := context.WithCancel(context.Background())
 	f := &Forwarder{
 		logger:       logger,
+		flowLogger:   flowLogger,
 		stack:        s,
 		endpoint:     endpoint,
-		udpForwarder: newUDPForwarder(mtu, logger),
+		udpForwarder: newUDPForwarder(mtu, logger, flowLogger),
 		ctx:          ctx,
 		cancel:       cancel,
 		netstack:     netstack,

client/firewall/uspfilter/forwarder/icmp.go

@@ -3,14 +3,30 @@ package forwarder
 import (
 	"context"
 	"net"
+	"net/netip"
 	"time"
 
+	"github.com/google/uuid"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
+
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 // handleICMP handles ICMP packets from the network stack
 func (f *Forwarder) handleICMP(id stack.TransportEndpointID, pkt stack.PacketBufferPtr) bool {
+	icmpHdr := header.ICMPv4(pkt.TransportHeader().View().AsSlice())
+	icmpType := uint8(icmpHdr.Type())
+	icmpCode := uint8(icmpHdr.Code())
+
+	if header.ICMPv4Type(icmpType) == header.ICMPv4EchoReply {
+		// dont process our own replies
+		return true
+	}
+
+	flowID := uuid.New()
+	f.sendICMPEvent(nftypes.TypeStart, flowID, id, icmpType, icmpCode)
+
 	ctx, cancel := context.WithTimeout(f.ctx, 5*time.Second)
 	defer cancel()
 
@@ -18,7 +34,7 @@ func (f *Forwarder) handleICMP(id stack.TransportEndpointID, pkt stack.PacketBuf
 	// TODO: support non-root
 	conn, err := lc.ListenPacket(ctx, "ip4:icmp", "0.0.0.0")
 	if err != nil {
-		f.logger.Error("Failed to create ICMP socket for %v: %v", id, err)
+		f.logger.Error("Failed to create ICMP socket for %v: %v", epID(id), err)
 
 		// This will make netstack reply on behalf of the original destination, that's ok for now
 		return false
@@ -32,47 +48,31 @@ func (f *Forwarder) handleICMP(id stack.TransportEndpointID, pkt stack.PacketBuf
 	dstIP := f.determineDialAddr(id.LocalAddress)
 	dst := &net.IPAddr{IP: dstIP}
 
-	// Get the complete ICMP message (header + data)
 	fullPacket := stack.PayloadSince(pkt.TransportHeader())
 	payload := fullPacket.AsSlice()
 
-	icmpHdr := header.ICMPv4(pkt.TransportHeader().View().AsSlice())
+	if _, err = conn.WriteTo(payload, dst); err != nil {
+		f.logger.Error("Failed to write ICMP packet for %v: %v", epID(id), err)
+		return true
+	}
+
+	f.logger.Trace("Forwarded ICMP packet %v type %v code %v",
+		epID(id), icmpHdr.Type(), icmpHdr.Code())
 
 	// For Echo Requests, send and handle response
-	switch icmpHdr.Type() {
+	if header.ICMPv4Type(icmpType) == header.ICMPv4Echo {
-	case header.ICMPv4Echo:
+		f.handleEchoResponse(icmpHdr, conn, id)
-		return f.handleEchoResponse(icmpHdr, payload, dst, conn, id)
+		f.sendICMPEvent(nftypes.TypeEnd, flowID, id, icmpType, icmpCode)
-	case header.ICMPv4EchoReply:
-		// dont process our own replies
-		return true
-	default:
 	}
 
-	// For other ICMP types (Time Exceeded, Destination Unreachable, etc)
+	// For other ICMP types (Time Exceeded, Destination Unreachable, etc) do nothing
-	_, err = conn.WriteTo(payload, dst)
-	if err != nil {
-		f.logger.Error("Failed to write ICMP packet for %v: %v", id, err)
-		return true
-	}
-
-	f.logger.Trace("Forwarded ICMP packet %v type=%v code=%v",
-		id, icmpHdr.Type(), icmpHdr.Code())
-
 	return true
 }
 
-func (f *Forwarder) handleEchoResponse(icmpHdr header.ICMPv4, payload []byte, dst *net.IPAddr, conn net.PacketConn, id stack.TransportEndpointID) bool {
+func (f *Forwarder) handleEchoResponse(icmpHdr header.ICMPv4, conn net.PacketConn, id stack.TransportEndpointID) {
-	if _, err := conn.WriteTo(payload, dst); err != nil {
-		f.logger.Error("Failed to write ICMP packet for %v: %v", id, err)
-		return true
-	}
-
-	f.logger.Trace("Forwarded ICMP packet %v type=%v code=%v",
-		id, icmpHdr.Type(), icmpHdr.Code())
-
 	if err := conn.SetReadDeadline(time.Now().Add(5 * time.Second)); err != nil {
 		f.logger.Error("Failed to set read deadline for ICMP response: %v", err)
-		return true
+		return
 	}
 
 	response := make([]byte, f.endpoint.mtu)
@@ -81,7 +81,7 @@ func (f *Forwarder) handleEchoResponse(icmpHdr header.ICMPv4, payload []byte, ds
 		if !isTimeout(err) {
 			f.logger.Error("Failed to read ICMP response: %v", err)
 		}
-		return true
+		return
 	}
 
 	ipHdr := make([]byte, header.IPv4MinimumSize)
@@ -101,9 +101,27 @@ func (f *Forwarder) handleEchoResponse(icmpHdr header.ICMPv4, payload []byte, ds
 
 	if err := f.InjectIncomingPacket(fullPacket); err != nil {
 		f.logger.Error("Failed to inject ICMP response: %v", err)
-		return true
+
+		return
 	}
 
-	f.logger.Trace("Forwarded ICMP echo reply for %v", id)
+	f.logger.Trace("Forwarded ICMP echo reply for %v type %v code %v",
-	return true
+		epID(id), icmpHdr.Type(), icmpHdr.Code())
+}
+
+// sendICMPEvent stores flow events for ICMP packets
+func (f *Forwarder) sendICMPEvent(typ nftypes.Type, flowID uuid.UUID, id stack.TransportEndpointID, icmpType, icmpCode uint8) {
+	f.flowLogger.StoreEvent(nftypes.EventFields{
+		FlowID:    flowID,
+		Type:      typ,
+		Direction: nftypes.Ingress,
+		Protocol:  nftypes.ICMP,
+		// TODO: handle ipv6
+		SourceIP: netip.AddrFrom4(id.RemoteAddress.As4()),
+		DestIP:   netip.AddrFrom4(id.LocalAddress.As4()),
+		ICMPType: icmpType,
+		ICMPCode: icmpCode,
+
+		// TODO: get packets/bytes
+	})
 }

client/firewall/uspfilter/forwarder/tcp.go

@@ -5,24 +5,38 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"net/netip"
 
+	"github.com/google/uuid"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 	"gvisor.dev/gvisor/pkg/waiter"
+
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 // handleTCP is called by the TCP forwarder for new connections.
 func (f *Forwarder) handleTCP(r *tcp.ForwarderRequest) {
 	id := r.ID()
 
+	flowID := uuid.New()
+
+	f.sendTCPEvent(nftypes.TypeStart, flowID, id, nil)
+	var success bool
+	defer func() {
+		if !success {
+			f.sendTCPEvent(nftypes.TypeEnd, flowID, id, nil)
+		}
+	}()
+
 	dialAddr := fmt.Sprintf("%s:%d", f.determineDialAddr(id.LocalAddress), id.LocalPort)
 
 	outConn, err := (&net.Dialer{}).DialContext(f.ctx, "tcp", dialAddr)
 	if err != nil {
 		r.Complete(true)
-		f.logger.Trace("forwarder: dial error for %v: %v", id, err)
+		f.logger.Trace("forwarder: dial error for %v: %v", epID(id), err)
 		return
 	}
 
@@ -44,12 +58,13 @@ func (f *Forwarder) handleTCP(r *tcp.ForwarderRequest) {
 
 	inConn := gonet.NewTCPConn(&wq, ep)
 
-	f.logger.Trace("forwarder: established TCP connection %v", id)
+	success = true
+	f.logger.Trace("forwarder: established TCP connection %v", epID(id))
 
-	go f.proxyTCP(id, inConn, outConn, ep)
+	go f.proxyTCP(id, inConn, outConn, ep, flowID)
 }
 
-func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn, outConn net.Conn, ep tcpip.Endpoint) {
+func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn, outConn net.Conn, ep tcpip.Endpoint, flowID uuid.UUID) {
 	defer func() {
 		if err := inConn.Close(); err != nil {
 			f.logger.Debug("forwarder: inConn close error: %v", err)
@@ -58,6 +73,8 @@ func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn
 			f.logger.Debug("forwarder: outConn close error: %v", err)
 		}
 		ep.Close()
+
+		f.sendTCPEvent(nftypes.TypeEnd, flowID, id, ep)
 	}()
 
 	// Create context for managing the proxy goroutines
@@ -78,13 +95,38 @@ func (f *Forwarder) proxyTCP(id stack.TransportEndpointID, inConn *gonet.TCPConn
 
 	select {
 	case <-ctx.Done():
-		f.logger.Trace("forwarder: tearing down TCP connection %v due to context done", id)
+		f.logger.Trace("forwarder: tearing down TCP connection %v due to context done", epID(id))
 		return
 	case err := <-errChan:
 		if err != nil && !isClosedError(err) {
 			f.logger.Error("proxyTCP: copy error: %v", err)
 		}
-		f.logger.Trace("forwarder: tearing down TCP connection %v", id)
+		f.logger.Trace("forwarder: tearing down TCP connection %v", epID(id))
 		return
 	}
 }
+
+func (f *Forwarder) sendTCPEvent(typ nftypes.Type, flowID uuid.UUID, id stack.TransportEndpointID, ep tcpip.Endpoint) {
+	fields := nftypes.EventFields{
+		FlowID:    flowID,
+		Type:      typ,
+		Direction: nftypes.Ingress,
+		Protocol:  nftypes.TCP,
+		// TODO: handle ipv6
+		SourceIP:   netip.AddrFrom4(id.RemoteAddress.As4()),
+		DestIP:     netip.AddrFrom4(id.LocalAddress.As4()),
+		SourcePort: id.RemotePort,
+		DestPort:   id.LocalPort,
+	}
+
+	if ep != nil {
+		if tcpStats, ok := ep.Stats().(*tcp.Stats); ok {
+			// fields are flipped since this is the in conn
+			// TODO: get bytes
+			fields.RxPackets = tcpStats.SegmentsSent.Value()
+			fields.TxPackets = tcpStats.SegmentsReceived.Value()
+		}
+	}
+
+	f.flowLogger.StoreEvent(fields)
+}

client/firewall/uspfilter/forwarder/udp.go

@@ -5,10 +5,12 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/netip"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/google/uuid"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -16,6 +18,7 @@ import (
 	"gvisor.dev/gvisor/pkg/waiter"
 
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 )
 
 const (
@@ -28,11 +31,13 @@ type udpPacketConn struct {
 	lastSeen atomic.Int64
 	cancel   context.CancelFunc
 	ep       tcpip.Endpoint
+	flowID   uuid.UUID
 }
 
 type udpForwarder struct {
 	sync.RWMutex
 	logger     *nblog.Logger
+	flowLogger nftypes.FlowLogger
 	conns      map[stack.TransportEndpointID]*udpPacketConn
 	bufPool    sync.Pool
 	ctx        context.Context
@@ -44,10 +49,11 @@ type idleConn struct {
 	conn *udpPacketConn
 }
 
-func newUDPForwarder(mtu int, logger *nblog.Logger) *udpForwarder {
+func newUDPForwarder(mtu int, logger *nblog.Logger, flowLogger nftypes.FlowLogger) *udpForwarder {
 	ctx, cancel := context.WithCancel(context.Background())
 	f := &udpForwarder{
 		logger:     logger,
+		flowLogger: flowLogger,
 		conns:      make(map[stack.TransportEndpointID]*udpPacketConn),
 		ctx:        ctx,
 		cancel:     cancel,
@@ -72,10 +78,10 @@ func (f *udpForwarder) Stop() {
 	for id, conn := range f.conns {
 		conn.cancel()
 		if err := conn.conn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP conn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP conn close error for %v: %v", epID(id), err)
 		}
 		if err := conn.outConn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", epID(id), err)
 		}
 
 		conn.ep.Close()
@@ -106,10 +112,10 @@ func (f *udpForwarder) cleanup() {
 			for _, idle := range idleConns {
 				idle.conn.cancel()
 				if err := idle.conn.conn.Close(); err != nil {
-					f.logger.Debug("forwarder: UDP conn close error for %v: %v", idle.id, err)
+					f.logger.Debug("forwarder: UDP conn close error for %v: %v", epID(idle.id), err)
 				}
 				if err := idle.conn.outConn.Close(); err != nil {
-					f.logger.Debug("forwarder: UDP outConn close error for %v: %v", idle.id, err)
+					f.logger.Debug("forwarder: UDP outConn close error for %v: %v", epID(idle.id), err)
 				}
 
 				idle.conn.ep.Close()
@@ -118,7 +124,7 @@ func (f *udpForwarder) cleanup() {
 				delete(f.conns, idle.id)
 				f.Unlock()
 
-				f.logger.Trace("forwarder: cleaned up idle UDP connection %v", idle.id)
+				f.logger.Trace("forwarder: cleaned up idle UDP connection %v", epID(idle.id))
 			}
 		}
 	}
@@ -137,14 +143,24 @@ func (f *Forwarder) handleUDP(r *udp.ForwarderRequest) {
 	_, exists := f.udpForwarder.conns[id]
 	f.udpForwarder.RUnlock()
 	if exists {
-		f.logger.Trace("forwarder: existing UDP connection for %v", id)
+		f.logger.Trace("forwarder: existing UDP connection for %v", epID(id))
 		return
 	}
 
+	flowID := uuid.New()
+
+	f.sendUDPEvent(nftypes.TypeStart, flowID, id, nil)
+	var success bool
+	defer func() {
+		if !success {
+			f.sendUDPEvent(nftypes.TypeEnd, flowID, id, nil)
+		}
+	}()
+
 	dstAddr := fmt.Sprintf("%s:%d", f.determineDialAddr(id.LocalAddress), id.LocalPort)
 	outConn, err := (&net.Dialer{}).DialContext(f.ctx, "udp", dstAddr)
 	if err != nil {
-		f.logger.Debug("forwarder: UDP dial error for %v: %v", id, err)
+		f.logger.Debug("forwarder: UDP dial error for %v: %v", epID(id), err)
 		// TODO: Send ICMP error message
 		return
 	}
@@ -155,7 +171,7 @@ func (f *Forwarder) handleUDP(r *udp.ForwarderRequest) {
 	if epErr != nil {
 		f.logger.Debug("forwarder: failed to create UDP endpoint: %v", epErr)
 		if err := outConn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", epID(id), err)
 		}
 		return
 	}
@@ -168,6 +184,7 @@ func (f *Forwarder) handleUDP(r *udp.ForwarderRequest) {
 		outConn: outConn,
 		cancel:  connCancel,
 		ep:      ep,
+		flowID:  flowID,
 	}
 	pConn.updateLastSeen()
 
@@ -177,17 +194,20 @@ func (f *Forwarder) handleUDP(r *udp.ForwarderRequest) {
 		f.udpForwarder.Unlock()
 		pConn.cancel()
 		if err := inConn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", epID(id), err)
 		}
 		if err := outConn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", epID(id), err)
 		}
+
 		return
 	}
 	f.udpForwarder.conns[id] = pConn
 	f.udpForwarder.Unlock()
 
-	f.logger.Trace("forwarder: established UDP connection to %v", id)
+	success = true
+	f.logger.Trace("forwarder: established UDP connection %v", epID(id))
+
 	go f.proxyUDP(connCtx, pConn, id, ep)
 }
 
@@ -195,10 +215,10 @@ func (f *Forwarder) proxyUDP(ctx context.Context, pConn *udpPacketConn, id stack
 	defer func() {
 		pConn.cancel()
 		if err := pConn.conn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP inConn close error for %v: %v", epID(id), err)
 		}
 		if err := pConn.outConn.Close(); err != nil {
-			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", id, err)
+			f.logger.Debug("forwarder: UDP outConn close error for %v: %v", epID(id), err)
 		}
 
 		ep.Close()
@@ -206,6 +226,8 @@ func (f *Forwarder) proxyUDP(ctx context.Context, pConn *udpPacketConn, id stack
 		f.udpForwarder.Lock()
 		delete(f.udpForwarder.conns, id)
 		f.udpForwarder.Unlock()
+
+		f.sendUDPEvent(nftypes.TypeEnd, pConn.flowID, id, ep)
 	}()
 
 	errChan := make(chan error, 2)
@@ -220,17 +242,43 @@ func (f *Forwarder) proxyUDP(ctx context.Context, pConn *udpPacketConn, id stack
 
 	select {
 	case <-ctx.Done():
-		f.logger.Trace("forwarder: tearing down UDP connection %v due to context done", id)
+		f.logger.Trace("forwarder: tearing down UDP connection %v due to context done", epID(id))
 		return
 	case err := <-errChan:
 		if err != nil && !isClosedError(err) {
 			f.logger.Error("proxyUDP: copy error: %v", err)
 		}
-		f.logger.Trace("forwarder: tearing down UDP connection %v", id)
+		f.logger.Trace("forwarder: tearing down UDP connection %v", epID(id))
 		return
 	}
 }
 
+// sendUDPEvent stores flow events for UDP connections
+func (f *Forwarder) sendUDPEvent(typ nftypes.Type, flowID uuid.UUID, id stack.TransportEndpointID, ep tcpip.Endpoint) {
+	fields := nftypes.EventFields{
+		FlowID:    flowID,
+		Type:      typ,
+		Direction: nftypes.Ingress,
+		Protocol:  nftypes.UDP,
+		// TODO: handle ipv6
+		SourceIP:   netip.AddrFrom4(id.RemoteAddress.As4()),
+		DestIP:     netip.AddrFrom4(id.LocalAddress.As4()),
+		SourcePort: id.RemotePort,
+		DestPort:   id.LocalPort,
+	}
+
+	if ep != nil {
+		if tcpStats, ok := ep.Stats().(*tcpip.TransportEndpointStats); ok {
+			// fields are flipped since this is the in conn
+			// TODO: get bytes
+			fields.RxPackets = tcpStats.PacketsSent.Value()
+			fields.TxPackets = tcpStats.PacketsReceived.Value()
+		}
+	}
+
+	f.flowLogger.StoreEvent(fields)
+}
+
 func (c *udpPacketConn) updateLastSeen() {
 	c.lastSeen.Store(time.Now().UnixNano())
 }

client/firewall/uspfilter/localip.go

@@ -3,6 +3,7 @@ package uspfilter
 import (
 	"fmt"
 	"net"
+	"net/netip"
 	"sync"
 
 	log "github.com/sirupsen/logrus"
@@ -31,13 +32,9 @@ func (m *localIPManager) setBitmapBit(ip net.IP) {
 	m.ipv4Bitmap[high] |= 1 << (low % 32)
 }
 
-func (m *localIPManager) checkBitmapBit(ip net.IP) bool {
+func (m *localIPManager) checkBitmapBit(ip []byte) bool {
-	ipv4 := ip.To4()
+	high := (uint16(ip[0]) << 8) | uint16(ip[1])
-	if ipv4 == nil {
+	low := (uint16(ip[2]) << 8) | uint16(ip[3])
-		return false
-	}
-	high := (uint16(ipv4[0]) << 8) | uint16(ipv4[1])
-	low := (uint16(ipv4[2]) << 8) | uint16(ipv4[3])
 	return (m.ipv4Bitmap[high] & (1 << (low % 32))) != 0
 }
 
@@ -122,12 +119,12 @@ func (m *localIPManager) UpdateLocalIPs(iface common.IFaceMapper) (err error) {
 	return nil
 }
 
-func (m *localIPManager) IsLocalIP(ip net.IP) bool {
+func (m *localIPManager) IsLocalIP(ip netip.Addr) bool {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
-	if ipv4 := ip.To4(); ipv4 != nil {
+	if ip.Is4() {
-		return m.checkBitmapBit(ipv4)
+		return m.checkBitmapBit(ip.AsSlice())
 	}
 
 	return false

client/firewall/uspfilter/localip_test.go

@@ -2,90 +2,91 @@ package uspfilter
 
 import (
 	"net"
+	"net/netip"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 func TestLocalIPManager(t *testing.T) {
 	tests := []struct {
 		name      string
-		setupAddr iface.WGAddress
+		setupAddr wgaddr.Address
-		testIP    net.IP
+		testIP    netip.Addr
 		expected  bool
 	}{
 		{
 			name: "Localhost range",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("192.168.1.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("192.168.1.0"),
 					Mask: net.CIDRMask(24, 32),
 				},
 			},
-			testIP:   net.ParseIP("127.0.0.2"),
+			testIP:   netip.MustParseAddr("127.0.0.2"),
 			expected: true,
 		},
 		{
 			name: "Localhost standard address",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("192.168.1.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("192.168.1.0"),
 					Mask: net.CIDRMask(24, 32),
 				},
 			},
-			testIP:   net.ParseIP("127.0.0.1"),
+			testIP:   netip.MustParseAddr("127.0.0.1"),
 			expected: true,
 		},
 		{
 			name: "Localhost range edge",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("192.168.1.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("192.168.1.0"),
 					Mask: net.CIDRMask(24, 32),
 				},
 			},
-			testIP:   net.ParseIP("127.255.255.255"),
+			testIP:   netip.MustParseAddr("127.255.255.255"),
 			expected: true,
 		},
 		{
 			name: "Local IP matches",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("192.168.1.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("192.168.1.0"),
 					Mask: net.CIDRMask(24, 32),
 				},
 			},
-			testIP:   net.ParseIP("192.168.1.1"),
+			testIP:   netip.MustParseAddr("192.168.1.1"),
 			expected: true,
 		},
 		{
 			name: "Local IP doesn't match",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("192.168.1.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("192.168.1.0"),
 					Mask: net.CIDRMask(24, 32),
 				},
 			},
-			testIP:   net.ParseIP("192.168.1.2"),
+			testIP:   netip.MustParseAddr("192.168.1.2"),
 			expected: false,
 		},
 		{
 			name: "IPv6 address",
-			setupAddr: iface.WGAddress{
+			setupAddr: wgaddr.Address{
 				IP: net.ParseIP("fe80::1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("fe80::"),
 					Mask: net.CIDRMask(64, 128),
 				},
 			},
-			testIP:   net.ParseIP("fe80::1"),
+			testIP:   netip.MustParseAddr("fe80::1"),
 			expected: false,
 		},
 	}
@@ -95,7 +96,7 @@ func TestLocalIPManager(t *testing.T) {
 			manager := newLocalIPManager()
 
 			mock := &IFaceMock{
-				AddressFunc: func() iface.WGAddress {
+				AddressFunc: func() wgaddr.Address {
 					return tt.setupAddr
 				},
 			}
@@ -174,7 +175,7 @@ func TestLocalIPManager_AllInterfaces(t *testing.T) {
 	t.Logf("Testing %d IPs", len(tests))
 	for _, tt := range tests {
 		t.Run(tt.ip, func(t *testing.T) {
-			result := manager.IsLocalIP(net.ParseIP(tt.ip))
+			result := manager.IsLocalIP(netip.MustParseAddr(tt.ip))
 			require.Equal(t, tt.expected, result, "IP: %s", tt.ip)
 		})
 	}

client/firewall/uspfilter/log/log.go

@@ -1,4 +1,4 @@
-// Package logger provides a high-performance, non-blocking logger for userspace networking
+// Package log provides a high-performance, non-blocking logger for userspace networking
 package log
 
 import (
@@ -13,13 +13,12 @@ import (
 )
 
 const (
-	maxBatchSize         = 1024 * 16  // 16KB max batch size
+	maxBatchSize         = 1024 * 16
-	maxMessageSize       = 1024 * 2   // 2KB per message
+	maxMessageSize       = 1024 * 2
-	bufferSize           = 1024 * 256 // 256KB ring buffer
 	defaultFlushInterval = 2 * time.Second
+	logChannelSize       = 1000
 )
 
-// Level represents log severity
 type Level uint32
 
 const (
@@ -42,32 +41,37 @@ var levelStrings = map[Level]string{
 	LevelTrace: "TRAC",
 }
 
+type logMessage struct {
+	level  Level
+	format string
+	args   []any
+}
+
 // Logger is a high-performance, non-blocking logger
 type Logger struct {
 	output     io.Writer
 	level      atomic.Uint32
-	buffer    *ringBuffer
+	msgChannel chan logMessage
 	shutdown   chan struct{}
 	closeOnce  sync.Once
 	wg         sync.WaitGroup
-
-	// Reusable buffer pool for formatting messages
 	bufPool    sync.Pool
 }
 
+// NewFromLogrus creates a new Logger that writes to the same output as the given logrus logger
 func NewFromLogrus(logrusLogger *log.Logger) *Logger {
 	l := &Logger{
 		output:     logrusLogger.Out,
-		buffer:   newRingBuffer(bufferSize),
+		msgChannel: make(chan logMessage, logChannelSize),
 		shutdown:   make(chan struct{}),
 		bufPool: sync.Pool{
-			New: func() interface{} {
+			New: func() any {
-				// Pre-allocate buffer for message formatting
 				b := make([]byte, 0, maxMessageSize)
 				return &b
 			},
 		},
 	}
+
 	logrusLevel := logrusLogger.GetLevel()
 	l.level.Store(uint32(logrusLevel))
 	level := levelStrings[Level(logrusLevel)]
@@ -79,97 +83,149 @@ func NewFromLogrus(logrusLogger *log.Logger) *Logger {
 	return l
 }
 
+// SetLevel sets the logging level
 func (l *Logger) SetLevel(level Level) {
 	l.level.Store(uint32(level))
-
 	log.Debugf("Set uspfilter logger loglevel to %v", levelStrings[level])
 }
 
-func (l *Logger) formatMessage(buf *[]byte, level Level, format string, args ...interface{}) {
+func (l *Logger) log(level Level, format string, args ...any) {
-	*buf = (*buf)[:0]
+	select {
-
+	case l.msgChannel <- logMessage{level: level, format: format, args: args}:
-	// Timestamp
+	default:
-	*buf = time.Now().AppendFormat(*buf, "2006-01-02T15:04:05-07:00")
-	*buf = append(*buf, ' ')
-
-	// Level
-	*buf = append(*buf, levelStrings[level]...)
-	*buf = append(*buf, ' ')
-
-	// Message
-	if len(args) > 0 {
-		*buf = append(*buf, fmt.Sprintf(format, args...)...)
-	} else {
-		*buf = append(*buf, format...)
 	}
-
-	*buf = append(*buf, '\n')
 }
 
-func (l *Logger) log(level Level, format string, args ...interface{}) {
+// Error logs a message at error level
-	bufp := l.bufPool.Get().(*[]byte)
+func (l *Logger) Error(format string, args ...any) {
-	l.formatMessage(bufp, level, format, args...)
-
-	if len(*bufp) > maxMessageSize {
-		*bufp = (*bufp)[:maxMessageSize]
-	}
-	_, _ = l.buffer.Write(*bufp)
-
-	l.bufPool.Put(bufp)
-}
-
-func (l *Logger) Error(format string, args ...interface{}) {
 	if l.level.Load() >= uint32(LevelError) {
 		l.log(LevelError, format, args...)
 	}
 }
 
-func (l *Logger) Warn(format string, args ...interface{}) {
+// Warn logs a message at warning level
+func (l *Logger) Warn(format string, args ...any) {
 	if l.level.Load() >= uint32(LevelWarn) {
 		l.log(LevelWarn, format, args...)
 	}
 }
 
-func (l *Logger) Info(format string, args ...interface{}) {
+// Info logs a message at info level
+func (l *Logger) Info(format string, args ...any) {
 	if l.level.Load() >= uint32(LevelInfo) {
 		l.log(LevelInfo, format, args...)
 	}
 }
 
-func (l *Logger) Debug(format string, args ...interface{}) {
+// Debug logs a message at debug level
+func (l *Logger) Debug(format string, args ...any) {
 	if l.level.Load() >= uint32(LevelDebug) {
 		l.log(LevelDebug, format, args...)
 	}
 }
 
-func (l *Logger) Trace(format string, args ...interface{}) {
+// Trace logs a message at trace level
+func (l *Logger) Trace(format string, args ...any) {
 	if l.level.Load() >= uint32(LevelTrace) {
 		l.log(LevelTrace, format, args...)
 	}
 }
 
-// worker periodically flushes the buffer
+func (l *Logger) formatMessage(buf *[]byte, level Level, format string, args ...any) {
+	*buf = (*buf)[:0]
+	*buf = time.Now().AppendFormat(*buf, "2006-01-02T15:04:05-07:00")
+	*buf = append(*buf, ' ')
+	*buf = append(*buf, levelStrings[level]...)
+	*buf = append(*buf, ' ')
+
+	var msg string
+	if len(args) > 0 {
+		msg = fmt.Sprintf(format, args...)
+	} else {
+		msg = format
+	}
+	*buf = append(*buf, msg...)
+	*buf = append(*buf, '\n')
+
+	if len(*buf) > maxMessageSize {
+		*buf = (*buf)[:maxMessageSize]
+	}
+}
+
+// processMessage handles a single log message and adds it to the buffer
+func (l *Logger) processMessage(msg logMessage, buffer *[]byte) {
+	bufp := l.bufPool.Get().(*[]byte)
+	defer l.bufPool.Put(bufp)
+
+	l.formatMessage(bufp, msg.level, msg.format, msg.args...)
+
+	if len(*buffer)+len(*bufp) > maxBatchSize {
+		_, _ = l.output.Write(*buffer)
+		*buffer = (*buffer)[:0]
+	}
+	*buffer = append(*buffer, *bufp...)
+}
+
+// flushBuffer writes the accumulated buffer to output
+func (l *Logger) flushBuffer(buffer *[]byte) {
+	if len(*buffer) > 0 {
+		_, _ = l.output.Write(*buffer)
+		*buffer = (*buffer)[:0]
+	}
+}
+
+// processBatch processes as many messages as possible without blocking
+func (l *Logger) processBatch(buffer *[]byte) {
+	for len(*buffer) < maxBatchSize {
+		select {
+		case msg := <-l.msgChannel:
+			l.processMessage(msg, buffer)
+		default:
+			return
+		}
+	}
+}
+
+// handleShutdown manages the graceful shutdown sequence with timeout
+func (l *Logger) handleShutdown(buffer *[]byte) {
+	ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
+	defer cancel()
+
+	for {
+		select {
+		case msg := <-l.msgChannel:
+			l.processMessage(msg, buffer)
+		case <-ctx.Done():
+			l.flushBuffer(buffer)
+			return
+		}
+
+		if len(l.msgChannel) == 0 {
+			l.flushBuffer(buffer)
+			return
+		}
+	}
+}
+
+// worker is the main goroutine that processes log messages
 func (l *Logger) worker() {
 	defer l.wg.Done()
 
 	ticker := time.NewTicker(defaultFlushInterval)
 	defer ticker.Stop()
 
-	buf := make([]byte, 0, maxBatchSize)
+	buffer := make([]byte, 0, maxBatchSize)
 
 	for {
 		select {
 		case <-l.shutdown:
+			l.handleShutdown(&buffer)
 			return
 		case <-ticker.C:
-			// Read accumulated messages
+			l.flushBuffer(&buffer)
-			n, _ := l.buffer.Read(buf[:cap(buf)])
+		case msg := <-l.msgChannel:
-			if n == 0 {
+			l.processMessage(msg, &buffer)
-				continue
+			l.processBatch(&buffer)
-			}
-
-			// Write batch
-			_, _ = l.output.Write(buf[:n])
 		}
 	}
 }

client/firewall/uspfilter/log/log_test.go

@@ -0,0 +1,121 @@
+package log_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/log"
+)
+
+type discard struct{}
+
+func (d *discard) Write(p []byte) (n int, err error) {
+	return len(p), nil
+}
+
+func BenchmarkLogger(b *testing.B) {
+	simpleMessage := "Connection established"
+
+	conntrackMessage := "TCP connection %s:%d -> %s:%d state changed to %d"
+	srcIP := "192.168.1.1"
+	srcPort := uint16(12345)
+	dstIP := "10.0.0.1"
+	dstPort := uint16(443)
+	state := 4 // TCPStateEstablished
+
+	complexMessage := "Packet inspection result: protocol=%s, direction=%s, flags=0x%x, sequence=%d, acknowledged=%d, payload_size=%d, fragmented=%v, connection_id=%s"
+	protocol := "TCP"
+	direction := "outbound"
+	flags := uint16(0x18) // ACK + PSH
+	sequence := uint32(123456789)
+	acknowledged := uint32(987654321)
+	payloadSize := 1460
+	fragmented := false
+	connID := "f7a12b3e-c456-7890-d123-456789abcdef"
+
+	b.Run("SimpleMessage", func(b *testing.B) {
+		logger := createTestLogger()
+		defer cleanupLogger(logger)
+
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			logger.Trace(simpleMessage)
+		}
+	})
+
+	b.Run("ConntrackMessage", func(b *testing.B) {
+		logger := createTestLogger()
+		defer cleanupLogger(logger)
+
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			logger.Trace(conntrackMessage, srcIP, srcPort, dstIP, dstPort, state)
+		}
+	})
+
+	b.Run("ComplexMessage", func(b *testing.B) {
+		logger := createTestLogger()
+		defer cleanupLogger(logger)
+
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			logger.Trace(complexMessage, protocol, direction, flags, sequence, acknowledged, payloadSize, fragmented, connID)
+		}
+	})
+}
+
+// BenchmarkLoggerParallel tests the logger under concurrent load
+func BenchmarkLoggerParallel(b *testing.B) {
+	logger := createTestLogger()
+	defer cleanupLogger(logger)
+
+	conntrackMessage := "TCP connection %s:%d -> %s:%d state changed to %d"
+	srcIP := "192.168.1.1"
+	srcPort := uint16(12345)
+	dstIP := "10.0.0.1"
+	dstPort := uint16(443)
+	state := 4
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			logger.Trace(conntrackMessage, srcIP, srcPort, dstIP, dstPort, state)
+		}
+	})
+}
+
+// BenchmarkLoggerBurst tests how the logger handles bursts of messages
+func BenchmarkLoggerBurst(b *testing.B) {
+	logger := createTestLogger()
+	defer cleanupLogger(logger)
+
+	conntrackMessage := "TCP connection %s:%d -> %s:%d state changed to %d"
+	srcIP := "192.168.1.1"
+	srcPort := uint16(12345)
+	dstIP := "10.0.0.1"
+	dstPort := uint16(443)
+	state := 4
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j := 0; j < 100; j++ {
+			logger.Trace(conntrackMessage, srcIP, srcPort, dstIP, dstPort, state)
+		}
+	}
+}
+
+func createTestLogger() *log.Logger {
+	logrusLogger := logrus.New()
+	logrusLogger.SetOutput(&discard{})
+	logrusLogger.SetLevel(logrus.TraceLevel)
+	return log.NewFromLogrus(logrusLogger)
+}
+
+func cleanupLogger(logger *log.Logger) {
+	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+	_ = logger.Stop(ctx)
+}

client/firewall/uspfilter/log/ringbuffer.go

@@ -1,85 +0,0 @@
-package log
-
-import "sync"
-
-// ringBuffer is a simple ring buffer implementation
-type ringBuffer struct {
-	buf  []byte
-	size int
-	r, w int64 // Read and write positions
-	mu   sync.Mutex
-}
-
-func newRingBuffer(size int) *ringBuffer {
-	return &ringBuffer{
-		buf:  make([]byte, size),
-		size: size,
-	}
-}
-
-func (r *ringBuffer) Write(p []byte) (n int, err error) {
-	if len(p) == 0 {
-		return 0, nil
-	}
-
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	if len(p) > r.size {
-		p = p[:r.size]
-	}
-
-	n = len(p)
-
-	// Write data, handling wrap-around
-	pos := int(r.w % int64(r.size))
-	writeLen := min(len(p), r.size-pos)
-	copy(r.buf[pos:], p[:writeLen])
-
-	// If we have more data and need to wrap around
-	if writeLen < len(p) {
-		copy(r.buf, p[writeLen:])
-	}
-
-	// Update write position
-	r.w += int64(n)
-
-	return n, nil
-}
-
-func (r *ringBuffer) Read(p []byte) (n int, err error) {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	if r.w == r.r {
-		return 0, nil
-	}
-
-	// Calculate available data accounting for wraparound
-	available := int(r.w - r.r)
-	if available < 0 {
-		available += r.size
-	}
-	available = min(available, r.size)
-
-	// Limit read to buffer size
-	toRead := min(available, len(p))
-	if toRead == 0 {
-		return 0, nil
-	}
-
-	// Read data, handling wrap-around
-	pos := int(r.r % int64(r.size))
-	readLen := min(toRead, r.size-pos)
-	n = copy(p, r.buf[pos:pos+readLen])
-
-	// If we need more data and need to wrap around
-	if readLen < toRead {
-		n += copy(p[readLen:toRead], r.buf[:toRead-readLen])
-	}
-
-	// Update read position
-	r.r += int64(n)
-
-	return n, nil
-}

client/firewall/uspfilter/rule.go

@@ -1,7 +1,6 @@
 package uspfilter
 
 import (
-	"net"
 	"net/netip"
 
 	"github.com/google/gopacket"
@@ -12,25 +11,26 @@ import (
 // PeerRule to handle management of rules
 type PeerRule struct {
 	id         string
-	ip         net.IP
+	mgmtId     []byte
+	ip         netip.Addr
 	ipLayer    gopacket.LayerType
 	matchByIP  bool
 	protoLayer gopacket.LayerType
 	sPort      *firewall.Port
 	dPort      *firewall.Port
 	drop       bool
-	comment    string
 
 	udpHook func([]byte) bool
 }
 
-// GetRuleID returns the rule id
+// ID returns the rule id
-func (r *PeerRule) GetRuleID() string {
+func (r *PeerRule) ID() string {
 	return r.id
 }
 
 type RouteRule struct {
 	id          string
+	mgmtId      []byte
 	sources     []netip.Prefix
 	destination netip.Prefix
 	proto       firewall.Protocol
@@ -39,7 +39,7 @@ type RouteRule struct {
 	action      firewall.Action
 }
 
-// GetRuleID returns the rule id
+// ID returns the rule id
-func (r *RouteRule) GetRuleID() string {
+func (r *RouteRule) ID() string {
 	return r.id
 }

client/firewall/uspfilter/tracer.go

@@ -2,7 +2,7 @@ package uspfilter
 
 import (
 	"fmt"
-	"net"
+	"net/netip"
 	"time"
 
 	"github.com/google/gopacket"
@@ -53,8 +53,8 @@ type TraceResult struct {
 }
 
 type PacketTrace struct {
-	SourceIP        net.IP
+	SourceIP        netip.Addr
-	DestinationIP   net.IP
+	DestinationIP   netip.Addr
 	Protocol        string
 	SourcePort      uint16
 	DestinationPort uint16
@@ -72,8 +72,8 @@ type TCPState struct {
 }
 
 type PacketBuilder struct {
-	SrcIP       net.IP
+	SrcIP       netip.Addr
-	DstIP       net.IP
+	DstIP       netip.Addr
 	Protocol    fw.Protocol
 	SrcPort     uint16
 	DstPort     uint16
@@ -126,8 +126,8 @@ func (p *PacketBuilder) buildIPLayer() *layers.IPv4 {
 		Version:  4,
 		TTL:      64,
 		Protocol: layers.IPProtocol(getIPProtocolNumber(p.Protocol)),
-		SrcIP:    p.SrcIP,
+		SrcIP:    p.SrcIP.AsSlice(),
-		DstIP:    p.DstIP,
+		DstIP:    p.DstIP.AsSlice(),
 	}
 }
 
@@ -260,28 +260,30 @@ func (m *Manager) TracePacket(packetData []byte, direction fw.RuleDirection) *Pa
 	return m.traceInbound(packetData, trace, d, srcIP, dstIP)
 }
 
-func (m *Manager) traceInbound(packetData []byte, trace *PacketTrace, d *decoder, srcIP net.IP, dstIP net.IP) *PacketTrace {
+func (m *Manager) traceInbound(packetData []byte, trace *PacketTrace, d *decoder, srcIP netip.Addr, dstIP netip.Addr) *PacketTrace {
 	if m.stateful && m.handleConntrackState(trace, d, srcIP, dstIP) {
 		return trace
 	}
 
+	if m.localipmanager.IsLocalIP(dstIP) {
 		if m.handleLocalDelivery(trace, packetData, d, srcIP, dstIP) {
 			return trace
 		}
+	}
 
 	if !m.handleRouting(trace) {
 		return trace
 	}
 
-	if m.nativeRouter {
+	if m.nativeRouter.Load() {
 		return m.handleNativeRouter(trace)
 	}
 
 	return m.handleRouteACLs(trace, d, srcIP, dstIP)
 }
 
-func (m *Manager) handleConntrackState(trace *PacketTrace, d *decoder, srcIP, dstIP net.IP) bool {
+func (m *Manager) handleConntrackState(trace *PacketTrace, d *decoder, srcIP, dstIP netip.Addr) bool {
-	allowed := m.isValidTrackedConnection(d, srcIP, dstIP)
+	allowed := m.isValidTrackedConnection(d, srcIP, dstIP, 0)
 	msg := "No existing connection found"
 	if allowed {
 		msg = m.buildConntrackStateMessage(d)
@@ -309,32 +311,46 @@ func (m *Manager) buildConntrackStateMessage(d *decoder) string {
 	return msg
 }
 
-func (m *Manager) handleLocalDelivery(trace *PacketTrace, packetData []byte, d *decoder, srcIP, dstIP net.IP) bool {
+func (m *Manager) handleLocalDelivery(trace *PacketTrace, packetData []byte, d *decoder, srcIP, dstIP netip.Addr) bool {
-	if !m.localForwarding {
+	trace.AddResult(StageRouting, "Packet destined for local delivery", true)
-		trace.AddResult(StageRouting, "Local forwarding disabled", false)
+
-		trace.AddResult(StageCompleted, "Packet dropped - local forwarding disabled", false)
+	ruleId, blocked := m.peerACLsBlock(srcIP, packetData, m.incomingRules, d)
+
+	strRuleId := "<no id>"
+	if ruleId != nil {
+		strRuleId = string(ruleId)
+	}
+	msg := fmt.Sprintf("Allowed by peer ACL rules (%s)", strRuleId)
+	if blocked {
+		msg = fmt.Sprintf("Blocked by peer ACL rules (%s)", strRuleId)
+		trace.AddResult(StagePeerACL, msg, false)
+		trace.AddResult(StageCompleted, "Packet dropped - ACL denied", false)
 		return true
 	}
 
-	trace.AddResult(StageRouting, "Packet destined for local delivery", true)
+	trace.AddResult(StagePeerACL, msg, true)
-	blocked := m.peerACLsBlock(srcIP, packetData, m.incomingRules, d)
-
-	msg := "Allowed by peer ACL rules"
-	if blocked {
-		msg = "Blocked by peer ACL rules"
-	}
-	trace.AddResult(StagePeerACL, msg, !blocked)
 
+	// Handle netstack mode
 	if m.netstack {
-		m.addForwardingResult(trace, "proxy-local", "127.0.0.1", !blocked)
+		switch {
+		case !m.localForwarding:
+			trace.AddResult(StageCompleted, "Packet sent to virtual stack", true)
+		case m.forwarder.Load() != nil:
+			m.addForwardingResult(trace, "proxy-local", "127.0.0.1", true)
+			trace.AddResult(StageCompleted, msgProcessingCompleted, true)
+		default:
+			trace.AddResult(StageCompleted, "Packet dropped - forwarder not initialized", false)
+		}
+		return true
 	}
 
-	trace.AddResult(StageCompleted, msgProcessingCompleted, !blocked)
+	// In normal mode, packets are allowed through for local delivery
+	trace.AddResult(StageCompleted, msgProcessingCompleted, true)
 	return true
 }
 
 func (m *Manager) handleRouting(trace *PacketTrace) bool {
-	if !m.routingEnabled {
+	if !m.routingEnabled.Load() {
 		trace.AddResult(StageRouting, "Routing disabled", false)
 		trace.AddResult(StageCompleted, "Packet dropped - routing disabled", false)
 		return false
@@ -350,18 +366,23 @@ func (m *Manager) handleNativeRouter(trace *PacketTrace) *PacketTrace {
 	return trace
 }
 
-func (m *Manager) handleRouteACLs(trace *PacketTrace, d *decoder, srcIP, dstIP net.IP) *PacketTrace {
+func (m *Manager) handleRouteACLs(trace *PacketTrace, d *decoder, srcIP, dstIP netip.Addr) *PacketTrace {
-	proto := getProtocolFromPacket(d)
+	proto, _ := getProtocolFromPacket(d)
 	srcPort, dstPort := getPortsFromPacket(d)
-	allowed := m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort)
+	id, allowed := m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort)
 
-	msg := "Allowed by route ACLs"
+	strId := string(id)
+	if id == nil {
+		strId = "<no id>"
+	}
+
+	msg := fmt.Sprintf("Allowed by route ACLs (%s)", strId)
 	if !allowed {
-		msg = "Blocked by route ACLs"
+		msg = fmt.Sprintf("Blocked by route ACLs (%s)", strId)
 	}
 	trace.AddResult(StageRouteACL, msg, allowed)
 
-	if allowed && m.forwarder != nil {
+	if allowed && m.forwarder.Load() != nil {
 		m.addForwardingResult(trace, "proxy-remote", fmt.Sprintf("%s:%d", dstIP, dstPort), true)
 	}
 
@@ -380,7 +401,7 @@ func (m *Manager) addForwardingResult(trace *PacketTrace, action, remoteAddr str
 
 func (m *Manager) traceOutbound(packetData []byte, trace *PacketTrace) *PacketTrace {
 	// will create or update the connection state
-	dropped := m.processOutgoingHooks(packetData)
+	dropped := m.processOutgoingHooks(packetData, 0)
 	if dropped {
 		trace.AddResult(StageCompleted, "Packet dropped by outgoing hook", false)
 	} else {

client/firewall/uspfilter/tracer_test.go

@@ -0,0 +1,440 @@
+package uspfilter
+
+import (
+	"net"
+	"net/netip"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	fw "github.com/netbirdio/netbird/client/firewall/manager"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
+	"github.com/netbirdio/netbird/client/firewall/uspfilter/forwarder"
+	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+)
+
+func verifyTraceStages(t *testing.T, trace *PacketTrace, expectedStages []PacketStage) {
+	t.Logf("Trace results: %v", trace.Results)
+	actualStages := make([]PacketStage, 0, len(trace.Results))
+	for _, result := range trace.Results {
+		actualStages = append(actualStages, result.Stage)
+		t.Logf("Stage: %s, Message: %s, Allowed: %v", result.Stage, result.Message, result.Allowed)
+	}
+
+	require.ElementsMatch(t, expectedStages, actualStages, "Trace stages don't match expected stages")
+}
+
+func verifyFinalDisposition(t *testing.T, trace *PacketTrace, expectedAllowed bool) {
+	require.NotEmpty(t, trace.Results, "Trace should have results")
+	lastResult := trace.Results[len(trace.Results)-1]
+	require.Equal(t, StageCompleted, lastResult.Stage, "Last stage should be 'Completed'")
+	require.Equal(t, expectedAllowed, lastResult.Allowed, "Final disposition incorrect")
+}
+
+func TestTracePacket(t *testing.T) {
+	setupTracerTest := func(statefulMode bool) *Manager {
+		ifaceMock := &IFaceMock{
+			SetFilterFunc: func(device.PacketFilter) error { return nil },
+			AddressFunc: func() wgaddr.Address {
+				return wgaddr.Address{
+					IP: net.ParseIP("100.10.0.100"),
+					Network: &net.IPNet{
+						IP:   net.ParseIP("100.10.0.0"),
+						Mask: net.CIDRMask(16, 32),
+					},
+				}
+			},
+		}
+
+		m, err := Create(ifaceMock, false, flowLogger)
+		require.NoError(t, err)
+
+		if !statefulMode {
+			m.stateful = false
+		}
+
+		return m
+	}
+
+	createPacketBuilder := func(srcIP, dstIP string, protocol fw.Protocol, srcPort, dstPort uint16, direction fw.RuleDirection) *PacketBuilder {
+		builder := &PacketBuilder{
+			SrcIP:     netip.MustParseAddr(srcIP),
+			DstIP:     netip.MustParseAddr(dstIP),
+			Protocol:  protocol,
+			SrcPort:   srcPort,
+			DstPort:   dstPort,
+			Direction: direction,
+		}
+
+		if protocol == "tcp" {
+			builder.TCPState = &TCPState{SYN: true}
+		}
+
+		return builder
+	}
+
+	createICMPPacketBuilder := func(srcIP, dstIP string, icmpType, icmpCode uint8, direction fw.RuleDirection) *PacketBuilder {
+		return &PacketBuilder{
+			SrcIP:     netip.MustParseAddr(srcIP),
+			DstIP:     netip.MustParseAddr(dstIP),
+			Protocol:  "icmp",
+			ICMPType:  icmpType,
+			ICMPCode:  icmpCode,
+			Direction: direction,
+		}
+	}
+
+	testCases := []struct {
+		name           string
+		setup          func(*Manager)
+		packetBuilder  func() *PacketBuilder
+		expectedStages []PacketStage
+		expectedAllow  bool
+	}{
+		{
+			name: "LocalTraffic_ACLAllowed",
+			setup: func(m *Manager) {
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolTCP
+				port := &fw.Port{Values: []uint16{80}}
+				action := fw.ActionAccept
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "LocalTraffic_ACLDenied",
+			setup: func(m *Manager) {
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolTCP
+				port := &fw.Port{Values: []uint16{80}}
+				action := fw.ActionDrop
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: false,
+		},
+		{
+			name: "LocalTraffic_WithForwarder",
+			setup: func(m *Manager) {
+				m.netstack = true
+				m.localForwarding = true
+
+				m.forwarder.Store(&forwarder.Forwarder{})
+
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolTCP
+				port := &fw.Port{Values: []uint16{80}}
+				action := fw.ActionAccept
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageForwarding,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "LocalTraffic_WithoutForwarder",
+			setup: func(m *Manager) {
+				m.netstack = true
+				m.localForwarding = false
+
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolTCP
+				port := &fw.Port{Values: []uint16{80}}
+				action := fw.ActionAccept
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "RoutedTraffic_ACLAllowed",
+			setup: func(m *Manager) {
+				m.routingEnabled.Store(true)
+				m.nativeRouter.Store(false)
+
+				m.forwarder.Store(&forwarder.Forwarder{})
+
+				src := netip.PrefixFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 32)
+				dst := netip.PrefixFrom(netip.AddrFrom4([4]byte{172, 17, 0, 2}), 32)
+				_, err := m.AddRouteFiltering(nil, []netip.Prefix{src}, dst, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{80}}, fw.ActionAccept)
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "172.17.0.2", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StageRouteACL,
+				StageForwarding,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "RoutedTraffic_ACLDenied",
+			setup: func(m *Manager) {
+				m.routingEnabled.Store(true)
+				m.nativeRouter.Store(false)
+
+				src := netip.PrefixFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 32)
+				dst := netip.PrefixFrom(netip.AddrFrom4([4]byte{172, 17, 0, 2}), 32)
+				_, err := m.AddRouteFiltering(nil, []netip.Prefix{src}, dst, fw.ProtocolTCP, nil, &fw.Port{Values: []uint16{80}}, fw.ActionDrop)
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "172.17.0.2", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StageRouteACL,
+				StageCompleted,
+			},
+			expectedAllow: false,
+		},
+		{
+			name: "RoutedTraffic_NativeRouter",
+			setup: func(m *Manager) {
+				m.routingEnabled.Store(true)
+				m.nativeRouter.Store(true)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "172.17.0.2", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StageRouteACL,
+				StageForwarding,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "RoutedTraffic_RoutingDisabled",
+			setup: func(m *Manager) {
+				m.routingEnabled.Store(false)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "172.17.0.2", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StageCompleted,
+			},
+			expectedAllow: false,
+		},
+		{
+			name: "ConnectionTracking_Hit",
+			setup: func(m *Manager) {
+				srcIP := netip.MustParseAddr("100.10.0.100")
+				dstIP := netip.MustParseAddr("1.1.1.1")
+				srcPort := uint16(12345)
+				dstPort := uint16(80)
+
+				m.tcpTracker.TrackOutbound(srcIP, dstIP, srcPort, dstPort, conntrack.TCPSyn, 0)
+			},
+			packetBuilder: func() *PacketBuilder {
+				pb := createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 80, 12345, fw.RuleDirectionIN)
+				pb.TCPState = &TCPState{SYN: true, ACK: true}
+				return pb
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "OutboundTraffic",
+			setup: func(m *Manager) {
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("100.10.0.100", "1.1.1.1", "tcp", 12345, 80, fw.RuleDirectionOUT)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "ICMPEchoRequest",
+			setup: func(m *Manager) {
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolICMP
+				action := fw.ActionAccept
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, nil, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createICMPPacketBuilder("1.1.1.1", "100.10.0.100", 8, 0, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "ICMPDestinationUnreachable",
+			setup: func(m *Manager) {
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolICMP
+				action := fw.ActionDrop
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, nil, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createICMPPacketBuilder("1.1.1.1", "100.10.0.100", 3, 0, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "UDPTraffic_WithoutHook",
+			setup: func(m *Manager) {
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolUDP
+				port := &fw.Port{Values: []uint16{53}}
+				action := fw.ActionAccept
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "udp", 12345, 53, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: true,
+		},
+		{
+			name: "UDPTraffic_WithHook",
+			setup: func(m *Manager) {
+				hookFunc := func([]byte) bool {
+					return true
+				}
+				m.AddUDPPacketHook(true, netip.MustParseAddr("1.1.1.1"), 53, hookFunc)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "udp", 12345, 53, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageConntrack,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: false,
+		},
+		{
+			name: "StatefulDisabled_NoTracking",
+			setup: func(m *Manager) {
+				m.stateful = false
+
+				ip := net.ParseIP("1.1.1.1")
+				proto := fw.ProtocolTCP
+				port := &fw.Port{Values: []uint16{80}}
+				action := fw.ActionDrop
+				_, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
+				require.NoError(t, err)
+			},
+			packetBuilder: func() *PacketBuilder {
+				return createPacketBuilder("1.1.1.1", "100.10.0.100", "tcp", 12345, 80, fw.RuleDirectionIN)
+			},
+			expectedStages: []PacketStage{
+				StageReceived,
+				StageRouting,
+				StagePeerACL,
+				StageCompleted,
+			},
+			expectedAllow: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			m := setupTracerTest(true)
+
+			tc.setup(m)
+
+			require.True(t, m.localipmanager.IsLocalIP(netip.MustParseAddr("100.10.0.100")),
+				"100.10.0.100 should be recognized as a local IP")
+			require.False(t, m.localipmanager.IsLocalIP(netip.MustParseAddr("172.17.0.2")),
+				"172.17.0.2 should not be recognized as a local IP")
+
+			pb := tc.packetBuilder()
+
+			trace, err := m.TracePacketFromBuilder(pb)
+			require.NoError(t, err)
+
+			verifyTraceStages(t, trace, tc.expectedStages)
+			verifyFinalDisposition(t, trace, tc.expectedAllow)
+		})
+	}
+}

client/firewall/uspfilter/uspfilter.go

@@ -10,6 +10,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
@@ -22,6 +23,7 @@ import (
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/forwarder"
 	nblog "github.com/netbirdio/netbird/client/firewall/uspfilter/log"
 	"github.com/netbirdio/netbird/client/iface/netstack"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 )
 
@@ -42,6 +44,8 @@ const (
 	EnvEnableNetstackLocalForwarding = "NB_ENABLE_NETSTACK_LOCAL_FORWARDING"
 )
 
+var errNatNotSupported = errors.New("nat not supported with userspace firewall")
+
 // RuleSet is a set of rules grouped by a string key
 type RuleSet map[string]PeerRule
 
@@ -63,9 +67,9 @@ func (r RouteRules) Sort() {
 // Manager userspace firewall manager
 type Manager struct {
 	// outgoingRules is used for hooks only
-	outgoingRules map[string]RuleSet
+	outgoingRules map[netip.Addr]RuleSet
 	// incomingRules is used for filtering and hooks
-	incomingRules  map[string]RuleSet
+	incomingRules  map[netip.Addr]RuleSet
 	routeRules     RouteRules
 	wgNetwork      *net.IPNet
 	decoders       sync.Pool
@@ -77,9 +81,9 @@ type Manager struct {
 	// indicates whether server routes are disabled
 	disableServerRoutes bool
 	// indicates whether we forward packets not destined for ourselves
-	routingEnabled bool
+	routingEnabled atomic.Bool
 	// indicates whether we leave forwarding and filtering to the native firewall
-	nativeRouter bool
+	nativeRouter atomic.Bool
 	// indicates whether we track outbound connections
 	stateful bool
 	// indicates whether wireguards runs in netstack mode
@@ -92,8 +96,9 @@ type Manager struct {
 	udpTracker  *conntrack.UDPTracker
 	icmpTracker *conntrack.ICMPTracker
 	tcpTracker  *conntrack.TCPTracker
-	forwarder   *forwarder.Forwarder
+	forwarder   atomic.Pointer[forwarder.Forwarder]
 	logger      *nblog.Logger
+	flowLogger  nftypes.FlowLogger
 }
 
 // decoder for packages
@@ -110,16 +115,16 @@ type decoder struct {
 }
 
 // Create userspace firewall manager constructor
-func Create(iface common.IFaceMapper, disableServerRoutes bool) (*Manager, error) {
+func Create(iface common.IFaceMapper, disableServerRoutes bool, flowLogger nftypes.FlowLogger) (*Manager, error) {
-	return create(iface, nil, disableServerRoutes)
+	return create(iface, nil, disableServerRoutes, flowLogger)
 }
 
-func CreateWithNativeFirewall(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool) (*Manager, error) {
+func CreateWithNativeFirewall(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool, flowLogger nftypes.FlowLogger) (*Manager, error) {
 	if nativeFirewall == nil {
 		return nil, errors.New("native firewall is nil")
 	}
 
-	mgr, err := create(iface, nativeFirewall, disableServerRoutes)
+	mgr, err := create(iface, nativeFirewall, disableServerRoutes, flowLogger)
 	if err != nil {
 		return nil, err
 	}
@@ -146,7 +151,7 @@ func parseCreateEnv() (bool, bool) {
 	return disableConntrack, enableLocalForwarding
 }
 
-func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool) (*Manager, error) {
+func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableServerRoutes bool, flowLogger nftypes.FlowLogger) (*Manager, error) {
 	disableConntrack, enableLocalForwarding := parseCreateEnv()
 
 	m := &Manager{
@@ -164,17 +169,18 @@ func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableSe
 			},
 		},
 		nativeFirewall:      nativeFirewall,
-		outgoingRules:       make(map[string]RuleSet),
+		outgoingRules:       make(map[netip.Addr]RuleSet),
-		incomingRules:       make(map[string]RuleSet),
+		incomingRules:       make(map[netip.Addr]RuleSet),
 		wgIface:             iface,
 		localipmanager:      newLocalIPManager(),
 		disableServerRoutes: disableServerRoutes,
-		routingEnabled:      false,
 		stateful:            !disableConntrack,
 		logger:              nblog.NewFromLogrus(log.StandardLogger()),
+		flowLogger:          flowLogger,
 		netstack:            netstack.IsEnabled(),
 		localForwarding:     enableLocalForwarding,
 	}
+	m.routingEnabled.Store(false)
 
 	if err := m.localipmanager.UpdateLocalIPs(iface); err != nil {
 		return nil, fmt.Errorf("update local IPs: %w", err)
@@ -183,9 +189,9 @@ func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableSe
 	if disableConntrack {
 		log.Info("conntrack is disabled")
 	} else {
-		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger)
+		m.udpTracker = conntrack.NewUDPTracker(conntrack.DefaultUDPTimeout, m.logger, flowLogger)
-		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger)
+		m.icmpTracker = conntrack.NewICMPTracker(conntrack.DefaultICMPTimeout, m.logger, flowLogger)
-		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger)
+		m.tcpTracker = conntrack.NewTCPTracker(conntrack.DefaultTCPTimeout, m.logger, flowLogger)
 	}
 
 	// netstack needs the forwarder for local traffic
@@ -206,7 +212,7 @@ func create(iface common.IFaceMapper, nativeFirewall firewall.Manager, disableSe
 }
 
 func (m *Manager) blockInvalidRouted(iface common.IFaceMapper) error {
-	if m.forwarder == nil {
+	if m.forwarder.Load() == nil {
 		return nil
 	}
 	wgPrefix, err := netip.ParsePrefix(iface.Address().Network.String())
@@ -216,6 +222,7 @@ func (m *Manager) blockInvalidRouted(iface common.IFaceMapper) error {
 	log.Debugf("blocking invalid routed traffic for %s", wgPrefix)
 
 	if _, err := m.AddRouteFiltering(
+		nil,
 		[]netip.Prefix{netip.PrefixFrom(netip.IPv4Unspecified(), 0)},
 		wgPrefix,
 		firewall.ProtocolALL,
@@ -249,20 +256,20 @@ func (m *Manager) determineRouting() error {
 
 	switch {
 	case disableUspRouting:
-		m.routingEnabled = false
+		m.routingEnabled.Store(false)
-		m.nativeRouter = false
+		m.nativeRouter.Store(false)
 		log.Info("userspace routing is disabled")
 
 	case m.disableServerRoutes:
 		//  if server routes are disabled we will let packets pass to the native stack
-		m.routingEnabled = true
+		m.routingEnabled.Store(true)
-		m.nativeRouter = true
+		m.nativeRouter.Store(true)
 
 		log.Info("server routes are disabled")
 
 	case forceUserspaceRouter:
-		m.routingEnabled = true
+		m.routingEnabled.Store(true)
-		m.nativeRouter = false
+		m.nativeRouter.Store(false)
 
 		log.Info("userspace routing is forced")
 
@@ -270,19 +277,19 @@ func (m *Manager) determineRouting() error {
 		// if the OS supports routing natively, then we don't need to filter/route ourselves
 		// netstack mode won't support native routing as there is no interface
 
-		m.routingEnabled = true
+		m.routingEnabled.Store(true)
-		m.nativeRouter = true
+		m.nativeRouter.Store(true)
 
 		log.Info("native routing is enabled")
 
 	default:
-		m.routingEnabled = true
+		m.routingEnabled.Store(true)
-		m.nativeRouter = false
+		m.nativeRouter.Store(false)
 
 		log.Info("userspace routing enabled by default")
 	}
 
-	if m.routingEnabled && !m.nativeRouter {
+	if m.routingEnabled.Load() && !m.nativeRouter.Load() {
 		return m.initForwarder()
 	}
 
@@ -291,24 +298,24 @@ func (m *Manager) determineRouting() error {
 
 // initForwarder initializes the forwarder, it disables routing on errors
 func (m *Manager) initForwarder() error {
-	if m.forwarder != nil {
+	if m.forwarder.Load() != nil {
 		return nil
 	}
 
 	// Only supported in userspace mode as we need to inject packets back into wireguard directly
 	intf := m.wgIface.GetWGDevice()
 	if intf == nil {
-		m.routingEnabled = false
+		m.routingEnabled.Store(false)
 		return errors.New("forwarding not supported")
 	}
 
-	forwarder, err := forwarder.New(m.wgIface, m.logger, m.netstack)
+	forwarder, err := forwarder.New(m.wgIface, m.logger, m.flowLogger, m.netstack)
 	if err != nil {
-		m.routingEnabled = false
+		m.routingEnabled.Store(false)
 		return fmt.Errorf("create forwarder: %w", err)
 	}
 
-	m.forwarder = forwarder
+	m.forwarder.Store(forwarder)
 
 	log.Debug("forwarder initialized")
 
@@ -324,7 +331,7 @@ func (m *Manager) IsServerRouteSupported() bool {
 }
 
 func (m *Manager) AddNatRule(pair firewall.RouterPair) error {
-	if m.nativeRouter && m.nativeFirewall != nil {
+	if m.nativeRouter.Load() && m.nativeFirewall != nil {
 		return m.nativeFirewall.AddNatRule(pair)
 	}
 
@@ -335,7 +342,7 @@ func (m *Manager) AddNatRule(pair firewall.RouterPair) error {
 
 // RemoveNatRule removes a routing firewall rule
 func (m *Manager) RemoveNatRule(pair firewall.RouterPair) error {
-	if m.nativeRouter && m.nativeFirewall != nil {
+	if m.nativeRouter.Load() && m.nativeFirewall != nil {
 		return m.nativeFirewall.RemoveNatRule(pair)
 	}
 	return nil
@@ -346,25 +353,31 @@ func (m *Manager) RemoveNatRule(pair firewall.RouterPair) error {
 // If comment argument is empty firewall manager should set
 // rule ID as comment for the rule
 func (m *Manager) AddPeerFiltering(
+	id []byte,
 	ip net.IP,
 	proto firewall.Protocol,
 	sPort *firewall.Port,
 	dPort *firewall.Port,
 	action firewall.Action,
 	_ string,
-	comment string,
 ) ([]firewall.Rule, error) {
+	// TODO: fix in upper layers
+	i, ok := netip.AddrFromSlice(ip)
+	if !ok {
+		return nil, fmt.Errorf("invalid IP: %s", ip)
+	}
+
+	i = i.Unmap()
 	r := PeerRule{
 		id:        uuid.New().String(),
-		ip:        ip,
+		mgmtId:    id,
+		ip:        i,
 		ipLayer:   layers.LayerTypeIPv6,
 		matchByIP: true,
 		drop:      action == firewall.ActionDrop,
-		comment:   comment,
 	}
-	if ipNormalized := ip.To4(); ipNormalized != nil {
+	if i.Is4() {
 		r.ipLayer = layers.LayerTypeIPv4
-		r.ip = ipNormalized
 	}
 
 	if s := r.ip.String(); s == "0.0.0.0" || s == "::" {
@@ -389,15 +402,16 @@ func (m *Manager) AddPeerFiltering(
 	}
 
 	m.mutex.Lock()
-	if _, ok := m.incomingRules[r.ip.String()]; !ok {
+	if _, ok := m.incomingRules[r.ip]; !ok {
-		m.incomingRules[r.ip.String()] = make(RuleSet)
+		m.incomingRules[r.ip] = make(RuleSet)
 	}
-	m.incomingRules[r.ip.String()][r.id] = r
+	m.incomingRules[r.ip][r.id] = r
 	m.mutex.Unlock()
 	return []firewall.Rule{&r}, nil
 }
 
 func (m *Manager) AddRouteFiltering(
+	id []byte,
 	sources []netip.Prefix,
 	destination netip.Prefix,
 	proto firewall.Protocol,
@@ -405,16 +419,15 @@ func (m *Manager) AddRouteFiltering(
 	dPort *firewall.Port,
 	action firewall.Action,
 ) (firewall.Rule, error) {
-	if m.nativeRouter && m.nativeFirewall != nil {
+	if m.nativeRouter.Load() && m.nativeFirewall != nil {
-		return m.nativeFirewall.AddRouteFiltering(sources, destination, proto, sPort, dPort, action)
+		return m.nativeFirewall.AddRouteFiltering(id, sources, destination, proto, sPort, dPort, action)
 	}
 
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-
 	ruleID := uuid.New().String()
 	rule := RouteRule{
+		// TODO: consolidate these IDs
 		id:          ruleID,
+		mgmtId:      id,
 		sources:     sources,
 		destination: destination,
 		proto:       proto,
@@ -423,21 +436,23 @@ func (m *Manager) AddRouteFiltering(
 		action:      action,
 	}
 
+	m.mutex.Lock()
 	m.routeRules = append(m.routeRules, rule)
 	m.routeRules.Sort()
+	m.mutex.Unlock()
 
 	return &rule, nil
 }
 
 func (m *Manager) DeleteRouteRule(rule firewall.Rule) error {
-	if m.nativeRouter && m.nativeFirewall != nil {
+	if m.nativeRouter.Load() && m.nativeFirewall != nil {
 		return m.nativeFirewall.DeleteRouteRule(rule)
 	}
 
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	ruleID := rule.GetRuleID()
+	ruleID := rule.ID()
 	idx := slices.IndexFunc(m.routeRules, func(r RouteRule) bool {
 		return r.id == ruleID
 	})
@@ -459,10 +474,10 @@ func (m *Manager) DeletePeerRule(rule firewall.Rule) error {
 		return fmt.Errorf("delete rule: invalid rule type: %T", rule)
 	}
 
-	if _, ok := m.incomingRules[r.ip.String()][r.id]; !ok {
+	if _, ok := m.incomingRules[r.ip][r.id]; !ok {
 		return fmt.Errorf("delete rule: no rule with such id: %v", r.id)
 	}
-	delete(m.incomingRules[r.ip.String()], r.id)
+	delete(m.incomingRules[r.ip], r.id)
 
 	return nil
 }
@@ -478,14 +493,30 @@ func (m *Manager) SetLegacyManagement(isLegacy bool) error {
 // Flush doesn't need to be implemented for this manager
 func (m *Manager) Flush() error { return nil }
 
+// AddDNATRule adds a DNAT rule
+func (m *Manager) AddDNATRule(rule firewall.ForwardRule) (firewall.Rule, error) {
+	if m.nativeFirewall == nil {
+		return nil, errNatNotSupported
+	}
+	return m.nativeFirewall.AddDNATRule(rule)
+}
+
+// DeleteDNATRule deletes a DNAT rule
+func (m *Manager) DeleteDNATRule(rule firewall.Rule) error {
+	if m.nativeFirewall == nil {
+		return errNatNotSupported
+	}
+	return m.nativeFirewall.DeleteDNATRule(rule)
+}
+
 // DropOutgoing filter outgoing packets
-func (m *Manager) DropOutgoing(packetData []byte) bool {
+func (m *Manager) DropOutgoing(packetData []byte, size int) bool {
-	return m.processOutgoingHooks(packetData)
+	return m.processOutgoingHooks(packetData, size)
 }
 
 // DropIncoming filter incoming packets
-func (m *Manager) DropIncoming(packetData []byte) bool {
+func (m *Manager) DropIncoming(packetData []byte, size int) bool {
-	return m.dropFilter(packetData)
+	return m.dropFilter(packetData, size)
 }
 
 // UpdateLocalIPs updates the list of local IPs
@@ -493,10 +524,7 @@ func (m *Manager) UpdateLocalIPs() error {
 	return m.localipmanager.UpdateLocalIPs(m.wgIface)
 }
 
-func (m *Manager) processOutgoingHooks(packetData []byte) bool {
+func (m *Manager) processOutgoingHooks(packetData []byte, size int) bool {
-	m.mutex.RLock()
-	defer m.mutex.RUnlock()
-
 	d := m.decoders.Get().(*decoder)
 	defer m.decoders.Put(d)
 
@@ -509,52 +537,37 @@ func (m *Manager) processOutgoingHooks(packetData []byte) bool {
 	}
 
 	srcIP, dstIP := m.extractIPs(d)
-	if srcIP == nil {
+	if !srcIP.IsValid() {
+		m.logger.Error("Unknown network layer: %v", d.decoded[0])
 		return false
 	}
 
-	// Track all protocols if stateful mode is enabled
+	if d.decoded[1] == layers.LayerTypeUDP && m.udpHooksDrop(uint16(d.udp.DstPort), dstIP, packetData) {
-	if m.stateful {
+		return true
-		switch d.decoded[1] {
-		case layers.LayerTypeUDP:
-			m.trackUDPOutbound(d, srcIP, dstIP)
-		case layers.LayerTypeTCP:
-			m.trackTCPOutbound(d, srcIP, dstIP)
-		case layers.LayerTypeICMPv4:
-			m.trackICMPOutbound(d, srcIP, dstIP)
-		}
 	}
 
-	// Process UDP hooks even if stateful mode is disabled
+	if m.stateful {
-	if d.decoded[1] == layers.LayerTypeUDP {
+		m.trackOutbound(d, srcIP, dstIP, size)
-		return m.checkUDPHooks(d, dstIP, packetData)
 	}
 
 	return false
 }
 
-func (m *Manager) extractIPs(d *decoder) (srcIP, dstIP net.IP) {
+func (m *Manager) extractIPs(d *decoder) (srcIP, dstIP netip.Addr) {
 	switch d.decoded[0] {
 	case layers.LayerTypeIPv4:
-		return d.ip4.SrcIP, d.ip4.DstIP
+		src, _ := netip.AddrFromSlice(d.ip4.SrcIP)
+		dst, _ := netip.AddrFromSlice(d.ip4.DstIP)
+		return src, dst
 	case layers.LayerTypeIPv6:
-		return d.ip6.SrcIP, d.ip6.DstIP
+		src, _ := netip.AddrFromSlice(d.ip6.SrcIP)
+		dst, _ := netip.AddrFromSlice(d.ip6.DstIP)
+		return src, dst
 	default:
-		return nil, nil
+		return netip.Addr{}, netip.Addr{}
 	}
 }
 
-func (m *Manager) trackTCPOutbound(d *decoder, srcIP, dstIP net.IP) {
-	flags := getTCPFlags(&d.tcp)
-	m.tcpTracker.TrackOutbound(
-		srcIP,
-		dstIP,
-		uint16(d.tcp.SrcPort),
-		uint16(d.tcp.DstPort),
-		flags,
-	)
-}
-
 func getTCPFlags(tcp *layers.TCP) uint8 {
 	var flags uint8
 	if tcp.SYN {
@@ -578,45 +591,70 @@ func getTCPFlags(tcp *layers.TCP) uint8 {
 	return flags
 }
 
-func (m *Manager) trackUDPOutbound(d *decoder, srcIP, dstIP net.IP) {
+func (m *Manager) trackOutbound(d *decoder, srcIP, dstIP netip.Addr, size int) {
-	m.udpTracker.TrackOutbound(
+	transport := d.decoded[1]
-		srcIP,
+	switch transport {
-		dstIP,
+	case layers.LayerTypeUDP:
-		uint16(d.udp.SrcPort),
+		m.udpTracker.TrackOutbound(srcIP, dstIP, uint16(d.udp.SrcPort), uint16(d.udp.DstPort), size)
-		uint16(d.udp.DstPort),
+	case layers.LayerTypeTCP:
-	)
+		flags := getTCPFlags(&d.tcp)
+		m.tcpTracker.TrackOutbound(srcIP, dstIP, uint16(d.tcp.SrcPort), uint16(d.tcp.DstPort), flags, size)
+	case layers.LayerTypeICMPv4:
+		m.icmpTracker.TrackOutbound(srcIP, dstIP, d.icmp4.Id, d.icmp4.TypeCode, size)
+	}
 }
 
-func (m *Manager) checkUDPHooks(d *decoder, dstIP net.IP, packetData []byte) bool {
+func (m *Manager) trackInbound(d *decoder, srcIP, dstIP netip.Addr, ruleID []byte, size int) {
-	for _, ipKey := range []string{dstIP.String(), "0.0.0.0", "::"} {
+	transport := d.decoded[1]
-		if rules, exists := m.outgoingRules[ipKey]; exists {
+	switch transport {
+	case layers.LayerTypeUDP:
+		m.udpTracker.TrackInbound(srcIP, dstIP, uint16(d.udp.SrcPort), uint16(d.udp.DstPort), ruleID, size)
+	case layers.LayerTypeTCP:
+		flags := getTCPFlags(&d.tcp)
+		m.tcpTracker.TrackInbound(srcIP, dstIP, uint16(d.tcp.SrcPort), uint16(d.tcp.DstPort), flags, ruleID, size)
+	case layers.LayerTypeICMPv4:
+		m.icmpTracker.TrackInbound(srcIP, dstIP, d.icmp4.Id, d.icmp4.TypeCode, ruleID, size)
+	}
+}
+
+// udpHooksDrop checks if any UDP hooks should drop the packet
+func (m *Manager) udpHooksDrop(dport uint16, dstIP netip.Addr, packetData []byte) bool {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	// Check specific destination IP first
+	if rules, exists := m.outgoingRules[dstIP]; exists {
 		for _, rule := range rules {
-				if rule.udpHook != nil && portsMatch(rule.dPort, uint16(d.udp.DstPort)) {
+			if rule.udpHook != nil && portsMatch(rule.dPort, dport) {
 				return rule.udpHook(packetData)
 			}
 		}
 	}
-	}
-	return false
-}
 
-func (m *Manager) trackICMPOutbound(d *decoder, srcIP, dstIP net.IP) {
+	// Check IPv4 unspecified address
-	if d.icmp4.TypeCode.Type() == layers.ICMPv4TypeEchoRequest {
+	if rules, exists := m.outgoingRules[netip.IPv4Unspecified()]; exists {
-		m.icmpTracker.TrackOutbound(
+		for _, rule := range rules {
-			srcIP,
+			if rule.udpHook != nil && portsMatch(rule.dPort, dport) {
-			dstIP,
+				return rule.udpHook(packetData)
-			d.icmp4.Id,
-			d.icmp4.Seq,
-		)
 			}
+		}
+	}
+
+	// Check IPv6 unspecified address
+	if rules, exists := m.outgoingRules[netip.IPv6Unspecified()]; exists {
+		for _, rule := range rules {
+			if rule.udpHook != nil && portsMatch(rule.dPort, dport) {
+				return rule.udpHook(packetData)
+			}
+		}
+	}
+
+	return false
 }
 
 // dropFilter implements filtering logic for incoming packets.
 // If it returns true, the packet should be dropped.
-func (m *Manager) dropFilter(packetData []byte) bool {
+func (m *Manager) dropFilter(packetData []byte, size int) bool {
-	m.mutex.RLock()
-	defer m.mutex.RUnlock()
-
 	d := m.decoders.Get().(*decoder)
 	defer m.decoders.Put(d)
 
@@ -625,19 +663,19 @@ func (m *Manager) dropFilter(packetData []byte) bool {
 	}
 
 	srcIP, dstIP := m.extractIPs(d)
-	if srcIP == nil {
+	if !srcIP.IsValid() {
 		m.logger.Error("Unknown network layer: %v", d.decoded[0])
 		return true
 	}
 
 	// For all inbound traffic, first check if it matches a tracked connection.
 	// This must happen before any other filtering because the packets are statefully tracked.
-	if m.stateful && m.isValidTrackedConnection(d, srcIP, dstIP) {
+	if m.stateful && m.isValidTrackedConnection(d, srcIP, dstIP, size) {
 		return false
 	}
 
 	if m.localipmanager.IsLocalIP(dstIP) {
-		return m.handleLocalTraffic(d, srcIP, dstIP, packetData)
+		return m.handleLocalTraffic(d, srcIP, dstIP, packetData, size)
 	}
 
 	return m.handleRoutedTraffic(d, srcIP, dstIP, packetData)
@@ -645,10 +683,29 @@ func (m *Manager) dropFilter(packetData []byte) bool {
 
 // handleLocalTraffic handles local traffic.
 // If it returns true, the packet should be dropped.
-func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP net.IP, packetData []byte) bool {
+func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP netip.Addr, packetData []byte, size int) bool {
-	if m.peerACLsBlock(srcIP, packetData, m.incomingRules, d) {
+	ruleID, blocked := m.peerACLsBlock(srcIP, packetData, m.incomingRules, d)
-		m.logger.Trace("Dropping local packet (ACL denied): src=%s dst=%s",
+	if blocked {
-			srcIP, dstIP)
+		_, pnum := getProtocolFromPacket(d)
+		srcPort, dstPort := getPortsFromPacket(d)
+
+		m.logger.Trace("Dropping local packet (ACL denied): rule_id=%s proto=%v src=%s:%d dst=%s:%d",
+			ruleID, pnum, srcIP, srcPort, dstIP, dstPort)
+
+		m.flowLogger.StoreEvent(nftypes.EventFields{
+			FlowID:     uuid.New(),
+			Type:       nftypes.TypeDrop,
+			RuleID:     ruleID,
+			Direction:  nftypes.Ingress,
+			Protocol:   pnum,
+			SourceIP:   srcIP,
+			DestIP:     dstIP,
+			SourcePort: srcPort,
+			DestPort:   dstPort,
+			// TODO: icmp type/code
+			RxPackets: 1,
+			RxBytes:   uint64(size),
+		})
 		return true
 	}
 
@@ -657,6 +714,9 @@ func (m *Manager) handleLocalTraffic(d *decoder, srcIP, dstIP net.IP, packetData
 		return m.handleNetstackLocalTraffic(packetData)
 	}
 
+	// track inbound packets to get the correct direction and session id for flows
+	m.trackInbound(d, srcIP, dstIP, ruleID, size)
+
 	return false
 }
 
@@ -666,12 +726,12 @@ func (m *Manager) handleNetstackLocalTraffic(packetData []byte) bool {
 		return false
 	}
 
-	if m.forwarder == nil {
+	if m.forwarder.Load() == nil {
 		m.logger.Trace("Dropping local packet (forwarder not initialized)")
 		return true
 	}
 
-	if err := m.forwarder.InjectIncomingPacket(packetData); err != nil {
+	if err := m.forwarder.Load().InjectIncomingPacket(packetData); err != nil {
 		m.logger.Error("Failed to inject local packet: %v", err)
 	}
 
@@ -681,30 +741,43 @@ func (m *Manager) handleNetstackLocalTraffic(packetData []byte) bool {
 
 // handleRoutedTraffic handles routed traffic.
 // If it returns true, the packet should be dropped.
-func (m *Manager) handleRoutedTraffic(d *decoder, srcIP, dstIP net.IP, packetData []byte) bool {
+func (m *Manager) handleRoutedTraffic(d *decoder, srcIP, dstIP netip.Addr, packetData []byte) bool {
 	// Drop if routing is disabled
-	if !m.routingEnabled {
+	if !m.routingEnabled.Load() {
 		m.logger.Trace("Dropping routed packet (routing disabled): src=%s dst=%s",
 			srcIP, dstIP)
 		return true
 	}
 
 	// Pass to native stack if native router is enabled or forced
-	if m.nativeRouter {
+	if m.nativeRouter.Load() {
 		return false
 	}
 
-	proto := getProtocolFromPacket(d)
+	proto, pnum := getProtocolFromPacket(d)
 	srcPort, dstPort := getPortsFromPacket(d)
 
-	if !m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort) {
+	if ruleID, pass := m.routeACLsPass(srcIP, dstIP, proto, srcPort, dstPort); !pass {
-		m.logger.Trace("Dropping routed packet (ACL denied): src=%s:%d dst=%s:%d proto=%v",
+		m.logger.Trace("Dropping routed packet (ACL denied): rule_id=%s proto=%v src=%s:%d dst=%s:%d",
-			srcIP, srcPort, dstIP, dstPort, proto)
+			ruleID, pnum, srcIP, srcPort, dstIP, dstPort)
+
+		m.flowLogger.StoreEvent(nftypes.EventFields{
+			FlowID:     uuid.New(),
+			Type:       nftypes.TypeDrop,
+			RuleID:     ruleID,
+			Direction:  nftypes.Ingress,
+			Protocol:   pnum,
+			SourceIP:   srcIP,
+			DestIP:     dstIP,
+			SourcePort: srcPort,
+			DestPort:   dstPort,
+			// TODO: icmp type/code
+		})
 		return true
 	}
 
 	// Let forwarder handle the packet if it passed route ACLs
-	if err := m.forwarder.InjectIncomingPacket(packetData); err != nil {
+	if err := m.forwarder.Load().InjectIncomingPacket(packetData); err != nil {
 		m.logger.Error("Failed to inject incoming packet: %v", err)
 	}
 
@@ -712,16 +785,16 @@ func (m *Manager) handleRoutedTraffic(d *decoder, srcIP, dstIP net.IP, packetDat
 	return true
 }
 
-func getProtocolFromPacket(d *decoder) firewall.Protocol {
+func getProtocolFromPacket(d *decoder) (firewall.Protocol, nftypes.Protocol) {
 	switch d.decoded[1] {
 	case layers.LayerTypeTCP:
-		return firewall.ProtocolTCP
+		return firewall.ProtocolTCP, nftypes.TCP
 	case layers.LayerTypeUDP:
-		return firewall.ProtocolUDP
+		return firewall.ProtocolUDP, nftypes.UDP
 	case layers.LayerTypeICMPv4, layers.LayerTypeICMPv6:
-		return firewall.ProtocolICMP
+		return firewall.ProtocolICMP, nftypes.ICMP
 	default:
-		return firewall.ProtocolALL
+		return firewall.ProtocolALL, nftypes.ProtocolUnknown
 	}
 }
 
@@ -749,7 +822,7 @@ func (m *Manager) isValidPacket(d *decoder, packetData []byte) bool {
 	return true
 }
 
-func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool {
+func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP netip.Addr, size int) bool {
 	switch d.decoded[1] {
 	case layers.LayerTypeTCP:
 		return m.tcpTracker.IsValidInbound(
@@ -758,6 +831,7 @@ func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool
 			uint16(d.tcp.SrcPort),
 			uint16(d.tcp.DstPort),
 			getTCPFlags(&d.tcp),
+			size,
 		)
 
 	case layers.LayerTypeUDP:
@@ -766,6 +840,7 @@ func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool
 			dstIP,
 			uint16(d.udp.SrcPort),
 			uint16(d.udp.DstPort),
+			size,
 		)
 
 	case layers.LayerTypeICMPv4:
@@ -773,8 +848,8 @@ func (m *Manager) isValidTrackedConnection(d *decoder, srcIP, dstIP net.IP) bool
 			srcIP,
 			dstIP,
 			d.icmp4.Id,
-			d.icmp4.Seq,
 			d.icmp4.TypeCode.Type(),
+			size,
 		)
 
 		// TODO: ICMPv6
@@ -794,25 +869,27 @@ func (m *Manager) isSpecialICMP(d *decoder) bool {
 		icmpType == layers.ICMPv4TypeTimeExceeded
 }
 
-func (m *Manager) peerACLsBlock(srcIP net.IP, packetData []byte, rules map[string]RuleSet, d *decoder) bool {
+func (m *Manager) peerACLsBlock(srcIP netip.Addr, packetData []byte, rules map[netip.Addr]RuleSet, d *decoder) ([]byte, bool) {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
 	if m.isSpecialICMP(d) {
-		return false
+		return nil, false
 	}
 
-	if filter, ok := validateRule(srcIP, packetData, rules[srcIP.String()], d); ok {
+	if mgmtId, filter, ok := validateRule(srcIP, packetData, rules[srcIP], d); ok {
-		return filter
+		return mgmtId, filter
 	}
 
-	if filter, ok := validateRule(srcIP, packetData, rules["0.0.0.0"], d); ok {
+	if mgmtId, filter, ok := validateRule(srcIP, packetData, rules[netip.IPv4Unspecified()], d); ok {
-		return filter
+		return mgmtId, filter
 	}
 
-	if filter, ok := validateRule(srcIP, packetData, rules["::"], d); ok {
+	if mgmtId, filter, ok := validateRule(srcIP, packetData, rules[netip.IPv6Unspecified()], d); ok {
-		return filter
+		return mgmtId, filter
 	}
 
 	// Default policy: DROP ALL
-	return true
+	return nil, true
 }
 
 func portsMatch(rulePort *firewall.Port, packetPort uint16) bool {
@@ -832,15 +909,15 @@ func portsMatch(rulePort *firewall.Port, packetPort uint16) bool {
 	return false
 }
 
-func validateRule(ip net.IP, packetData []byte, rules map[string]PeerRule, d *decoder) (bool, bool) {
+func validateRule(ip netip.Addr, packetData []byte, rules map[string]PeerRule, d *decoder) ([]byte, bool, bool) {
 	payloadLayer := d.decoded[1]
 	for _, rule := range rules {
-		if rule.matchByIP && !ip.Equal(rule.ip) {
+		if rule.matchByIP && ip.Compare(rule.ip) != 0 {
 			continue
 		}
 
 		if rule.protoLayer == layerTypeAll {
-			return rule.drop, true
+			return rule.mgmtId, rule.drop, true
 		}
 
 		if payloadLayer != rule.protoLayer {
@@ -850,39 +927,36 @@ func validateRule(ip net.IP, packetData []byte, rules map[string]PeerRule, d *de
 		switch payloadLayer {
 		case layers.LayerTypeTCP:
 			if portsMatch(rule.sPort, uint16(d.tcp.SrcPort)) && portsMatch(rule.dPort, uint16(d.tcp.DstPort)) {
-				return rule.drop, true
+				return rule.mgmtId, rule.drop, true
 			}
 		case layers.LayerTypeUDP:
 			// if rule has UDP hook (and if we are here we match this rule)
 			// we ignore rule.drop and call this hook
 			if rule.udpHook != nil {
-				return rule.udpHook(packetData), true
+				return rule.mgmtId, rule.udpHook(packetData), true
 			}
 
 			if portsMatch(rule.sPort, uint16(d.udp.SrcPort)) && portsMatch(rule.dPort, uint16(d.udp.DstPort)) {
-				return rule.drop, true
+				return rule.mgmtId, rule.drop, true
 			}
 		case layers.LayerTypeICMPv4, layers.LayerTypeICMPv6:
-			return rule.drop, true
+			return rule.mgmtId, rule.drop, true
 		}
 	}
-	return false, false
+	return nil, false, false
 }
 
-// routeACLsPass returns treu if the packet is allowed by the route ACLs
+// routeACLsPass returns true if the packet is allowed by the route ACLs
-func (m *Manager) routeACLsPass(srcIP, dstIP net.IP, proto firewall.Protocol, srcPort, dstPort uint16) bool {
+func (m *Manager) routeACLsPass(srcIP, dstIP netip.Addr, proto firewall.Protocol, srcPort, dstPort uint16) ([]byte, bool) {
 	m.mutex.RLock()
 	defer m.mutex.RUnlock()
 
-	srcAddr := netip.AddrFrom4([4]byte(srcIP.To4()))
-	dstAddr := netip.AddrFrom4([4]byte(dstIP.To4()))
-
 	for _, rule := range m.routeRules {
-		if m.ruleMatches(rule, srcAddr, dstAddr, proto, srcPort, dstPort) {
+		if matches := m.ruleMatches(rule, srcIP, dstIP, proto, srcPort, dstPort); matches {
-			return rule.action == firewall.ActionAccept
+			return rule.mgmtId, rule.action == firewall.ActionAccept
 		}
 	}
-	return false
+	return nil, false
 }
 
 func (m *Manager) ruleMatches(rule RouteRule, srcAddr, dstAddr netip.Addr, proto firewall.Protocol, srcPort, dstPort uint16) bool {
@@ -922,36 +996,32 @@ func (m *Manager) SetNetwork(network *net.IPNet) {
 // AddUDPPacketHook calls hook when UDP packet from given direction matched
 //
 // Hook function returns flag which indicates should be the matched package dropped or not
-func (m *Manager) AddUDPPacketHook(
+func (m *Manager) AddUDPPacketHook(in bool, ip netip.Addr, dPort uint16, hook func(packet []byte) bool) string {
-	in bool, ip net.IP, dPort uint16, hook func([]byte) bool,
-) string {
 	r := PeerRule{
 		id:         uuid.New().String(),
 		ip:         ip,
 		protoLayer: layers.LayerTypeUDP,
 		dPort:      &firewall.Port{Values: []uint16{dPort}},
 		ipLayer:    layers.LayerTypeIPv6,
-		comment:    fmt.Sprintf("UDP Hook direction: %v, ip:%v, dport:%d", in, ip, dPort),
 		udpHook:    hook,
 	}
 
-	if ip.To4() != nil {
+	if ip.Is4() {
 		r.ipLayer = layers.LayerTypeIPv4
 	}
 
 	m.mutex.Lock()
 	if in {
-		if _, ok := m.incomingRules[r.ip.String()]; !ok {
+		if _, ok := m.incomingRules[r.ip]; !ok {
-			m.incomingRules[r.ip.String()] = make(map[string]PeerRule)
+			m.incomingRules[r.ip] = make(map[string]PeerRule)
 		}
-		m.incomingRules[r.ip.String()][r.id] = r
+		m.incomingRules[r.ip][r.id] = r
 	} else {
-		if _, ok := m.outgoingRules[r.ip.String()]; !ok {
+		if _, ok := m.outgoingRules[r.ip]; !ok {
-			m.outgoingRules[r.ip.String()] = make(map[string]PeerRule)
+			m.outgoingRules[r.ip] = make(map[string]PeerRule)
 		}
-		m.outgoingRules[r.ip.String()][r.id] = r
+		m.outgoingRules[r.ip][r.id] = r
 	}
-
 	m.mutex.Unlock()
 
 	return r.id
@@ -999,20 +1069,21 @@ func (m *Manager) DisableRouting() error {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 
-	if m.forwarder == nil {
+	fwder := m.forwarder.Load()
+	if fwder == nil {
 		return nil
 	}
 
-	m.routingEnabled = false
+	m.routingEnabled.Store(false)
-	m.nativeRouter = false
+	m.nativeRouter.Store(false)
 
 	// don't stop forwarder if in use by netstack
 	if m.netstack && m.localForwarding {
 		return nil
 	}
 
-	m.forwarder.Stop()
+	fwder.Stop()
-	m.forwarder = nil
+	m.forwarder.Store(nil)
 
 	log.Debug("forwarder stopped")
 

client/firewall/uspfilter/uspfilter_bench_test.go

@@ -93,8 +93,7 @@ func BenchmarkCoreFiltering(b *testing.B) {
 			stateful: false,
 			setupFunc: func(m *Manager) {
 				// Single rule allowing all traffic
-				_, err := m.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolALL, nil, nil,
+				_, err := m.AddPeerFiltering(nil, net.ParseIP("0.0.0.0"), fw.ProtocolALL, nil, nil, fw.ActionAccept, "")
-					fw.ActionAccept, "", "allow all")
 				require.NoError(b, err)
 			},
 			desc: "Baseline: Single 'allow all' rule without connection tracking",
@@ -114,10 +113,15 @@ func BenchmarkCoreFiltering(b *testing.B) {
 				// Add explicit rules matching return traffic pattern
 				for i := 0; i < 1000; i++ { // Simulate realistic ruleset size
 					ip := generateRandomIPs(1)[0]
-					_, err := m.AddPeerFiltering(ip, fw.ProtocolTCP,
+					_, err := m.AddPeerFiltering(
+						nil,
+						ip,
+						fw.ProtocolTCP,
 						&fw.Port{Values: []uint16{uint16(1024 + i)}},
 						&fw.Port{Values: []uint16{80}},
-						fw.ActionAccept, "", "explicit return")
+						fw.ActionAccept,
+						"",
+					)
 					require.NoError(b, err)
 				}
 			},
@@ -128,8 +132,15 @@ func BenchmarkCoreFiltering(b *testing.B) {
 			stateful: true,
 			setupFunc: func(m *Manager) {
 				// Add some basic rules but rely on state for established connections
-				_, err := m.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolTCP, nil, nil,
+				_, err := m.AddPeerFiltering(
-					fw.ActionDrop, "", "default drop")
+					nil,
+					net.ParseIP("0.0.0.0"),
+					fw.ProtocolTCP,
+					nil,
+					nil,
+					fw.ActionDrop,
+					"",
+				)
 				require.NoError(b, err)
 			},
 			desc: "Connection tracking with established connections",
@@ -158,7 +169,7 @@ func BenchmarkCoreFiltering(b *testing.B) {
 				// Create manager and basic setup
 				manager, _ := Create(&IFaceMock{
 					SetFilterFunc: func(device.PacketFilter) error { return nil },
-				}, false)
+				}, false, flowLogger)
 				defer b.Cleanup(func() {
 					require.NoError(b, manager.Close(nil))
 				})
@@ -182,13 +193,13 @@ func BenchmarkCoreFiltering(b *testing.B) {
 
 				// For stateful scenarios, establish the connection
 				if sc.stateful {
-					manager.processOutgoingHooks(outbound)
+					manager.processOutgoingHooks(outbound, 0)
 				}
 
 				// Measure inbound packet processing
 				b.ResetTimer()
 				for i := 0; i < b.N; i++ {
-					manager.dropFilter(inbound)
+					manager.dropFilter(inbound, 0)
 				}
 			})
 		}
@@ -203,7 +214,7 @@ func BenchmarkStateScaling(b *testing.B) {
 		b.Run(fmt.Sprintf("conns_%d", count), func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -219,7 +230,7 @@ func BenchmarkStateScaling(b *testing.B) {
 			for i := 0; i < count; i++ {
 				outbound := generatePacket(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, layers.IPProtocolTCP)
-				manager.processOutgoingHooks(outbound)
+				manager.processOutgoingHooks(outbound, 0)
 			}
 
 			// Test packet
@@ -227,11 +238,11 @@ func BenchmarkStateScaling(b *testing.B) {
 			testIn := generatePacket(b, dstIPs[0], srcIPs[0], 80, 1024, layers.IPProtocolTCP)
 
 			// First establish our test connection
-			manager.processOutgoingHooks(testOut)
+			manager.processOutgoingHooks(testOut, 0)
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(testIn)
+				manager.dropFilter(testIn, 0)
 			}
 		})
 	}
@@ -251,7 +262,7 @@ func BenchmarkEstablishmentOverhead(b *testing.B) {
 		b.Run(sc.name, func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -267,12 +278,12 @@ func BenchmarkEstablishmentOverhead(b *testing.B) {
 			inbound := generatePacket(b, dstIP, srcIP, 80, 1024, layers.IPProtocolTCP)
 
 			if sc.established {
-				manager.processOutgoingHooks(outbound)
+				manager.processOutgoingHooks(outbound, 0)
 			}
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(inbound)
+				manager.dropFilter(inbound, 0)
 			}
 		})
 	}
@@ -450,7 +461,7 @@ func BenchmarkRoutedNetworkReturn(b *testing.B) {
 		b.Run(sc.name, func(b *testing.B) {
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -466,25 +477,25 @@ func BenchmarkRoutedNetworkReturn(b *testing.B) {
 			// For stateful cases and established connections
 			if !strings.Contains(sc.name, "allow_non_wg") ||
 				(strings.Contains(sc.state, "established") || sc.state == "post_handshake") {
-				manager.processOutgoingHooks(outbound)
+				manager.processOutgoingHooks(outbound, 0)
 
 				// For TCP post-handshake, simulate full handshake
 				if sc.state == "post_handshake" {
 					// SYN
 					syn := generateTCPPacketWithFlags(b, srcIP, dstIP, 1024, 80, uint16(conntrack.TCPSyn))
-					manager.processOutgoingHooks(syn)
+					manager.processOutgoingHooks(syn, 0)
 					// SYN-ACK
 					synack := generateTCPPacketWithFlags(b, dstIP, srcIP, 80, 1024, uint16(conntrack.TCPSyn|conntrack.TCPAck))
-					manager.dropFilter(synack)
+					manager.dropFilter(synack, 0)
 					// ACK
 					ack := generateTCPPacketWithFlags(b, srcIP, dstIP, 1024, 80, uint16(conntrack.TCPAck))
-					manager.processOutgoingHooks(ack)
+					manager.processOutgoingHooks(ack, 0)
 				}
 			}
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				manager.dropFilter(inbound)
+				manager.dropFilter(inbound, 0)
 			}
 		})
 	}
@@ -577,7 +588,7 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -590,10 +601,7 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 			// Setup initial state based on scenario
 			if sc.rules {
 				// Single rule to allow all return traffic from port 80
-				_, err := manager.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolTCP,
+				_, err := manager.AddPeerFiltering(nil, net.ParseIP("0.0.0.0"), fw.ProtocolTCP, &fw.Port{Values: []uint16{80}}, nil, fw.ActionAccept, "")
-					&fw.Port{Values: []uint16{80}},
-					nil,
-					fw.ActionAccept, "", "return traffic")
 				require.NoError(b, err)
 			}
 
@@ -616,17 +624,17 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 				// Initial SYN
 				syn := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, uint16(conntrack.TCPSyn))
-				manager.processOutgoingHooks(syn)
+				manager.processOutgoingHooks(syn, 0)
 
 				// SYN-ACK
 				synack := generateTCPPacketWithFlags(b, dstIPs[i], srcIPs[i],
 					80, uint16(1024+i), uint16(conntrack.TCPSyn|conntrack.TCPAck))
-				manager.dropFilter(synack)
+				manager.dropFilter(synack, 0)
 
 				// ACK
 				ack := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, uint16(conntrack.TCPAck))
-				manager.processOutgoingHooks(ack)
+				manager.processOutgoingHooks(ack, 0)
 			}
 
 			// Prepare test packets simulating bidirectional traffic
@@ -647,9 +655,9 @@ func BenchmarkLongLivedConnections(b *testing.B) {
 
 				// Simulate bidirectional traffic
 				// First outbound data
-				manager.processOutgoingHooks(outPackets[connIdx])
+				manager.processOutgoingHooks(outPackets[connIdx], 0)
 				// Then inbound response - this is what we're actually measuring
-				manager.dropFilter(inPackets[connIdx])
+				manager.dropFilter(inPackets[connIdx], 0)
 			}
 		})
 	}
@@ -668,7 +676,7 @@ func BenchmarkShortLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -681,10 +689,7 @@ func BenchmarkShortLivedConnections(b *testing.B) {
 			// Setup initial state based on scenario
 			if sc.rules {
 				// Single rule to allow all return traffic from port 80
-				_, err := manager.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolTCP,
+				_, err := manager.AddPeerFiltering(nil, net.ParseIP("0.0.0.0"), fw.ProtocolTCP, &fw.Port{Values: []uint16{80}}, nil, fw.ActionAccept, "")
-					&fw.Port{Values: []uint16{80}},
-					nil,
-					fw.ActionAccept, "", "return traffic")
 				require.NoError(b, err)
 			}
 
@@ -756,19 +761,19 @@ func BenchmarkShortLivedConnections(b *testing.B) {
 				p := patterns[connIdx]
 
 				// Connection establishment
-				manager.processOutgoingHooks(p.syn)
+				manager.processOutgoingHooks(p.syn, 0)
-				manager.dropFilter(p.synAck)
+				manager.dropFilter(p.synAck, 0)
-				manager.processOutgoingHooks(p.ack)
+				manager.processOutgoingHooks(p.ack, 0)
 
 				// Data transfer
-				manager.processOutgoingHooks(p.request)
+				manager.processOutgoingHooks(p.request, 0)
-				manager.dropFilter(p.response)
+				manager.dropFilter(p.response, 0)
 
 				// Connection teardown
-				manager.processOutgoingHooks(p.finClient)
+				manager.processOutgoingHooks(p.finClient, 0)
-				manager.dropFilter(p.ackServer)
+				manager.dropFilter(p.ackServer, 0)
-				manager.dropFilter(p.finServer)
+				manager.dropFilter(p.finServer, 0)
-				manager.processOutgoingHooks(p.ackClient)
+				manager.processOutgoingHooks(p.ackClient, 0)
 			}
 		})
 	}
@@ -787,7 +792,7 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -799,10 +804,7 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 
 			// Setup initial state based on scenario
 			if sc.rules {
-				_, err := manager.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolTCP,
+				_, err := manager.AddPeerFiltering(nil, net.ParseIP("0.0.0.0"), fw.ProtocolTCP, &fw.Port{Values: []uint16{80}}, nil, fw.ActionAccept, "")
-					&fw.Port{Values: []uint16{80}},
-					nil,
-					fw.ActionAccept, "", "return traffic")
 				require.NoError(b, err)
 			}
 
@@ -824,15 +826,15 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 			for i := 0; i < sc.connCount; i++ {
 				syn := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, uint16(conntrack.TCPSyn))
-				manager.processOutgoingHooks(syn)
+				manager.processOutgoingHooks(syn, 0)
 
 				synack := generateTCPPacketWithFlags(b, dstIPs[i], srcIPs[i],
 					80, uint16(1024+i), uint16(conntrack.TCPSyn|conntrack.TCPAck))
-				manager.dropFilter(synack)
+				manager.dropFilter(synack, 0)
 
 				ack := generateTCPPacketWithFlags(b, srcIPs[i], dstIPs[i],
 					uint16(1024+i), 80, uint16(conntrack.TCPAck))
-				manager.processOutgoingHooks(ack)
+				manager.processOutgoingHooks(ack, 0)
 			}
 
 			// Pre-generate test packets
@@ -854,8 +856,8 @@ func BenchmarkParallelLongLivedConnections(b *testing.B) {
 					counter++
 
 					// Simulate bidirectional traffic
-					manager.processOutgoingHooks(outPackets[connIdx])
+					manager.processOutgoingHooks(outPackets[connIdx], 0)
-					manager.dropFilter(inPackets[connIdx])
+					manager.dropFilter(inPackets[connIdx], 0)
 				}
 			})
 		})
@@ -875,7 +877,7 @@ func BenchmarkParallelShortLivedConnections(b *testing.B) {
 
 			manager, _ := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			defer b.Cleanup(func() {
 				require.NoError(b, manager.Close(nil))
 			})
@@ -886,10 +888,7 @@ func BenchmarkParallelShortLivedConnections(b *testing.B) {
 			})
 
 			if sc.rules {
-				_, err := manager.AddPeerFiltering(net.ParseIP("0.0.0.0"), fw.ProtocolTCP,
+				_, err := manager.AddPeerFiltering(nil, net.ParseIP("0.0.0.0"), fw.ProtocolTCP, &fw.Port{Values: []uint16{80}}, nil, fw.ActionAccept, "")
-					&fw.Port{Values: []uint16{80}},
-					nil,
-					fw.ActionAccept, "", "return traffic")
 				require.NoError(b, err)
 			}
 
@@ -951,17 +950,17 @@ func BenchmarkParallelShortLivedConnections(b *testing.B) {
 					p := patterns[connIdx]
 
 					// Full connection lifecycle
-					manager.processOutgoingHooks(p.syn)
+					manager.processOutgoingHooks(p.syn, 0)
-					manager.dropFilter(p.synAck)
+					manager.dropFilter(p.synAck, 0)
-					manager.processOutgoingHooks(p.ack)
+					manager.processOutgoingHooks(p.ack, 0)
 
-					manager.processOutgoingHooks(p.request)
+					manager.processOutgoingHooks(p.request, 0)
-					manager.dropFilter(p.response)
+					manager.dropFilter(p.response, 0)
 
-					manager.processOutgoingHooks(p.finClient)
+					manager.processOutgoingHooks(p.finClient, 0)
-					manager.dropFilter(p.ackServer)
+					manager.dropFilter(p.ackServer, 0)
-					manager.dropFilter(p.finServer)
+					manager.dropFilter(p.finServer, 0)
-					manager.processOutgoingHooks(p.ackClient)
+					manager.processOutgoingHooks(p.ackClient, 0)
 				}
 			})
 		})
@@ -1033,14 +1032,7 @@ func BenchmarkRouteACLs(b *testing.B) {
 	}
 
 	for _, r := range rules {
-		_, err := manager.AddRouteFiltering(
+		_, err := manager.AddRouteFiltering(nil, r.sources, r.dest, r.proto, nil, r.port, fw.ActionAccept)
-			r.sources,
-			r.dest,
-			r.proto,
-			nil,
-			r.port,
-			fw.ActionAccept,
-		)
 		if err != nil {
 			b.Fatal(err)
 		}
@@ -1062,8 +1054,8 @@ func BenchmarkRouteACLs(b *testing.B) {
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		for _, tc := range cases {
-			srcIP := net.ParseIP(tc.srcIP)
+			srcIP := netip.MustParseAddr(tc.srcIP)
-			dstIP := net.ParseIP(tc.dstIP)
+			dstIP := netip.MustParseAddr(tc.dstIP)
 			manager.routeACLsPass(srcIP, dstIP, tc.proto, 0, tc.dstPort)
 		}
 	}

client/firewall/uspfilter/uspfilter_filter_test.go

@@ -12,9 +12,9 @@ import (
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
 	fw "github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/iface/mocks"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 func TestPeerACLFiltering(t *testing.T) {
@@ -26,15 +26,15 @@ func TestPeerACLFiltering(t *testing.T) {
 
 	ifaceMock := &IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP:      localIP,
 				Network: wgNet,
 			}
 		},
 	}
 
-	manager, err := Create(ifaceMock, false)
+	manager, err := Create(ifaceMock, false, flowLogger)
 	require.NoError(t, err)
 	require.NotNil(t, manager)
 
@@ -192,20 +192,20 @@ func TestPeerACLFiltering(t *testing.T) {
 
 	t.Run("Implicit DROP (no rules)", func(t *testing.T) {
 		packet := createTestPacket(t, "100.10.0.1", "100.10.0.100", fw.ProtocolTCP, 12345, 443)
-		isDropped := manager.DropIncoming(packet)
+		isDropped := manager.DropIncoming(packet, 0)
 		require.True(t, isDropped, "Packet should be dropped when no rules exist")
 	})
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			rules, err := manager.AddPeerFiltering(
+				nil,
 				net.ParseIP(tc.ruleIP),
 				tc.ruleProto,
 				tc.ruleSrcPort,
 				tc.ruleDstPort,
 				tc.ruleAction,
 				"",
-				tc.name,
 			)
 			require.NoError(t, err)
 			require.NotEmpty(t, rules)
@@ -217,7 +217,7 @@ func TestPeerACLFiltering(t *testing.T) {
 			})
 
 			packet := createTestPacket(t, tc.srcIP, tc.dstIP, tc.proto, tc.srcPort, tc.dstPort)
-			isDropped := manager.DropIncoming(packet)
+			isDropped := manager.DropIncoming(packet, 0)
 			require.Equal(t, tc.shouldBeBlocked, isDropped)
 		})
 	}
@@ -288,8 +288,8 @@ func setupRoutedManager(tb testing.TB, network string) *Manager {
 
 	ifaceMock := &IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP:      localIP,
 				Network: wgNet,
 			}
@@ -302,12 +302,12 @@ func setupRoutedManager(tb testing.TB, network string) *Manager {
 		},
 	}
 
-	manager, err := Create(ifaceMock, false)
+	manager, err := Create(ifaceMock, false, flowLogger)
 	require.NoError(tb, manager.EnableRouting())
 	require.NoError(tb, err)
 	require.NotNil(tb, manager)
-	require.True(tb, manager.routingEnabled)
+	require.True(tb, manager.routingEnabled.Load())
-	require.False(tb, manager.nativeRouter)
+	require.False(tb, manager.nativeRouter.Load())
 
 	tb.Cleanup(func() {
 		require.NoError(tb, manager.Close(nil))
@@ -803,6 +803,7 @@ func TestRouteACLFiltering(t *testing.T) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			rule, err := manager.AddRouteFiltering(
+				nil,
 				tc.rule.sources,
 				tc.rule.dest,
 				tc.rule.proto,
@@ -817,12 +818,12 @@ func TestRouteACLFiltering(t *testing.T) {
 				require.NoError(t, manager.DeleteRouteRule(rule))
 			})
 
-			srcIP := net.ParseIP(tc.srcIP)
+			srcIP := netip.MustParseAddr(tc.srcIP)
-			dstIP := net.ParseIP(tc.dstIP)
+			dstIP := netip.MustParseAddr(tc.dstIP)
 
 			// testing routeACLsPass only and not DropIncoming, as routed packets are dropped after being passed
 			// to the forwarder
-			isAllowed := manager.routeACLsPass(srcIP, dstIP, tc.proto, tc.srcPort, tc.dstPort)
+			_, isAllowed := manager.routeACLsPass(srcIP, dstIP, tc.proto, tc.srcPort, tc.dstPort)
 			require.Equal(t, tc.shouldPass, isAllowed)
 		})
 	}
@@ -985,6 +986,7 @@ func TestRouteACLOrder(t *testing.T) {
 			var rules []fw.Rule
 			for _, r := range tc.rules {
 				rule, err := manager.AddRouteFiltering(
+					nil,
 					r.sources,
 					r.dest,
 					r.proto,
@@ -1004,10 +1006,10 @@ func TestRouteACLOrder(t *testing.T) {
 			})
 
 			for i, p := range tc.packets {
-				srcIP := net.ParseIP(p.srcIP)
+				srcIP := netip.MustParseAddr(p.srcIP)
-				dstIP := net.ParseIP(p.dstIP)
+				dstIP := netip.MustParseAddr(p.dstIP)
 
-				isAllowed := manager.routeACLsPass(srcIP, dstIP, p.proto, p.srcPort, p.dstPort)
+				_, isAllowed := manager.routeACLsPass(srcIP, dstIP, p.proto, p.srcPort, p.dstPort)
 				require.Equal(t, p.shouldPass, isAllowed, "packet %d failed", i)
 			}
 		})

client/firewall/uspfilter/uspfilter_test.go

@@ -1,8 +1,10 @@
 package uspfilter
 
 import (
+	"context"
 	"fmt"
 	"net"
+	"net/netip"
 	"sync"
 	"testing"
 	"time"
@@ -16,15 +18,17 @@ import (
 	fw "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/conntrack"
 	"github.com/netbirdio/netbird/client/firewall/uspfilter/log"
-	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	"github.com/netbirdio/netbird/client/internal/netflow"
 )
 
 var logger = log.NewFromLogrus(logrus.StandardLogger())
+var flowLogger = netflow.NewManager(context.Background(), nil, []byte{}, nil).GetLogger()
 
 type IFaceMock struct {
 	SetFilterFunc   func(device.PacketFilter) error
-	AddressFunc     func() iface.WGAddress
+	AddressFunc     func() wgaddr.Address
 	GetWGDeviceFunc func() *wgdevice.Device
 	GetDeviceFunc   func() *device.FilteredDevice
 }
@@ -50,9 +54,9 @@ func (i *IFaceMock) SetFilter(iface device.PacketFilter) error {
 	return i.SetFilterFunc(iface)
 }
 
-func (i *IFaceMock) Address() iface.WGAddress {
+func (i *IFaceMock) Address() wgaddr.Address {
 	if i.AddressFunc == nil {
-		return iface.WGAddress{}
+		return wgaddr.Address{}
 	}
 	return i.AddressFunc()
 }
@@ -62,7 +66,7 @@ func TestManagerCreate(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock, false)
+	m, err := Create(ifaceMock, false, flowLogger)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -82,7 +86,7 @@ func TestManagerAddPeerFiltering(t *testing.T) {
 		},
 	}
 
-	m, err := Create(ifaceMock, false)
+	m, err := Create(ifaceMock, false, flowLogger)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -92,9 +96,8 @@ func TestManagerAddPeerFiltering(t *testing.T) {
 	proto := fw.ProtocolTCP
 	port := &fw.Port{Values: []uint16{80}}
 	action := fw.ActionDrop
-	comment := "Test rule"
 
-	rule, err := m.AddPeerFiltering(ip, proto, nil, port, action, "", comment)
+	rule, err := m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
 	if err != nil {
 		t.Errorf("failed to add filtering: %v", err)
 		return
@@ -116,26 +119,25 @@ func TestManagerDeleteRule(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock, false)
+	m, err := Create(ifaceMock, false, flowLogger)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
 	}
 
-	ip := net.ParseIP("192.168.1.1")
+	ip := netip.MustParseAddr("192.168.1.1")
 	proto := fw.ProtocolTCP
 	port := &fw.Port{Values: []uint16{80}}
 	action := fw.ActionDrop
-	comment := "Test rule 2"
 
-	rule2, err := m.AddPeerFiltering(ip, proto, nil, port, action, "", comment)
+	rule2, err := m.AddPeerFiltering(nil, ip.AsSlice(), proto, nil, port, action, "")
 	if err != nil {
 		t.Errorf("failed to add filtering: %v", err)
 		return
 	}
 
 	for _, r := range rule2 {
-		if _, ok := m.incomingRules[ip.String()][r.GetRuleID()]; !ok {
+		if _, ok := m.incomingRules[ip][r.ID()]; !ok {
 			t.Errorf("rule2 is not in the incomingRules")
 		}
 	}
@@ -149,7 +151,7 @@ func TestManagerDeleteRule(t *testing.T) {
 	}
 
 	for _, r := range rule2 {
-		if _, ok := m.incomingRules[ip.String()][r.GetRuleID()]; ok {
+		if _, ok := m.incomingRules[ip][r.ID()]; ok {
 			t.Errorf("rule2 is not in the incomingRules")
 		}
 	}
@@ -160,7 +162,7 @@ func TestAddUDPPacketHook(t *testing.T) {
 		name       string
 		in         bool
 		expDir     fw.RuleDirection
-		ip         net.IP
+		ip         netip.Addr
 		dPort      uint16
 		hook       func([]byte) bool
 		expectedID string
@@ -169,7 +171,7 @@ func TestAddUDPPacketHook(t *testing.T) {
 			name:   "Test Outgoing UDP Packet Hook",
 			in:     false,
 			expDir: fw.RuleDirectionOUT,
-			ip:     net.IPv4(10, 168, 0, 1),
+			ip:     netip.MustParseAddr("10.168.0.1"),
 			dPort:  8000,
 			hook:   func([]byte) bool { return true },
 		},
@@ -177,7 +179,7 @@ func TestAddUDPPacketHook(t *testing.T) {
 			name:   "Test Incoming UDP Packet Hook",
 			in:     true,
 			expDir: fw.RuleDirectionIN,
-			ip:     net.IPv6loopback,
+			ip:     netip.MustParseAddr("::1"),
 			dPort:  9000,
 			hook:   func([]byte) bool { return false },
 		},
@@ -187,18 +189,18 @@ func TestAddUDPPacketHook(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			manager, err := Create(&IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
-			}, false)
+			}, false, flowLogger)
 			require.NoError(t, err)
 
 			manager.AddUDPPacketHook(tt.in, tt.ip, tt.dPort, tt.hook)
 
 			var addedRule PeerRule
 			if tt.in {
-				if len(manager.incomingRules[tt.ip.String()]) != 1 {
+				if len(manager.incomingRules[tt.ip]) != 1 {
 					t.Errorf("expected 1 incoming rule, got %d", len(manager.incomingRules))
 					return
 				}
-				for _, rule := range manager.incomingRules[tt.ip.String()] {
+				for _, rule := range manager.incomingRules[tt.ip] {
 					addedRule = rule
 				}
 			} else {
@@ -206,12 +208,12 @@ func TestAddUDPPacketHook(t *testing.T) {
 					t.Errorf("expected 1 outgoing rule, got %d", len(manager.outgoingRules))
 					return
 				}
-				for _, rule := range manager.outgoingRules[tt.ip.String()] {
+				for _, rule := range manager.outgoingRules[tt.ip] {
 					addedRule = rule
 				}
 			}
 
-			if !tt.ip.Equal(addedRule.ip) {
+			if tt.ip.Compare(addedRule.ip) != 0 {
 				t.Errorf("expected ip %s, got %s", tt.ip, addedRule.ip)
 				return
 			}
@@ -236,7 +238,7 @@ func TestManagerReset(t *testing.T) {
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
 	}
 
-	m, err := Create(ifaceMock, false)
+	m, err := Create(ifaceMock, false, flowLogger)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -246,9 +248,8 @@ func TestManagerReset(t *testing.T) {
 	proto := fw.ProtocolTCP
 	port := &fw.Port{Values: []uint16{80}}
 	action := fw.ActionDrop
-	comment := "Test rule"
 
-	_, err = m.AddPeerFiltering(ip, proto, nil, port, action, "", comment)
+	_, err = m.AddPeerFiltering(nil, ip, proto, nil, port, action, "")
 	if err != nil {
 		t.Errorf("failed to add filtering: %v", err)
 		return
@@ -268,8 +269,8 @@ func TestManagerReset(t *testing.T) {
 func TestNotMatchByIP(t *testing.T) {
 	ifaceMock := &IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP: net.ParseIP("100.10.0.100"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("100.10.0.0"),
@@ -279,7 +280,7 @@ func TestNotMatchByIP(t *testing.T) {
 		},
 	}
 
-	m, err := Create(ifaceMock, false)
+	m, err := Create(ifaceMock, false, flowLogger)
 	if err != nil {
 		t.Errorf("failed to create Manager: %v", err)
 		return
@@ -292,9 +293,8 @@ func TestNotMatchByIP(t *testing.T) {
 	ip := net.ParseIP("0.0.0.0")
 	proto := fw.ProtocolUDP
 	action := fw.ActionAccept
-	comment := "Test rule"
 
-	_, err = m.AddPeerFiltering(ip, proto, nil, nil, action, "", comment)
+	_, err = m.AddPeerFiltering(nil, ip, proto, nil, nil, action, "")
 	if err != nil {
 		t.Errorf("failed to add filtering: %v", err)
 		return
@@ -328,7 +328,7 @@ func TestNotMatchByIP(t *testing.T) {
 		return
 	}
 
-	if m.dropFilter(buf.Bytes()) {
+	if m.dropFilter(buf.Bytes(), 0) {
 		t.Errorf("expected packet to be accepted")
 		return
 	}
@@ -347,7 +347,7 @@ func TestRemovePacketHook(t *testing.T) {
 	}
 
 	// creating manager instance
-	manager, err := Create(iface, false)
+	manager, err := Create(iface, false, flowLogger)
 	if err != nil {
 		t.Fatalf("Failed to create Manager: %s", err)
 	}
@@ -357,7 +357,7 @@ func TestRemovePacketHook(t *testing.T) {
 
 	// Add a UDP packet hook
 	hookFunc := func(data []byte) bool { return true }
-	hookID := manager.AddUDPPacketHook(false, net.IPv4(192, 168, 0, 1), 8080, hookFunc)
+	hookID := manager.AddUDPPacketHook(false, netip.MustParseAddr("192.168.0.1"), 8080, hookFunc)
 
 	// Assert the hook is added by finding it in the manager's outgoing rules
 	found := false
@@ -393,7 +393,7 @@ func TestRemovePacketHook(t *testing.T) {
 func TestProcessOutgoingHooks(t *testing.T) {
 	manager, err := Create(&IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-	}, false)
+	}, false, flowLogger)
 	require.NoError(t, err)
 
 	manager.wgNetwork = &net.IPNet{
@@ -401,7 +401,7 @@ func TestProcessOutgoingHooks(t *testing.T) {
 		Mask: net.CIDRMask(16, 32),
 	}
 	manager.udpTracker.Close()
-	manager.udpTracker = conntrack.NewUDPTracker(100*time.Millisecond, logger)
+	manager.udpTracker = conntrack.NewUDPTracker(100*time.Millisecond, logger, flowLogger)
 	defer func() {
 		require.NoError(t, manager.Close(nil))
 	}()
@@ -423,7 +423,7 @@ func TestProcessOutgoingHooks(t *testing.T) {
 	hookCalled := false
 	hookID := manager.AddUDPPacketHook(
 		false,
-		net.ParseIP("100.10.0.100"),
+		netip.MustParseAddr("100.10.0.100"),
 		53,
 		func([]byte) bool {
 			hookCalled = true
@@ -458,7 +458,7 @@ func TestProcessOutgoingHooks(t *testing.T) {
 	require.NoError(t, err)
 
 	// Test hook gets called
-	result := manager.processOutgoingHooks(buf.Bytes())
+	result := manager.processOutgoingHooks(buf.Bytes(), 0)
 	require.True(t, result)
 	require.True(t, hookCalled)
 
@@ -468,7 +468,7 @@ func TestProcessOutgoingHooks(t *testing.T) {
 	err = gopacket.SerializeLayers(buf, opts, ipv4)
 	require.NoError(t, err)
 
-	result = manager.processOutgoingHooks(buf.Bytes())
+	result = manager.processOutgoingHooks(buf.Bytes(), 0)
 	require.False(t, result)
 }
 
@@ -479,7 +479,7 @@ func TestUSPFilterCreatePerformance(t *testing.T) {
 			ifaceMock := &IFaceMock{
 				SetFilterFunc: func(device.PacketFilter) error { return nil },
 			}
-			manager, err := Create(ifaceMock, false)
+			manager, err := Create(ifaceMock, false, flowLogger)
 			require.NoError(t, err)
 			time.Sleep(time.Second)
 
@@ -494,7 +494,7 @@ func TestUSPFilterCreatePerformance(t *testing.T) {
 			start := time.Now()
 			for i := 0; i < testMax; i++ {
 				port := &fw.Port{Values: []uint16{uint16(1000 + i)}}
-				_, err = manager.AddPeerFiltering(ip, "tcp", nil, port, fw.ActionAccept, "", "accept HTTP traffic")
+				_, err = manager.AddPeerFiltering(nil, ip, "tcp", nil, port, fw.ActionAccept, "")
 
 				require.NoError(t, err, "failed to add rule")
 			}
@@ -506,7 +506,7 @@ func TestUSPFilterCreatePerformance(t *testing.T) {
 func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	manager, err := Create(&IFaceMock{
 		SetFilterFunc: func(device.PacketFilter) error { return nil },
-	}, false)
+	}, false, flowLogger)
 	require.NoError(t, err)
 
 	manager.wgNetwork = &net.IPNet{
@@ -515,7 +515,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	}
 
 	manager.udpTracker.Close() // Close the existing tracker
-	manager.udpTracker = conntrack.NewUDPTracker(200*time.Millisecond, logger)
+	manager.udpTracker = conntrack.NewUDPTracker(200*time.Millisecond, logger, flowLogger)
 	manager.decoders = sync.Pool{
 		New: func() any {
 			d := &decoder{
@@ -534,8 +534,8 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	}()
 
 	// Set up packet parameters
-	srcIP := net.ParseIP("100.10.0.1")
+	srcIP := netip.MustParseAddr("100.10.0.1")
-	dstIP := net.ParseIP("100.10.0.100")
+	dstIP := netip.MustParseAddr("100.10.0.100")
 	srcPort := uint16(51334)
 	dstPort := uint16(53)
 
@@ -543,8 +543,8 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	outboundIPv4 := &layers.IPv4{
 		TTL:      64,
 		Version:  4,
-		SrcIP:    srcIP,
+		SrcIP:    srcIP.AsSlice(),
-		DstIP:    dstIP,
+		DstIP:    dstIP.AsSlice(),
 		Protocol: layers.IPProtocolUDP,
 	}
 	outboundUDP := &layers.UDP{
@@ -569,15 +569,15 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	require.NoError(t, err)
 
 	// Process outbound packet and verify connection tracking
-	drop := manager.DropOutgoing(outboundBuf.Bytes())
+	drop := manager.DropOutgoing(outboundBuf.Bytes(), 0)
 	require.False(t, drop, "Initial outbound packet should not be dropped")
 
 	// Verify connection was tracked
 	conn, exists := manager.udpTracker.GetConnection(srcIP, srcPort, dstIP, dstPort)
 
 	require.True(t, exists, "Connection should be tracked after outbound packet")
-	require.True(t, conntrack.ValidateIPs(conntrack.MakeIPAddr(srcIP), conn.SourceIP), "Source IP should match")
+	require.True(t, srcIP.Compare(conn.SourceIP) == 0, "Source IP should match")
-	require.True(t, conntrack.ValidateIPs(conntrack.MakeIPAddr(dstIP), conn.DestIP), "Destination IP should match")
+	require.True(t, dstIP.Compare(conn.DestIP) == 0, "Destination IP should match")
 	require.Equal(t, srcPort, conn.SourcePort, "Source port should match")
 	require.Equal(t, dstPort, conn.DestPort, "Destination port should match")
 
@@ -585,8 +585,8 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	inboundIPv4 := &layers.IPv4{
 		TTL:      64,
 		Version:  4,
-		SrcIP:    dstIP, // Original destination is now source
+		SrcIP:    dstIP.AsSlice(), // Original destination is now source
-		DstIP:    srcIP, // Original source is now destination
+		DstIP:    srcIP.AsSlice(), // Original source is now destination
 		Protocol: layers.IPProtocolUDP,
 	}
 	inboundUDP := &layers.UDP{
@@ -636,7 +636,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	for _, cp := range checkPoints {
 		time.Sleep(cp.sleep)
 
-		drop = manager.dropFilter(inboundBuf.Bytes())
+		drop = manager.dropFilter(inboundBuf.Bytes(), 0)
 		require.Equal(t, cp.shouldAllow, !drop, cp.description)
 
 		// If the connection should still be valid, verify it exists
@@ -685,7 +685,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 	}
 
 	// Create a new outbound connection for invalid tests
-	drop = manager.processOutgoingHooks(outboundBuf.Bytes())
+	drop = manager.processOutgoingHooks(outboundBuf.Bytes(), 0)
 	require.False(t, drop, "Second outbound packet should not be dropped")
 
 	for _, tc := range invalidCases {
@@ -707,7 +707,7 @@ func TestStatefulFirewall_UDPTracking(t *testing.T) {
 			require.NoError(t, err)
 
 			// Verify the invalid packet is dropped
-			drop = manager.dropFilter(testBuf.Bytes())
+			drop = manager.dropFilter(testBuf.Bytes(), 0)
 			require.True(t, drop, tc.description)
 		})
 	}

client/iface/bind/ice_bind.go

@@ -13,6 +13,8 @@ import (
 	"golang.org/x/net/ipv4"
 	"golang.org/x/net/ipv6"
 	wgConn "golang.zx2c4.com/wireguard/conn"
+
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type RecvMessage struct {
@@ -51,9 +53,10 @@ type ICEBind struct {
 
 	muUDPMux sync.Mutex
 	udpMux   *UniversalUDPMuxDefault
+	address  wgaddr.Address
 }
 
-func NewICEBind(transportNet transport.Net, filterFn FilterFn) *ICEBind {
+func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Address) *ICEBind {
 	b, _ := wgConn.NewStdNetBind().(*wgConn.StdNetBind)
 	ib := &ICEBind{
 		StdNetBind:   b,
@@ -63,6 +66,7 @@ func NewICEBind(transportNet transport.Net, filterFn FilterFn) *ICEBind {
 		endpoints:    make(map[netip.Addr]net.Conn),
 		closedChan:   make(chan struct{}),
 		closed:       true,
+		address:      address,
 	}
 
 	rc := receiverCreator{
@@ -145,6 +149,7 @@ func (s *ICEBind) createIPv4ReceiverFn(pc *ipv4.PacketConn, conn *net.UDPConn, r
 			UDPConn:   conn,
 			Net:       s.transportNet,
 			FilterFn:  s.filterFn,
+			WGAddress: s.address,
 		},
 	)
 	return func(bufs [][]byte, sizes []int, eps []wgConn.Endpoint) (n int, err error) {

client/iface/bind/udp_mux_universal.go

@@ -17,6 +17,8 @@ import (
 	"github.com/pion/logging"
 	"github.com/pion/stun/v2"
 	"github.com/pion/transport/v3"
+
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // FilterFn is a function that filters out candidates based on the address.
@@ -41,6 +43,7 @@ type UniversalUDPMuxParams struct {
 	XORMappedAddrCacheTTL time.Duration
 	Net                   transport.Net
 	FilterFn              FilterFn
+	WGAddress             wgaddr.Address
 }
 
 // NewUniversalUDPMuxDefault creates an implementation of UniversalUDPMux embedding UDPMux
@@ -64,6 +67,7 @@ func NewUniversalUDPMuxDefault(params UniversalUDPMuxParams) *UniversalUDPMuxDef
 		mux:        m,
 		logger:     params.Logger,
 		filterFn:   params.FilterFn,
+		address:    params.WGAddress,
 	}
 
 	// embed UDPMux
@@ -118,6 +122,7 @@ type udpConn struct {
 	filterFn FilterFn
 	// TODO: reset cache on route changes
 	addrCache sync.Map
+	address   wgaddr.Address
 }
 
 func (u *udpConn) WriteTo(b []byte, addr net.Addr) (int, error) {
@@ -159,6 +164,11 @@ func (u *udpConn) performFilterCheck(addr net.Addr) error {
 		return nil
 	}
 
+	if u.address.Network.Contains(a.AsSlice()) {
+		log.Warnf("Address %s is part of the NetBird network %s, refusing to write", addr, u.address)
+		return fmt.Errorf("address %s is part of the NetBird network %s, refusing to write", addr, u.address)
+	}
+
 	if isRouted, prefix, err := u.filterFn(a); err != nil {
 		log.Errorf("Failed to check if address %s is routed: %v", addr, err)
 	} else {

client/iface/device.go

@@ -9,13 +9,14 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type WGTunDevice interface {
 	Create() (device.WGConfigurer, error)
 	Up() (*bind.UniversalUDPMuxDefault, error)
-	UpdateAddr(address WGAddress) error
+	UpdateAddr(address wgaddr.Address) error
-	WgAddress() WGAddress
+	WgAddress() wgaddr.Address
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice

client/iface/device/device_android.go

@@ -13,11 +13,12 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // WGTunDevice ignore the WGTunDevice interface on Android because the creation of the tun device is different on this platform
 type WGTunDevice struct {
-	address    WGAddress
+	address    wgaddr.Address
 	port       int
 	key        string
 	mtu        int
@@ -31,7 +32,7 @@ type WGTunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(address WGAddress, port int, key string, mtu int, iceBind *bind.ICEBind, tunAdapter TunAdapter) *WGTunDevice {
+func NewTunDevice(address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind, tunAdapter TunAdapter) *WGTunDevice {
 	return &WGTunDevice{
 		address:    address,
 		port:       port,
@@ -93,7 +94,7 @@ func (t *WGTunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return udpMux, nil
 }
 
-func (t *WGTunDevice) UpdateAddr(addr WGAddress) error {
+func (t *WGTunDevice) UpdateAddr(addr wgaddr.Address) error {
 	// todo implement
 	return nil
 }
@@ -123,7 +124,7 @@ func (t *WGTunDevice) DeviceName() string {
 	return t.name
 }
 
-func (t *WGTunDevice) WgAddress() WGAddress {
+func (t *WGTunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/device_darwin.go

@@ -13,11 +13,12 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type TunDevice struct {
 	name    string
-	address WGAddress
+	address wgaddr.Address
 	port    int
 	key     string
 	mtu     int
@@ -29,7 +30,7 @@ type TunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address WGAddress, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -85,7 +86,7 @@ func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return udpMux, nil
 }
 
-func (t *TunDevice) UpdateAddr(address WGAddress) error {
+func (t *TunDevice) UpdateAddr(address wgaddr.Address) error {
 	t.address = address
 	return t.assignAddr()
 }
@@ -106,7 +107,7 @@ func (t *TunDevice) Close() error {
 	return nil
 }
 
-func (t *TunDevice) WgAddress() WGAddress {
+func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/device_filter.go

@@ -2,6 +2,7 @@ package device
 
 import (
 	"net"
+	"net/netip"
 	"sync"
 
 	"golang.zx2c4.com/wireguard/tun"
@@ -10,16 +11,16 @@ import (
 // PacketFilter interface for firewall abilities
 type PacketFilter interface {
 	// DropOutgoing filter outgoing packets from host to external destinations
-	DropOutgoing(packetData []byte) bool
+	DropOutgoing(packetData []byte, size int) bool
 
 	// DropIncoming filter incoming packets from external sources to host
-	DropIncoming(packetData []byte) bool
+	DropIncoming(packetData []byte, size int) bool
 
 	// AddUDPPacketHook calls hook when UDP packet from given direction matched
 	//
 	// Hook function returns flag which indicates should be the matched package dropped or not.
 	// Hook function receives raw network packet data as argument.
-	AddUDPPacketHook(in bool, ip net.IP, dPort uint16, hook func(packet []byte) bool) string
+	AddUDPPacketHook(in bool, ip netip.Addr, dPort uint16, hook func(packet []byte) bool) string
 
 	// RemovePacketHook removes hook by ID
 	RemovePacketHook(hookID string) error
@@ -57,7 +58,7 @@ func (d *FilteredDevice) Read(bufs [][]byte, sizes []int, offset int) (n int, er
 	}
 
 	for i := 0; i < n; i++ {
-		if filter.DropOutgoing(bufs[i][offset : offset+sizes[i]]) {
+		if filter.DropOutgoing(bufs[i][offset:offset+sizes[i]], sizes[i]) {
 			bufs = append(bufs[:i], bufs[i+1:]...)
 			sizes = append(sizes[:i], sizes[i+1:]...)
 			n--
@@ -81,7 +82,7 @@ func (d *FilteredDevice) Write(bufs [][]byte, offset int) (int, error) {
 	filteredBufs := make([][]byte, 0, len(bufs))
 	dropped := 0
 	for _, buf := range bufs {
-		if !filter.DropIncoming(buf[offset:]) {
+		if !filter.DropIncoming(buf[offset:], len(buf)) {
 			filteredBufs = append(filteredBufs, buf)
 			dropped++
 		}

client/iface/device/device_filter_test.go

@@ -146,7 +146,7 @@ func TestDeviceWrapperRead(t *testing.T) {
 		tun.EXPECT().Write(mockBufs, 0).Return(0, nil)
 
 		filter := mocks.NewMockPacketFilter(ctrl)
-		filter.EXPECT().DropIncoming(gomock.Any()).Return(true)
+		filter.EXPECT().DropIncoming(gomock.Any(), gomock.Any()).Return(true)
 
 		wrapped := newDeviceFilter(tun)
 		wrapped.filter = filter
@@ -201,7 +201,7 @@ func TestDeviceWrapperRead(t *testing.T) {
 				return 1, nil
 			})
 		filter := mocks.NewMockPacketFilter(ctrl)
-		filter.EXPECT().DropOutgoing(gomock.Any()).Return(true)
+		filter.EXPECT().DropOutgoing(gomock.Any(), gomock.Any()).Return(true)
 
 		wrapped := newDeviceFilter(tun)
 		wrapped.filter = filter

client/iface/device/device_ios.go

@@ -14,11 +14,12 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type TunDevice struct {
 	name    string
-	address WGAddress
+	address wgaddr.Address
 	port    int
 	key     string
 	iceBind *bind.ICEBind
@@ -30,7 +31,7 @@ type TunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address WGAddress, port int, key string, iceBind *bind.ICEBind, tunFd int) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, iceBind *bind.ICEBind, tunFd int) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -120,11 +121,11 @@ func (t *TunDevice) Close() error {
 	return nil
 }
 
-func (t *TunDevice) WgAddress() WGAddress {
+func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
-func (t *TunDevice) UpdateAddr(addr WGAddress) error {
+func (t *TunDevice) UpdateAddr(_ wgaddr.Address) error {
 	// todo implement
 	return nil
 }

client/iface/device/device_kernel_unix.go

@@ -14,12 +14,13 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/sharedsock"
 )
 
 type TunKernelDevice struct {
 	name         string
-	address      WGAddress
+	address      wgaddr.Address
 	wgPort       int
 	key          string
 	mtu          int
@@ -34,7 +35,7 @@ type TunKernelDevice struct {
 	filterFn bind.FilterFn
 }
 
-func NewKernelDevice(name string, address WGAddress, wgPort int, key string, mtu int, transportNet transport.Net) *TunKernelDevice {
+func NewKernelDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, transportNet transport.Net) *TunKernelDevice {
 	ctx, cancel := context.WithCancel(context.Background())
 	return &TunKernelDevice{
 		ctx:          ctx,
@@ -102,6 +103,7 @@ func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 		UDPConn:   rawSock,
 		Net:       t.transportNet,
 		FilterFn:  t.filterFn,
+		WGAddress: t.address,
 	}
 	mux := bind.NewUniversalUDPMuxDefault(bindParams)
 	go mux.ReadFromConn(t.ctx)
@@ -112,7 +114,7 @@ func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return t.udpMux, nil
 }
 
-func (t *TunKernelDevice) UpdateAddr(address WGAddress) error {
+func (t *TunKernelDevice) UpdateAddr(address wgaddr.Address) error {
 	t.address = address
 	return t.assignAddr()
 }
@@ -145,7 +147,7 @@ func (t *TunKernelDevice) Close() error {
 	return closErr
 }
 
-func (t *TunKernelDevice) WgAddress() WGAddress {
+func (t *TunKernelDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/device_netstack.go

@@ -13,12 +13,13 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	nbnetstack "github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	nbnet "github.com/netbirdio/netbird/util/net"
 )
 
 type TunNetstackDevice struct {
 	name          string
-	address       WGAddress
+	address       wgaddr.Address
 	port          int
 	key           string
 	mtu           int
@@ -34,7 +35,7 @@ type TunNetstackDevice struct {
 	net *netstack.Net
 }
 
-func NewNetstackDevice(name string, address WGAddress, wgPort int, key string, mtu int, iceBind *bind.ICEBind, listenAddress string) *TunNetstackDevice {
+func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, iceBind *bind.ICEBind, listenAddress string) *TunNetstackDevice {
 	return &TunNetstackDevice{
 		name:          name,
 		address:       address,
@@ -97,7 +98,7 @@ func (t *TunNetstackDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return udpMux, nil
 }
 
-func (t *TunNetstackDevice) UpdateAddr(WGAddress) error {
+func (t *TunNetstackDevice) UpdateAddr(wgaddr.Address) error {
 	return nil
 }
 
@@ -116,7 +117,7 @@ func (t *TunNetstackDevice) Close() error {
 	return nil
 }
 
-func (t *TunNetstackDevice) WgAddress() WGAddress {
+func (t *TunNetstackDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/device_usp_unix.go

@@ -12,11 +12,12 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type USPDevice struct {
 	name    string
-	address WGAddress
+	address wgaddr.Address
 	port    int
 	key     string
 	mtu     int
@@ -28,7 +29,7 @@ type USPDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewUSPDevice(name string, address WGAddress, port int, key string, mtu int, iceBind *bind.ICEBind) *USPDevice {
+func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *USPDevice {
 	log.Infof("using userspace bind mode")
 
 	return &USPDevice{
@@ -93,7 +94,7 @@ func (t *USPDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return udpMux, nil
 }
 
-func (t *USPDevice) UpdateAddr(address WGAddress) error {
+func (t *USPDevice) UpdateAddr(address wgaddr.Address) error {
 	t.address = address
 	return t.assignAddr()
 }
@@ -113,7 +114,7 @@ func (t *USPDevice) Close() error {
 	return nil
 }
 
-func (t *USPDevice) WgAddress() WGAddress {
+func (t *USPDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/device_windows.go

@@ -13,13 +13,14 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 const defaultWindowsGUIDSTring = "{f2f29e61-d91f-4d76-8151-119b20c4bdeb}"
 
 type TunDevice struct {
 	name    string
-	address WGAddress
+	address wgaddr.Address
 	port    int
 	key     string
 	mtu     int
@@ -32,7 +33,7 @@ type TunDevice struct {
 	configurer      WGConfigurer
 }
 
-func NewTunDevice(name string, address WGAddress, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -118,7 +119,7 @@ func (t *TunDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 	return udpMux, nil
 }
 
-func (t *TunDevice) UpdateAddr(address WGAddress) error {
+func (t *TunDevice) UpdateAddr(address wgaddr.Address) error {
 	t.address = address
 	return t.assignAddr()
 }
@@ -139,7 +140,7 @@ func (t *TunDevice) Close() error {
 	}
 	return nil
 }
-func (t *TunDevice) WgAddress() WGAddress {
+func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 

client/iface/device/wg_link_freebsd.go

@@ -6,6 +6,7 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	"github.com/netbirdio/netbird/client/iface/freebsd"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type wgLink struct {
@@ -56,7 +57,7 @@ func (l *wgLink) up() error {
 	return nil
 }
 
-func (l *wgLink) assignAddr(address WGAddress) error {
+func (l *wgLink) assignAddr(address wgaddr.Address) error {
 	link, err := freebsd.LinkByName(l.name)
 	if err != nil {
 		return fmt.Errorf("link by name: %w", err)

client/iface/device/wg_link_linux.go

@@ -8,6 +8,8 @@ import (
 
 	log "github.com/sirupsen/logrus"
 	"github.com/vishvananda/netlink"
+
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type wgLink struct {
@@ -90,7 +92,7 @@ func (l *wgLink) up() error {
 	return nil
 }
 
-func (l *wgLink) assignAddr(address WGAddress) error {
+func (l *wgLink) assignAddr(address wgaddr.Address) error {
 	//delete existing addresses
 	list, err := netlink.AddrList(l, 0)
 	if err != nil {

client/iface/device_android.go

@@ -7,13 +7,14 @@ import (
 
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 type WGTunDevice interface {
 	Create(routes []string, dns string, searchDomains []string) (device.WGConfigurer, error)
 	Up() (*bind.UniversalUDPMuxDefault, error)
-	UpdateAddr(address WGAddress) error
+	UpdateAddr(address wgaddr.Address) error
-	WgAddress() WGAddress
+	WgAddress() wgaddr.Address
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice

client/iface/iface.go

@@ -19,6 +19,7 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
@@ -28,8 +29,6 @@ const (
 	WgInterfaceDefault = configurer.WgInterfaceDefault
 )
 
-type WGAddress = device.WGAddress
-
 type wgProxyFactory interface {
 	GetProxy() wgproxy.Proxy
 	Free() error
@@ -72,7 +71,7 @@ func (w *WGIface) Name() string {
 }
 
 // Address returns the interface address
-func (w *WGIface) Address() device.WGAddress {
+func (w *WGIface) Address() wgaddr.Address {
 	return w.tun.WgAddress()
 }
 
@@ -103,7 +102,7 @@ func (w *WGIface) UpdateAddr(newAddr string) error {
 	w.mu.Lock()
 	defer w.mu.Unlock()
 
-	addr, err := device.ParseWGAddress(newAddr)
+	addr, err := wgaddr.ParseWGAddress(newAddr)
 	if err != nil {
 		return err
 	}

client/iface/iface_new_android.go

@@ -3,17 +3,18 @@ package iface
 import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
 // NewWGIFace Creates a new WireGuard interface instance
 func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
-	wgAddress, err := device.ParseWGAddress(opts.Address)
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
 	if err != nil {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 
 	wgIFace := &WGIface{
 		userspaceBind:  true,

client/iface/iface_new_darwin.go

@@ -6,17 +6,18 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
 // NewWGIFace Creates a new WireGuard interface instance
 func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
-	wgAddress, err := device.ParseWGAddress(opts.Address)
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
 	if err != nil {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {

client/iface/iface_new_ios.go

@@ -5,17 +5,18 @@ package iface
 import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
 // NewWGIFace Creates a new WireGuard interface instance
 func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
-	wgAddress, err := device.ParseWGAddress(opts.Address)
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
 	if err != nil {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 
 	wgIFace := &WGIface{
 		tun:            device.NewTunDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, iceBind, opts.MobileArgs.TunFd),

client/iface/iface_new_unix.go

@@ -8,12 +8,13 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/iface/netstack"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
 // NewWGIFace Creates a new WireGuard interface instance
 func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
-	wgAddress, err := device.ParseWGAddress(opts.Address)
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
 	if err != nil {
 		return nil, err
 	}
@@ -21,7 +22,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	wgIFace := &WGIface{}
 
 	if netstack.IsEnabled() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 		wgIFace.tun = device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, netstack.ListenAddr())
 		wgIFace.userspaceBind = true
 		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)
@@ -34,7 +35,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return wgIFace, nil
 	}
 	if device.ModuleTunIsLoaded() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 		wgIFace.tun = device.NewUSPDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind)
 		wgIFace.userspaceBind = true
 		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)

client/iface/iface_new_windows.go

@@ -4,16 +4,17 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/iface/netstack"
+	wgaddr "github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
 // NewWGIFace Creates a new WireGuard interface instance
 func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
-	wgAddress, err := device.ParseWGAddress(opts.Address)
+	wgAddress, err := wgaddr.ParseWGAddress(opts.Address)
 	if err != nil {
 		return nil, err
 	}
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {

client/iface/mocks/filter.go

@@ -6,6 +6,7 @@ package mocks
 
 import (
 	net "net"
+	"net/netip"
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
@@ -35,7 +36,7 @@ func (m *MockPacketFilter) EXPECT() *MockPacketFilterMockRecorder {
 }
 
 // AddUDPPacketHook mocks base method.
-func (m *MockPacketFilter) AddUDPPacketHook(arg0 bool, arg1 net.IP, arg2 uint16, arg3 func([]byte) bool) string {
+func (m *MockPacketFilter) AddUDPPacketHook(arg0 bool, arg1 netip.Addr, arg2 uint16, arg3 func([]byte) bool) string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "AddUDPPacketHook", arg0, arg1, arg2, arg3)
 	ret0, _ := ret[0].(string)
@@ -49,31 +50,31 @@ func (mr *MockPacketFilterMockRecorder) AddUDPPacketHook(arg0, arg1, arg2, arg3
 }
 
 // DropIncoming mocks base method.
-func (m *MockPacketFilter) DropIncoming(arg0 []byte) bool {
+func (m *MockPacketFilter) DropIncoming(arg0 []byte, arg1 int) bool {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "DropIncoming", arg0)
+	ret := m.ctrl.Call(m, "DropIncoming", arg0, arg1)
 	ret0, _ := ret[0].(bool)
 	return ret0
 }
 
 // DropIncoming indicates an expected call of DropIncoming.
-func (mr *MockPacketFilterMockRecorder) DropIncoming(arg0 interface{}) *gomock.Call {
+func (mr *MockPacketFilterMockRecorder) DropIncoming(arg0 interface{}, arg1 any) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DropIncoming", reflect.TypeOf((*MockPacketFilter)(nil).DropIncoming), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DropIncoming", reflect.TypeOf((*MockPacketFilter)(nil).DropIncoming), arg0, arg1)
 }
 
 // DropOutgoing mocks base method.
-func (m *MockPacketFilter) DropOutgoing(arg0 []byte) bool {
+func (m *MockPacketFilter) DropOutgoing(arg0 []byte, arg1 int) bool {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "DropOutgoing", arg0)
+	ret := m.ctrl.Call(m, "DropOutgoing", arg0, arg1)
 	ret0, _ := ret[0].(bool)
 	return ret0
 }
 
 // DropOutgoing indicates an expected call of DropOutgoing.
-func (mr *MockPacketFilterMockRecorder) DropOutgoing(arg0 interface{}) *gomock.Call {
+func (mr *MockPacketFilterMockRecorder) DropOutgoing(arg0 interface{}, arg1 any) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DropOutgoing", reflect.TypeOf((*MockPacketFilter)(nil).DropOutgoing), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DropOutgoing", reflect.TypeOf((*MockPacketFilter)(nil).DropOutgoing), arg0, arg1)
 }
 
 // RemovePacketHook mocks base method.

client/iface/wgaddr/address.go

@@ -1,29 +1,29 @@
-package device
+package wgaddr
 
 import (
 	"fmt"
 	"net"
 )
 
-// WGAddress WireGuard parsed address
+// Address WireGuard parsed address
-type WGAddress struct {
+type Address struct {
 	IP      net.IP
 	Network *net.IPNet
 }
 
 // ParseWGAddress parse a string ("1.2.3.4/24") address to WG Address
-func ParseWGAddress(address string) (WGAddress, error) {
+func ParseWGAddress(address string) (Address, error) {
 	ip, network, err := net.ParseCIDR(address)
 	if err != nil {
-		return WGAddress{}, err
+		return Address{}, err
 	}
-	return WGAddress{
+	return Address{
 		IP:      ip,
 		Network: network,
 	}, nil
 }
 
-func (addr WGAddress) String() string {
+func (addr Address) String() string {
 	maskSize, _ := addr.Network.Mask.Size()
 	return fmt.Sprintf("%s/%d", addr.IP.String(), maskSize)
 }

client/installer.nsis

@@ -22,6 +22,8 @@
 !define UI_REG_APP_PATH "Software\Microsoft\Windows\CurrentVersion\App Paths\${UI_APP_EXE}"
 !define UI_UNINSTALL_PATH "Software\Microsoft\Windows\CurrentVersion\Uninstall\${UI_APP_NAME}"
 
+!define AUTOSTART_REG_KEY "Software\Microsoft\Windows\CurrentVersion\Run"
+
 Unicode True
 
 ######################################################################
@@ -68,6 +70,9 @@ ShowInstDetails Show
 
 !insertmacro MUI_PAGE_DIRECTORY
 
+; Custom page for autostart checkbox
+Page custom AutostartPage AutostartPageLeave
+
 !insertmacro MUI_PAGE_INSTFILES
 
 !insertmacro MUI_PAGE_FINISH
@@ -80,8 +85,36 @@ ShowInstDetails Show
 
 !insertmacro MUI_LANGUAGE "English"
 
+; Variables for autostart option
+Var AutostartCheckbox
+Var AutostartEnabled
+
 ######################################################################
 
+; Function to create the autostart options page
+Function AutostartPage
+  !insertmacro MUI_HEADER_TEXT "Startup Options" "Configure how ${APP_NAME} launches with Windows."
+
+  nsDialogs::Create 1018
+  Pop $0
+
+  ${If} $0 == error
+    Abort
+  ${EndIf}
+
+  ${NSD_CreateCheckbox} 0 20u 100% 10u "Start ${APP_NAME} UI automatically when Windows starts"
+  Pop $AutostartCheckbox
+  ${NSD_Check} $AutostartCheckbox ; Default to checked
+  StrCpy $AutostartEnabled "1" ; Default to enabled
+
+  nsDialogs::Show
+FunctionEnd
+
+; Function to handle leaving the autostart page
+Function AutostartPageLeave
+  ${NSD_GetState} $AutostartCheckbox $AutostartEnabled
+FunctionEnd
+
 Function GetAppFromCommand
 Exch $1
 Push $2
@@ -163,6 +196,16 @@ WriteRegStr ${REG_ROOT} "${UNINSTALL_PATH}"  "Publisher" "${COMP_NAME}"
 
 WriteRegStr ${REG_ROOT} "${UI_REG_APP_PATH}" "" "$INSTDIR\${UI_APP_EXE}"
 
+; Create autostart registry entry based on checkbox
+DetailPrint "Autostart enabled: $AutostartEnabled"
+${If} $AutostartEnabled == "1"
+    WriteRegStr HKCU "${AUTOSTART_REG_KEY}" "${APP_NAME}" "$INSTDIR\${UI_APP_EXE}.exe"
+    DetailPrint "Added autostart registry entry: $INSTDIR\${UI_APP_EXE}.exe"
+${Else}
+    DeleteRegValue HKCU "${AUTOSTART_REG_KEY}" "${APP_NAME}"
+    DetailPrint "Autostart not enabled by user"
+${EndIf}
+
 EnVar::SetHKLM
 EnVar::AddValueEx "path" "$INSTDIR"
 
@@ -186,7 +229,10 @@ ExecWait '"$INSTDIR\${MAIN_APP_EXE}" service stop'
 ExecWait '"$INSTDIR\${MAIN_APP_EXE}" service uninstall'
 
 # kill ui client
-ExecWait `taskkill /im ${UI_APP_EXE}.exe`
+ExecWait `taskkill /im ${UI_APP_EXE}.exe /f`
+
+; Remove autostart registry entry
+DeleteRegValue HKCU "${AUTOSTART_REG_KEY}" "${APP_NAME}"
 
 # wait the service uninstall take unblock the executable
 Sleep 3000

client/internal/acl/id/id.go

@@ -12,7 +12,7 @@ import (
 
 type RuleID string
 
-func (r RuleID) GetRuleID() string {
+func (r RuleID) ID() string {
 	return string(r)
 }
 

client/internal/acl/manager.go

@@ -240,12 +240,12 @@ func (d *DefaultManager) applyRouteACL(rule *mgmProto.RouteFirewallRule) (id.Rul
 
 	dPorts := convertPortInfo(rule.PortInfo)
 
-	addedRule, err := d.firewall.AddRouteFiltering(sources, destination, protocol, nil, dPorts, action)
+	addedRule, err := d.firewall.AddRouteFiltering(rule.Id, sources, destination, protocol, nil, dPorts, action)
 	if err != nil {
 		return "", fmt.Errorf("add route rule: %w", err)
 	}
 
-	return id.RuleID(addedRule.GetRuleID()), nil
+	return id.RuleID(addedRule.ID()), nil
 }
 
 func (d *DefaultManager) protoRuleToFirewallRule(
@@ -281,7 +281,7 @@ func (d *DefaultManager) protoRuleToFirewallRule(
 		}
 	}
 
-	ruleID := d.getPeerRuleID(ip, protocol, int(r.Direction), port, action, "")
+	ruleID := d.getPeerRuleID(ip, protocol, int(r.Direction), port, action)
 	if rulesPair, ok := d.peerRulesPairs[ruleID]; ok {
 		return ruleID, rulesPair, nil
 	}
@@ -289,11 +289,11 @@ func (d *DefaultManager) protoRuleToFirewallRule(
 	var rules []firewall.Rule
 	switch r.Direction {
 	case mgmProto.RuleDirection_IN:
-		rules, err = d.addInRules(ip, protocol, port, action, ipsetName, "")
+		rules, err = d.addInRules(r.Id, ip, protocol, port, action, ipsetName)
 	case mgmProto.RuleDirection_OUT:
 		// TODO: Remove this soon. Outbound rules are obsolete.
 		// We only maintain this for return traffic (inbound dir) which is now handled by the stateful firewall already
-		rules, err = d.addOutRules(ip, protocol, port, action, ipsetName, "")
+		rules, err = d.addOutRules(r.Id, ip, protocol, port, action, ipsetName)
 	default:
 		return "", nil, fmt.Errorf("invalid direction, skipping firewall rule")
 	}
@@ -322,14 +322,14 @@ func portInfoEmpty(portInfo *mgmProto.PortInfo) bool {
 }
 
 func (d *DefaultManager) addInRules(
+	id []byte,
 	ip net.IP,
 	protocol firewall.Protocol,
 	port *firewall.Port,
 	action firewall.Action,
 	ipsetName string,
-	comment string,
 ) ([]firewall.Rule, error) {
-	rule, err := d.firewall.AddPeerFiltering(ip, protocol, nil, port, action, ipsetName, comment)
+	rule, err := d.firewall.AddPeerFiltering(id, ip, protocol, nil, port, action, ipsetName)
 	if err != nil {
 		return nil, fmt.Errorf("add firewall rule: %w", err)
 	}
@@ -338,18 +338,18 @@ func (d *DefaultManager) addInRules(
 }
 
 func (d *DefaultManager) addOutRules(
+	id []byte,
 	ip net.IP,
 	protocol firewall.Protocol,
 	port *firewall.Port,
 	action firewall.Action,
 	ipsetName string,
-	comment string,
 ) ([]firewall.Rule, error) {
 	if shouldSkipInvertedRule(protocol, port) {
 		return nil, nil
 	}
 
-	rule, err := d.firewall.AddPeerFiltering(ip, protocol, port, nil, action, ipsetName, comment)
+	rule, err := d.firewall.AddPeerFiltering(id, ip, protocol, port, nil, action, ipsetName)
 	if err != nil {
 		return nil, fmt.Errorf("add firewall rule: %w", err)
 	}
@@ -364,9 +364,8 @@ func (d *DefaultManager) getPeerRuleID(
 	direction int,
 	port *firewall.Port,
 	action firewall.Action,
-	comment string,
 ) id.RuleID {
-	idStr := ip.String() + string(proto) + strconv.Itoa(direction) + strconv.Itoa(int(action)) + comment
+	idStr := ip.String() + string(proto) + strconv.Itoa(direction) + strconv.Itoa(int(action))
 	if port != nil {
 		idStr += port.String()
 	}
@@ -515,7 +514,7 @@ func (d *DefaultManager) rollBack(newRulePairs map[id.RuleID][]firewall.Rule) {
 	for _, rules := range newRulePairs {
 		for _, rule := range rules {
 			if err := d.firewall.DeletePeerRule(rule); err != nil {
-				log.Errorf("failed to delete new firewall rule (id: %v) during rollback: %v", rule.GetRuleID(), err)
+				log.Errorf("failed to delete new firewall rule (id: %v) during rollback: %v", rule.ID(), err)
 			}
 		}
 	}

client/internal/acl/manager_test.go

@@ -1,6 +1,7 @@
 package acl
 
 import (
+	"context"
 	"net"
 	"testing"
 
@@ -8,11 +9,14 @@ import (
 
 	"github.com/netbirdio/netbird/client/firewall"
 	"github.com/netbirdio/netbird/client/firewall/manager"
-	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/internal/acl/mocks"
+	"github.com/netbirdio/netbird/client/internal/netflow"
 	mgmProto "github.com/netbirdio/netbird/management/proto"
 )
 
+var flowLogger = netflow.NewManager(context.Background(), nil, []byte{}, nil).GetLogger()
+
 func TestDefaultManager(t *testing.T) {
 	networkMap := &mgmProto.NetworkMap{
 		FirewallRules: []*mgmProto.FirewallRule{
@@ -45,14 +49,14 @@ func TestDefaultManager(t *testing.T) {
 	}
 
 	ifaceMock.EXPECT().Name().Return("lo").AnyTimes()
-	ifaceMock.EXPECT().Address().Return(iface.WGAddress{
+	ifaceMock.EXPECT().Address().Return(wgaddr.Address{
 		IP:      ip,
 		Network: network,
 	}).AnyTimes()
 	ifaceMock.EXPECT().GetWGDevice().Return(nil).AnyTimes()
 
 	// we receive one rule from the management so for testing purposes ignore it
-	fw, err := firewall.NewFirewall(ifaceMock, nil, false)
+	fw, err := firewall.NewFirewall(ifaceMock, nil, flowLogger, false)
 	if err != nil {
 		t.Errorf("create firewall: %v", err)
 		return
@@ -74,7 +78,7 @@ func TestDefaultManager(t *testing.T) {
 	t.Run("add extra rules", func(t *testing.T) {
 		existedPairs := map[string]struct{}{}
 		for id := range acl.peerRulesPairs {
-			existedPairs[id.GetRuleID()] = struct{}{}
+			existedPairs[id.ID()] = struct{}{}
 		}
 
 		// remove first rule
@@ -100,7 +104,7 @@ func TestDefaultManager(t *testing.T) {
 		// check that old rule was removed
 		previousCount := 0
 		for id := range acl.peerRulesPairs {
-			if _, ok := existedPairs[id.GetRuleID()]; ok {
+			if _, ok := existedPairs[id.ID()]; ok {
 				previousCount++
 			}
 		}
@@ -339,14 +343,14 @@ func TestDefaultManagerEnableSSHRules(t *testing.T) {
 	}
 
 	ifaceMock.EXPECT().Name().Return("lo").AnyTimes()
-	ifaceMock.EXPECT().Address().Return(iface.WGAddress{
+	ifaceMock.EXPECT().Address().Return(wgaddr.Address{
 		IP:      ip,
 		Network: network,
 	}).AnyTimes()
 	ifaceMock.EXPECT().GetWGDevice().Return(nil).AnyTimes()
 
 	// we receive one rule from the management so for testing purposes ignore it
-	fw, err := firewall.NewFirewall(ifaceMock, nil, false)
+	fw, err := firewall.NewFirewall(ifaceMock, nil, flowLogger, false)
 	if err != nil {
 		t.Errorf("create firewall: %v", err)
 		return

client/internal/acl/mocks/iface_mapper.go

@@ -10,8 +10,8 @@ import (
 	gomock "github.com/golang/mock/gomock"
 	wgdevice "golang.zx2c4.com/wireguard/device"
 
-	iface "github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // MockIFaceMapper is a mock of IFaceMapper interface.
@@ -38,10 +38,10 @@ func (m *MockIFaceMapper) EXPECT() *MockIFaceMapperMockRecorder {
 }
 
 // Address mocks base method.
-func (m *MockIFaceMapper) Address() iface.WGAddress {
+func (m *MockIFaceMapper) Address() wgaddr.Address {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Address")
-	ret0, _ := ret[0].(iface.WGAddress)
+	ret0, _ := ret[0].(wgaddr.Address)
 	return ret0
 }
 

client/internal/connect.go

@@ -61,7 +61,7 @@ func NewConnectClient(
 }
 
 // Run with main logic.
-func (c *ConnectClient) Run(runningChan chan error) error {
+func (c *ConnectClient) Run(runningChan chan struct{}) error {
 	return c.run(MobileDependency{}, runningChan)
 }
 
@@ -102,7 +102,7 @@ func (c *ConnectClient) RunOniOS(
 	return c.run(mobileDependency, nil)
 }
 
-func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan error) error {
+func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan struct{}) error {
 	defer func() {
 		if r := recover(); r != nil {
 			rec := c.statusRecorder
@@ -159,10 +159,9 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 	}
 
 	defer c.statusRecorder.ClientStop()
-	runningChanOpen := true
 	operation := func() error {
 		// if context cancelled we not start new backoff cycle
-		if c.isContextCancelled() {
+		if c.ctx.Err() != nil {
 			return nil
 		}
 
@@ -282,10 +281,11 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 		log.Infof("Netbird engine started, the IP is: %s", peerConfig.GetAddress())
 		state.Set(StatusConnected)
 
-		if runningChan != nil && runningChanOpen {
+		if runningChan != nil {
-			runningChan <- nil
+			select {
-			close(runningChan)
+			case runningChan <- struct{}{}:
-			runningChanOpen = false
+			default:
+			}
 		}
 
 		<-engineCtx.Done()
@@ -379,15 +379,6 @@ func (c *ConnectClient) Stop() error {
 	return nil
 }
 
-func (c *ConnectClient) isContextCancelled() bool {
-	select {
-	case <-c.ctx.Done():
-		return true
-	default:
-		return false
-	}
-}
-
 // SetNetworkMapPersistence enables or disables network map persistence.
 // When enabled, the last received network map will be stored and can be retrieved
 // through the Engine's getLatestNetworkMap method. When disabled, any stored

client/internal/dns/server_test.go

@@ -22,6 +22,8 @@ import (
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
 	pfmock "github.com/netbirdio/netbird/client/iface/mocks"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
+	"github.com/netbirdio/netbird/client/internal/netflow"
 	"github.com/netbirdio/netbird/client/internal/peer"
 	"github.com/netbirdio/netbird/client/internal/statemanager"
 	"github.com/netbirdio/netbird/client/internal/stdnet"
@@ -29,6 +31,8 @@ import (
 	"github.com/netbirdio/netbird/formatter"
 )
 
+var flowLogger = netflow.NewManager(context.Background(), nil, []byte{}, nil).GetLogger()
+
 type mocWGIface struct {
 	filter device.PacketFilter
 }
@@ -37,9 +41,9 @@ func (w *mocWGIface) Name() string {
 	panic("implement me")
 }
 
-func (w *mocWGIface) Address() iface.WGAddress {
+func (w *mocWGIface) Address() wgaddr.Address {
 	ip, network, _ := net.ParseCIDR("100.66.100.0/24")
-	return iface.WGAddress{
+	return wgaddr.Address{
 		IP:      ip,
 		Network: network,
 	}
@@ -455,7 +459,7 @@ func TestDNSFakeResolverHandleUpdates(t *testing.T) {
 	}
 
 	packetfilter := pfmock.NewMockPacketFilter(ctrl)
-	packetfilter.EXPECT().DropOutgoing(gomock.Any()).AnyTimes()
+	packetfilter.EXPECT().DropOutgoing(gomock.Any(), gomock.Any()).AnyTimes()
 	packetfilter.EXPECT().AddUDPPacketHook(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any())
 	packetfilter.EXPECT().RemovePacketHook(gomock.Any())
 	packetfilter.EXPECT().SetNetwork(ipNet)
@@ -916,7 +920,7 @@ func createWgInterfaceWithBind(t *testing.T) (*iface.WGIface, error) {
 		return nil, err
 	}
 
-	pf, err := uspfilter.Create(wgIface, false)
+	pf, err := uspfilter.Create(wgIface, false, flowLogger)
 	if err != nil {
 		t.Fatalf("failed to create uspfilter: %v", err)
 		return nil, err

client/internal/dns/service_memory.go

@@ -2,7 +2,7 @@ package dns
 
 import (
 	"fmt"
-	"net"
+	"net/netip"
 	"sync"
 
 	"github.com/google/gopacket"
@@ -117,5 +117,10 @@ func (s *ServiceViaMemory) filterDNSTraffic() (string, error) {
 		return true
 	}
 
-	return filter.AddUDPPacketHook(false, net.ParseIP(s.runtimeIP), uint16(s.runtimePort), hook), nil
+	ip, err := netip.ParseAddr(s.runtimeIP)
+	if err != nil {
+		return "", fmt.Errorf("parse runtime ip: %w", err)
+	}
+
+	return filter.AddUDPPacketHook(false, ip, uint16(s.runtimePort), hook), nil
 }

client/internal/dns/wgiface.go

@@ -5,15 +5,15 @@ package dns
 import (
 	"net"
 
-	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // WGIface defines subset methods of interface required for manager
 type WGIface interface {
 	Name() string
-	Address() iface.WGAddress
+	Address() wgaddr.Address
 	ToInterface() *net.Interface
 	IsUserspaceBind() bool
 	GetFilter() device.PacketFilter

client/internal/dns/wgiface_windows.go

@@ -1,15 +1,15 @@
 package dns
 
 import (
-	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
 // WGIface defines subset methods of interface required for manager
 type WGIface interface {
 	Name() string
-	Address() iface.WGAddress
+	Address() wgaddr.Address
 	IsUserspaceBind() bool
 	GetFilter() device.PacketFilter
 	GetDevice() *device.FilteredDevice

client/internal/dnsfwd/manager.go

@@ -88,7 +88,7 @@ func (h *Manager) allowDNSFirewall() error {
 		return nil
 	}
 
-	dnsRules, err := h.firewall.AddPeerFiltering(net.IP{0, 0, 0, 0}, firewall.ProtocolUDP, nil, dport, firewall.ActionAccept, "", "")
+	dnsRules, err := h.firewall.AddPeerFiltering(nil, net.IP{0, 0, 0, 0}, firewall.ProtocolUDP, nil, dport, firewall.ActionAccept, "")
 	if err != nil {
 		log.Errorf("failed to add allow DNS router rules, err: %v", err)
 		return err

client/internal/engine.go

@@ -25,7 +25,7 @@ import (
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
 	"github.com/netbirdio/netbird/client/firewall"
-	"github.com/netbirdio/netbird/client/firewall/manager"
+	firewallManager "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/device"
@@ -33,6 +33,9 @@ import (
 	"github.com/netbirdio/netbird/client/internal/acl"
 	"github.com/netbirdio/netbird/client/internal/dns"
 	"github.com/netbirdio/netbird/client/internal/dnsfwd"
+	"github.com/netbirdio/netbird/client/internal/ingressgw"
+	"github.com/netbirdio/netbird/client/internal/netflow"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
 	"github.com/netbirdio/netbird/client/internal/networkmonitor"
 	"github.com/netbirdio/netbird/client/internal/peer"
 	"github.com/netbirdio/netbird/client/internal/peer/guard"
@@ -169,10 +172,11 @@ type Engine struct {
 
 	statusRecorder *peer.Status
 
-	firewall      manager.Manager
+	firewall          firewallManager.Manager
 	routeManager      routemanager.Manager
 	acl               acl.Manager
 	dnsForwardMgr     *dnsfwd.Manager
+	ingressGatewayMgr *ingressgw.Manager
 
 	dnsServer dns.Server
 
@@ -187,6 +191,7 @@ type Engine struct {
 	persistNetworkMap bool
 	latestNetworkMap  *mgmProto.NetworkMap
 	connSemaphore     *semaphoregroup.SemaphoreGroup
+	flowManager       nftypes.FlowManager
 }
 
 // Peer is an instance of the Connection Peer
@@ -266,6 +271,13 @@ func (e *Engine) Stop() error {
 	// stop/restore DNS first so dbus and friends don't complain because of a missing interface
 	e.stopDNSServer()
 
+	if e.ingressGatewayMgr != nil {
+		if err := e.ingressGatewayMgr.Close(); err != nil {
+			log.Warnf("failed to cleanup forward rules: %v", err)
+		}
+		e.ingressGatewayMgr = nil
+	}
+
 	if e.routeManager != nil {
 		e.routeManager.Stop(e.stateManager)
 	}
@@ -299,6 +311,12 @@ func (e *Engine) Stop() error {
 	time.Sleep(500 * time.Millisecond)
 
 	e.close()
+
+	// stop flow manager after wg interface is gone
+	if e.flowManager != nil {
+		e.flowManager.Close()
+	}
+
 	log.Infof("stopped Netbird Engine")
 
 	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
@@ -333,6 +351,10 @@ func (e *Engine) Start() error {
 	}
 	e.wgInterface = wgIface
 
+	// start flow manager right after interface creation
+	publicKey := e.config.WgPrivateKey.PublicKey()
+	e.flowManager = netflow.NewManager(e.ctx, e.wgInterface, publicKey[:], e.statusRecorder)
+
 	if e.config.RosenpassEnabled {
 		log.Infof("rosenpass is enabled")
 		if e.config.RosenpassPermissive {
@@ -439,7 +461,7 @@ func (e *Engine) createFirewall() error {
 	}
 
 	var err error
-	e.firewall, err = firewall.NewFirewall(e.wgInterface, e.stateManager, e.config.DisableServerRoutes)
+	e.firewall, err = firewall.NewFirewall(e.wgInterface, e.stateManager, e.flowManager.GetLogger(), e.config.DisableServerRoutes)
 	if err != nil || e.firewall == nil {
 		log.Errorf("failed creating firewall manager: %s", err)
 		return nil
@@ -469,16 +491,16 @@ func (e *Engine) initFirewall() error {
 	}
 
 	rosenpassPort := e.rpManager.GetAddress().Port
-	port := manager.Port{Values: []uint16{uint16(rosenpassPort)}}
+	port := firewallManager.Port{Values: []uint16{uint16(rosenpassPort)}}
 
 	// this rule is static and will be torn down on engine down by the firewall manager
 	if _, err := e.firewall.AddPeerFiltering(
+		nil,
 		net.IP{0, 0, 0, 0},
-		manager.ProtocolUDP,
+		firewallManager.ProtocolUDP,
 		nil,
 		&port,
-		manager.ActionAccept,
+		firewallManager.ActionAccept,
-		"",
 		"",
 	); err != nil {
 		log.Errorf("failed to allow rosenpass interface traffic: %v", err)
@@ -503,12 +525,13 @@ func (e *Engine) blockLanAccess() {
 	v4 := netip.PrefixFrom(netip.IPv4Unspecified(), 0)
 	for _, network := range toBlock {
 		if _, err := e.firewall.AddRouteFiltering(
+			nil,
 			[]netip.Prefix{v4},
 			network,
-			manager.ProtocolALL,
+			firewallManager.ProtocolALL,
 			nil,
 			nil,
-			manager.ActionDrop,
+			firewallManager.ActionDrop,
 		); err != nil {
 			merr = multierror.Append(merr, fmt.Errorf("add fw rule for network %s: %w", network, err))
 		}
@@ -633,25 +656,14 @@ func (e *Engine) handleSync(update *mgmProto.SyncResponse) error {
 		stunTurn = append(stunTurn, e.TURNs...)
 		e.stunTurn.Store(stunTurn)
 
-		relayMsg := wCfg.GetRelay()
+		err = e.handleRelayUpdate(wCfg.GetRelay())
-		if relayMsg != nil {
+		if err != nil {
-			// when we receive token we expect valid address list too
+			return err
-			c := &auth.Token{
-				Payload:   relayMsg.GetTokenPayload(),
-				Signature: relayMsg.GetTokenSignature(),
-			}
-			if err := e.relayManager.UpdateToken(c); err != nil {
-				log.Errorf("failed to update relay token: %v", err)
-				return fmt.Errorf("update relay token: %w", err)
 		}
 
-			e.relayManager.UpdateServerURLs(relayMsg.Urls)
+		err = e.handleFlowUpdate(wCfg.GetFlow())
-
+		if err != nil {
-			// Just in case the agent started with an MGM server where the relay was disabled but was later enabled.
+			return fmt.Errorf("handle the flow configuration: %w", err)
-			// We can ignore all errors because the guard will manage the reconnection retries.
-			_ = e.relayManager.Serve()
-		} else {
-			e.relayManager.UpdateServerURLs(nil)
 		}
 
 		// todo update signal
@@ -682,6 +694,55 @@ func (e *Engine) handleSync(update *mgmProto.SyncResponse) error {
 	return nil
 }
 
+func (e *Engine) handleRelayUpdate(update *mgmProto.RelayConfig) error {
+	if update != nil {
+		// when we receive token we expect valid address list too
+		c := &auth.Token{
+			Payload:   update.GetTokenPayload(),
+			Signature: update.GetTokenSignature(),
+		}
+		if err := e.relayManager.UpdateToken(c); err != nil {
+			return fmt.Errorf("update relay token: %w", err)
+		}
+
+		e.relayManager.UpdateServerURLs(update.Urls)
+
+		// Just in case the agent started with an MGM server where the relay was disabled but was later enabled.
+		// We can ignore all errors because the guard will manage the reconnection retries.
+		_ = e.relayManager.Serve()
+	} else {
+		e.relayManager.UpdateServerURLs(nil)
+	}
+
+	return nil
+}
+
+func (e *Engine) handleFlowUpdate(config *mgmProto.FlowConfig) error {
+	if config == nil {
+		return nil
+	}
+
+	flowConfig, err := toFlowLoggerConfig(config)
+	if err != nil {
+		return err
+	}
+	return e.flowManager.Update(flowConfig)
+}
+
+func toFlowLoggerConfig(config *mgmProto.FlowConfig) (*nftypes.FlowConfig, error) {
+	if config.GetInterval() == nil {
+		return nil, errors.New("flow interval is nil")
+	}
+	return &nftypes.FlowConfig{
+		Enabled:        config.GetEnabled(),
+		Counters:       config.GetCounters(),
+		URL:            config.GetUrl(),
+		TokenPayload:   config.GetTokenPayload(),
+		TokenSignature: config.GetTokenSignature(),
+		Interval:       config.GetInterval().AsDuration(),
+	}, nil
+}
+
 // updateChecksIfNew updates checks if there are changes and sync new meta with management
 func (e *Engine) updateChecksIfNew(checks []*mgmProto.Checks) error {
 	// if checks are equal, we skip the update
@@ -912,6 +973,11 @@ func (e *Engine) updateNetworkMap(networkMap *mgmProto.NetworkMap) error {
 		log.Errorf("failed to update clientRoutes, err: %v", err)
 	}
 
+	// Ingress forward rules
+	if err := e.updateForwardRules(networkMap.GetForwardingRules()); err != nil {
+		log.Errorf("failed to update forward rules, err: %v", err)
+	}
+
 	log.Debugf("got peers update from Management Service, total peers to connect to = %d", len(networkMap.GetRemotePeers()))
 
 	e.updateOfflinePeers(networkMap.GetOfflinePeers())
@@ -1482,7 +1548,7 @@ func (e *Engine) GetRouteManager() routemanager.Manager {
 }
 
 // GetFirewallManager returns the firewall manager
-func (e *Engine) GetFirewallManager() manager.Manager {
+func (e *Engine) GetFirewallManager() firewallManager.Manager {
 	return e.firewall
 }
 
@@ -1575,16 +1641,19 @@ func (e *Engine) probeTURNs() []relay.ProbeResult {
 	return relay.ProbeAll(e.ctx, relay.ProbeTURN, turns)
 }
 
+// restartEngine restarts the engine by cancelling the client context
 func (e *Engine) restartEngine() {
-	log.Info("restarting engine")
+	e.syncMsgMux.Lock()
-	CtxGetState(e.ctx).Set(StatusConnecting)
+	defer e.syncMsgMux.Unlock()
 
-	if err := e.Stop(); err != nil {
+	if e.ctx.Err() != nil {
-		log.Errorf("Failed to stop engine: %v", err)
+		return
 	}
 
+	log.Info("restarting engine")
+	CtxGetState(e.ctx).Set(StatusConnecting)
 	_ = CtxGetState(e.ctx).Wrap(ErrResetConnection)
-	log.Infof("cancelling client, engine will be recreated")
+	log.Infof("cancelling client context, engine will be recreated")
 	e.clientCancel()
 }
 
@@ -1596,34 +1665,17 @@ func (e *Engine) startNetworkMonitor() {
 
 	e.networkMonitor = networkmonitor.New()
 	go func() {
-		var mu sync.Mutex
+		if err := e.networkMonitor.Listen(e.ctx); err != nil {
-		var debounceTimer *time.Timer
+			if errors.Is(err, context.Canceled) {
-
+				log.Infof("network monitor stopped")
-		// Start the network monitor with a callback, Start will block until the monitor is stopped,
+				return
-		// a network change is detected, or an error occurs on start up
+			}
-		err := e.networkMonitor.Start(e.ctx, func() {
+			log.Errorf("network monitor error: %v", err)
-			// This function is called when a network change is detected
+			return
-			mu.Lock()
-			defer mu.Unlock()
-
-			if debounceTimer != nil {
-				log.Infof("Network monitor: detected network change, reset debounceTimer")
-				debounceTimer.Stop()
 		}
-
-			// Set a new timer to debounce rapid network changes
-			debounceTimer = time.AfterFunc(2*time.Second, func() {
-				// This function is called after the debounce period
-				mu.Lock()
-				defer mu.Unlock()
 
 		log.Infof("Network monitor: detected network change, restarting engine")
 		e.restartEngine()
-			})
-		})
-		if err != nil && !errors.Is(err, networkmonitor.ErrStopped) {
-			log.Errorf("Network monitor: %v", err)
-		}
 	}()
 }
 
@@ -1770,6 +1822,74 @@ func (e *Engine) Address() (netip.Addr, error) {
 	return ip.Unmap(), nil
 }
 
+func (e *Engine) updateForwardRules(rules []*mgmProto.ForwardingRule) error {
+	if e.firewall == nil {
+		log.Warn("firewall is disabled, not updating forwarding rules")
+		return nil
+	}
+
+	if len(rules) == 0 {
+		if e.ingressGatewayMgr == nil {
+			return nil
+		}
+
+		err := e.ingressGatewayMgr.Close()
+		e.ingressGatewayMgr = nil
+		e.statusRecorder.SetIngressGwMgr(nil)
+		return err
+	}
+
+	if e.ingressGatewayMgr == nil {
+		mgr := ingressgw.NewManager(e.firewall)
+		e.ingressGatewayMgr = mgr
+		e.statusRecorder.SetIngressGwMgr(mgr)
+	}
+
+	var merr *multierror.Error
+	forwardingRules := make([]firewallManager.ForwardRule, 0, len(rules))
+	for _, rule := range rules {
+		proto, err := convertToFirewallProtocol(rule.GetProtocol())
+		if err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("failed to convert protocol '%s': %w", rule.GetProtocol(), err))
+			continue
+		}
+
+		dstPortInfo, err := convertPortInfo(rule.GetDestinationPort())
+		if err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("invalid destination port '%v': %w", rule.GetDestinationPort(), err))
+			continue
+		}
+
+		translateIP, err := convertToIP(rule.GetTranslatedAddress())
+		if err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("failed to convert translated address '%s': %w", rule.GetTranslatedAddress(), err))
+			continue
+		}
+
+		translatePort, err := convertPortInfo(rule.GetTranslatedPort())
+		if err != nil {
+			merr = multierror.Append(merr, fmt.Errorf("invalid translate port '%v': %w", rule.GetTranslatedPort(), err))
+			continue
+		}
+
+		forwardRule := firewallManager.ForwardRule{
+			Protocol:          proto,
+			DestinationPort:   *dstPortInfo,
+			TranslatedAddress: translateIP,
+			TranslatedPort:    *translatePort,
+		}
+
+		forwardingRules = append(forwardingRules, forwardRule)
+	}
+
+	log.Infof("updating forwarding rules: %d", len(forwardingRules))
+	if err := e.ingressGatewayMgr.Update(forwardingRules); err != nil {
+		log.Errorf("failed to update forwarding rules: %v", err)
+	}
+
+	return nberrors.FormatErrorOrNil(merr)
+}
+
 // isChecksEqual checks if two slices of checks are equal.
 func isChecksEqual(checks []*mgmProto.Checks, oChecks []*mgmProto.Checks) bool {
 	for _, check := range checks {

client/internal/engine_test.go

@@ -31,6 +31,7 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 	"github.com/netbirdio/netbird/client/internal/dns"
 	"github.com/netbirdio/netbird/client/internal/peer"
@@ -44,6 +45,7 @@ import (
 	mgmtProto "github.com/netbirdio/netbird/management/proto"
 	"github.com/netbirdio/netbird/management/server"
 	"github.com/netbirdio/netbird/management/server/activity"
+	"github.com/netbirdio/netbird/management/server/integrations/port_forwarding"
 	"github.com/netbirdio/netbird/management/server/settings"
 	"github.com/netbirdio/netbird/management/server/store"
 	"github.com/netbirdio/netbird/management/server/telemetry"
@@ -74,7 +76,7 @@ type MockWGIface struct {
 	CreateOnAndroidFunc        func(routeRange []string, ip string, domains []string) error
 	IsUserspaceBindFunc        func() bool
 	NameFunc                   func() string
-	AddressFunc                func() device.WGAddress
+	AddressFunc                func() wgaddr.Address
 	ToInterfaceFunc            func() *net.Interface
 	UpFunc                     func() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddrFunc             func(newAddr string) error
@@ -113,7 +115,7 @@ func (m *MockWGIface) Name() string {
 	return m.NameFunc()
 }
 
-func (m *MockWGIface) Address() device.WGAddress {
+func (m *MockWGIface) Address() wgaddr.Address {
 	return m.AddressFunc()
 }
 
@@ -363,8 +365,8 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 		RemovePeerFunc: func(peerKey string) error {
 			return nil
 		},
-		AddressFunc: func() iface.WGAddress {
+		AddressFunc: func() wgaddr.Address {
-			return iface.WGAddress{
+			return wgaddr.Address{
 				IP: net.ParseIP("10.20.0.1"),
 				Network: &net.IPNet{
 					IP:   net.ParseIP("10.20.0.0"),
@@ -1433,13 +1435,13 @@ func startManagement(t *testing.T, dataDir, testFile string) (*grpc.Server, stri
 	metrics, err := telemetry.NewDefaultAppMetrics(context.Background())
 	require.NoError(t, err)
 
-	accountManager, err := server.BuildManager(context.Background(), store, peersUpdateManager, nil, "", "netbird.selfhosted", eventStore, nil, false, ia, metrics)
+	accountManager, err := server.BuildManager(context.Background(), store, peersUpdateManager, nil, "", "netbird.selfhosted", eventStore, nil, false, ia, metrics, port_forwarding.NewControllerMock(), settings.NewManagerMock())
 	if err != nil {
 		return nil, "", err
 	}
 
 	secretsManager := server.NewTimeBasedAuthSecretsManager(peersUpdateManager, config.TURNConfig, config.Relay)
-	mgmtServer, err := server.NewServer(context.Background(), config, accountManager, settings.NewManager(store), peersUpdateManager, secretsManager, nil, nil, nil)
+	mgmtServer, err := server.NewServer(context.Background(), config, accountManager, settings.NewManagerMock(), peersUpdateManager, secretsManager, nil, nil, nil)
 	if err != nil {
 		return nil, "", err
 	}

client/internal/iface_common.go

@@ -12,6 +12,7 @@ import (
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/device"
+	"github.com/netbirdio/netbird/client/iface/wgaddr"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
 )
 
@@ -20,7 +21,7 @@ type wgIfaceBase interface {
 	CreateOnAndroid(routeRange []string, ip string, domains []string) error
 	IsUserspaceBind() bool
 	Name() string
-	Address() device.WGAddress
+	Address() wgaddr.Address
 	ToInterface() *net.Interface
 	Up() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddr(newAddr string) error

client/internal/ingressgw/manager.go

@@ -0,0 +1,107 @@
+package ingressgw
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/hashicorp/go-multierror"
+	log "github.com/sirupsen/logrus"
+
+	nberrors "github.com/netbirdio/netbird/client/errors"
+	firewall "github.com/netbirdio/netbird/client/firewall/manager"
+)
+
+type DNATFirewall interface {
+	AddDNATRule(fwdRule firewall.ForwardRule) (firewall.Rule, error)
+	DeleteDNATRule(rule firewall.Rule) error
+}
+
+type RulePair struct {
+	firewall.ForwardRule
+	firewall.Rule
+}
+
+type Manager struct {
+	dnatFirewall DNATFirewall
+
+	rules   map[string]RulePair // keys is the ID of the ForwardRule
+	rulesMu sync.Mutex
+}
+
+func NewManager(dnatFirewall DNATFirewall) *Manager {
+	return &Manager{
+		dnatFirewall: dnatFirewall,
+		rules:        make(map[string]RulePair),
+	}
+}
+
+func (h *Manager) Update(forwardRules []firewall.ForwardRule) error {
+	h.rulesMu.Lock()
+	defer h.rulesMu.Unlock()
+
+	var mErr *multierror.Error
+
+	toDelete := make(map[string]RulePair, len(h.rules))
+	for id, r := range h.rules {
+		toDelete[id] = r
+	}
+
+	// Process new/updated rules
+	for _, fwdRule := range forwardRules {
+		id := fwdRule.ID()
+		if _, ok := h.rules[id]; ok {
+			delete(toDelete, id)
+			continue
+		}
+
+		rule, err := h.dnatFirewall.AddDNATRule(fwdRule)
+		if err != nil {
+			mErr = multierror.Append(mErr, fmt.Errorf("add forward rule '%s': %v", fwdRule.String(), err))
+			continue
+		}
+		log.Infof("forward rule has been added '%s'", fwdRule)
+		h.rules[id] = RulePair{
+			ForwardRule: fwdRule,
+			Rule:        rule,
+		}
+	}
+
+	// Remove deleted rules
+	for id, rulePair := range toDelete {
+		if err := h.dnatFirewall.DeleteDNATRule(rulePair.Rule); err != nil {
+			mErr = multierror.Append(mErr, fmt.Errorf("failed to delete forward rule '%s': %v", rulePair.ForwardRule.String(), err))
+		}
+		log.Infof("forward rule has been deleted '%s'", rulePair.ForwardRule)
+		delete(h.rules, id)
+	}
+
+	return nberrors.FormatErrorOrNil(mErr)
+}
+
+func (h *Manager) Close() error {
+	h.rulesMu.Lock()
+	defer h.rulesMu.Unlock()
+
+	log.Infof("clean up all (%d) forward rules", len(h.rules))
+	var mErr *multierror.Error
+	for _, rule := range h.rules {
+		if err := h.dnatFirewall.DeleteDNATRule(rule.Rule); err != nil {
+			mErr = multierror.Append(mErr, fmt.Errorf("failed to delete forward rule '%s': %v", rule, err))
+		}
+	}
+
+	h.rules = make(map[string]RulePair)
+	return nberrors.FormatErrorOrNil(mErr)
+}
+
+func (h *Manager) Rules() []firewall.ForwardRule {
+	h.rulesMu.Lock()
+	defer h.rulesMu.Unlock()
+
+	rules := make([]firewall.ForwardRule, 0, len(h.rules))
+	for _, rulePair := range h.rules {
+		rules = append(rules, rulePair.ForwardRule)
+	}
+
+	return rules
+}

client/internal/ingressgw/manager_test.go

@@ -0,0 +1,281 @@
+package ingressgw
+
+import (
+	"fmt"
+	"net/netip"
+	"testing"
+
+	firewall "github.com/netbirdio/netbird/client/firewall/manager"
+)
+
+var (
+	_ firewall.Rule = (*MocFwRule)(nil)
+	_ DNATFirewall  = &MockDNATFirewall{}
+)
+
+type MocFwRule struct {
+	id string
+}
+
+func (m *MocFwRule) ID() string {
+	return string(m.id)
+}
+
+type MockDNATFirewall struct {
+	throwError bool
+}
+
+func (m *MockDNATFirewall) AddDNATRule(fwdRule firewall.ForwardRule) (firewall.Rule, error) {
+	if m.throwError {
+		return nil, fmt.Errorf("moc error")
+	}
+
+	fwRule := &MocFwRule{
+		id: fwdRule.ID(),
+	}
+	return fwRule, nil
+}
+
+func (m *MockDNATFirewall) DeleteDNATRule(rule firewall.Rule) error {
+	if m.throwError {
+		return fmt.Errorf("moc error")
+	}
+	return nil
+}
+
+func (m *MockDNATFirewall) forceToThrowErrors() {
+	m.throwError = true
+}
+
+func TestManager_AddRule(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+
+	updates := []firewall.ForwardRule{
+		{
+			Protocol:          firewall.ProtocolTCP,
+			DestinationPort:   *port,
+			TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+			TranslatedPort:    *port,
+		},
+		{
+			Protocol:          firewall.ProtocolUDP,
+			DestinationPort:   *port,
+			TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+			TranslatedPort:    *port,
+		}}
+
+	if err := mgr.Update(updates); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != len(updates) {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+}
+
+func TestManager_UpdateRule(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	ruleUDP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolUDP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.2"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleUDP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 1 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+
+	if rules[0].TranslatedAddress.String() != ruleUDP.TranslatedAddress.String() {
+		t.Errorf("unexpected rule: %v", rules[0])
+	}
+
+	if rules[0].TranslatedPort.String() != ruleUDP.TranslatedPort.String() {
+		t.Errorf("unexpected rule: %v", rules[0])
+	}
+
+	if rules[0].DestinationPort.String() != ruleUDP.DestinationPort.String() {
+		t.Errorf("unexpected rule: %v", rules[0])
+	}
+
+	if rules[0].Protocol != ruleUDP.Protocol {
+		t.Errorf("unexpected rule: %v", rules[0])
+	}
+}
+
+func TestManager_ExtendRules(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	ruleUDP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolUDP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.2"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP, ruleUDP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 2 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+}
+
+func TestManager_UnderlingError(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	ruleUDP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolUDP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.2"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	fw.forceToThrowErrors()
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP, ruleUDP}); err == nil {
+		t.Errorf("expected error")
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 1 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+}
+
+func TestManager_Cleanup(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 0 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+}
+
+func TestManager_DeleteBrokenRule(t *testing.T) {
+	fw := &MockDNATFirewall{}
+
+	// force to throw errors when Add DNAT Rule
+	fw.forceToThrowErrors()
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err == nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 0 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+
+	// simulate that to remove a broken rule
+	if err := mgr.Update([]firewall.ForwardRule{}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if err := mgr.Close(); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
+func TestManager_Close(t *testing.T) {
+	fw := &MockDNATFirewall{}
+	mgr := NewManager(fw)
+
+	port, _ := firewall.NewPort(8080)
+	ruleTCP := firewall.ForwardRule{
+		Protocol:          firewall.ProtocolTCP,
+		DestinationPort:   *port,
+		TranslatedAddress: netip.MustParseAddr("172.16.254.1"),
+		TranslatedPort:    *port,
+	}
+
+	if err := mgr.Update([]firewall.ForwardRule{ruleTCP}); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if err := mgr.Close(); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	rules := mgr.Rules()
+	if len(rules) != 0 {
+		t.Errorf("unexpected rules count: %d", len(rules))
+	}
+}

client/internal/message_convert.go

@@ -0,0 +1,58 @@
+package internal
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/netip"
+
+	firewallManager "github.com/netbirdio/netbird/client/firewall/manager"
+	mgmProto "github.com/netbirdio/netbird/management/proto"
+)
+
+func convertToFirewallProtocol(protocol mgmProto.RuleProtocol) (firewallManager.Protocol, error) {
+	switch protocol {
+	case mgmProto.RuleProtocol_TCP:
+		return firewallManager.ProtocolTCP, nil
+	case mgmProto.RuleProtocol_UDP:
+		return firewallManager.ProtocolUDP, nil
+	case mgmProto.RuleProtocol_ICMP:
+		return firewallManager.ProtocolICMP, nil
+	case mgmProto.RuleProtocol_ALL:
+		return firewallManager.ProtocolALL, nil
+	default:
+		return "", fmt.Errorf("invalid protocol type: %s", protocol.String())
+	}
+}
+
+func convertPortInfo(portInfo *mgmProto.PortInfo) (*firewallManager.Port, error) {
+	if portInfo == nil {
+		return nil, errors.New("portInfo cannot be nil")
+	}
+
+	if portInfo.GetPort() != 0 {
+		return firewallManager.NewPort(int(portInfo.GetPort()))
+	}
+
+	if portInfo.GetRange() != nil {
+		return firewallManager.NewPort(int(portInfo.GetRange().Start), int(portInfo.GetRange().End))
+	}
+
+	return nil, fmt.Errorf("invalid portInfo: %v", portInfo)
+}
+
+func convertToIP(rawIP []byte) (netip.Addr, error) {
+	if rawIP == nil {
+		return netip.Addr{}, errors.New("input bytes cannot be nil")
+	}
+
+	if len(rawIP) != net.IPv4len && len(rawIP) != net.IPv6len {
+		return netip.Addr{}, fmt.Errorf("invalid IP length: %d", len(rawIP))
+	}
+
+	if len(rawIP) == net.IPv4len {
+		return netip.AddrFrom4([4]byte(rawIP)), nil
+	}
+
+	return netip.AddrFrom16([16]byte(rawIP)), nil
+}

client/internal/netflow/conntrack/conntrack.go

@@ -0,0 +1,306 @@
+//go:build linux && !android
+
+package conntrack
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net/netip"
+	"sync"
+
+	"github.com/google/uuid"
+	log "github.com/sirupsen/logrus"
+	nfct "github.com/ti-mo/conntrack"
+	"github.com/ti-mo/netfilter"
+
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
+)
+
+const defaultChannelSize = 100
+
+// ConnTrack manages kernel-based conntrack events
+type ConnTrack struct {
+	flowLogger nftypes.FlowLogger
+	iface      nftypes.IFaceMapper
+
+	conn *nfct.Conn
+	mux  sync.Mutex
+
+	instanceID     uuid.UUID
+	started        bool
+	done           chan struct{}
+	sysctlModified bool
+}
+
+// New creates a new connection tracker that interfaces with the kernel's conntrack system
+func New(flowLogger nftypes.FlowLogger, iface nftypes.IFaceMapper) *ConnTrack {
+	return &ConnTrack{
+		flowLogger: flowLogger,
+		iface:      iface,
+		instanceID: uuid.New(),
+		started:    false,
+		done:       make(chan struct{}, 1),
+	}
+}
+
+// Start begins tracking connections by listening for conntrack events. This method is idempotent.
+func (c *ConnTrack) Start(enableCounters bool) error {
+	c.mux.Lock()
+	defer c.mux.Unlock()
+
+	if c.started {
+		return nil
+	}
+
+	log.Info("Starting conntrack event listening")
+
+	if enableCounters {
+		c.EnableAccounting()
+	}
+
+	conn, err := nfct.Dial(nil)
+	if err != nil {
+		return fmt.Errorf("dial conntrack: %w", err)
+	}
+	c.conn = conn
+
+	events := make(chan nfct.Event, defaultChannelSize)
+	errChan, err := conn.Listen(events, 1, []netfilter.NetlinkGroup{
+		netfilter.GroupCTNew,
+		netfilter.GroupCTDestroy,
+	})
+
+	if err != nil {
+		if err := c.conn.Close(); err != nil {
+			log.Errorf("Error closing conntrack connection: %v", err)
+		}
+		c.conn = nil
+		return fmt.Errorf("start conntrack listener: %w", err)
+	}
+
+	c.started = true
+
+	go c.receiverRoutine(events, errChan)
+
+	return nil
+}
+
+func (c *ConnTrack) receiverRoutine(events chan nfct.Event, errChan chan error) {
+	for {
+		select {
+		case event := <-events:
+			c.handleEvent(event)
+		case err := <-errChan:
+			log.Errorf("Error from conntrack event listener: %v", err)
+			if err := c.conn.Close(); err != nil {
+				log.Errorf("Error closing conntrack connection: %v", err)
+			}
+			return
+		case <-c.done:
+			return
+		}
+	}
+}
+
+// Stop stops the connection tracking. This method is idempotent.
+func (c *ConnTrack) Stop() {
+	c.mux.Lock()
+	defer c.mux.Unlock()
+
+	if !c.started {
+		return
+	}
+
+	log.Info("Stopping conntrack event listening")
+
+	select {
+	case c.done <- struct{}{}:
+	default:
+	}
+
+	if c.conn != nil {
+		if err := c.conn.Close(); err != nil {
+			log.Errorf("Error closing conntrack connection: %v", err)
+		}
+		c.conn = nil
+	}
+
+	c.started = false
+
+	c.RestoreAccounting()
+}
+
+// Close stops listening for events and cleans up resources
+func (c *ConnTrack) Close() error {
+	c.mux.Lock()
+	defer c.mux.Unlock()
+
+	if c.started {
+		select {
+		case c.done <- struct{}{}:
+		default:
+		}
+	}
+
+	if c.conn != nil {
+		err := c.conn.Close()
+		c.conn = nil
+		c.started = false
+
+		c.RestoreAccounting()
+
+		if err != nil {
+			return fmt.Errorf("close conntrack: %w", err)
+		}
+	}
+
+	return nil
+}
+
+// handleEvent processes incoming conntrack events
+func (c *ConnTrack) handleEvent(event nfct.Event) {
+	if event.Flow == nil {
+		return
+	}
+
+	if event.Type != nfct.EventNew && event.Type != nfct.EventDestroy {
+		return
+	}
+
+	flow := *event.Flow
+
+	proto := nftypes.Protocol(flow.TupleOrig.Proto.Protocol)
+	if proto == nftypes.ProtocolUnknown {
+		return
+	}
+	srcIP := flow.TupleOrig.IP.SourceAddress
+	dstIP := flow.TupleOrig.IP.DestinationAddress
+
+	if !c.relevantFlow(srcIP, dstIP) {
+		return
+	}
+
+	var srcPort, dstPort uint16
+	var icmpType, icmpCode uint8
+
+	switch proto {
+	case nftypes.TCP, nftypes.UDP, nftypes.SCTP:
+		srcPort = flow.TupleOrig.Proto.SourcePort
+		dstPort = flow.TupleOrig.Proto.DestinationPort
+	case nftypes.ICMP:
+		icmpType = flow.TupleOrig.Proto.ICMPType
+		icmpCode = flow.TupleOrig.Proto.ICMPCode
+	}
+
+	flowID := c.getFlowID(flow.ID)
+	direction := c.inferDirection(srcIP, dstIP)
+
+	eventType := nftypes.TypeStart
+	eventStr := "New"
+
+	if event.Type == nfct.EventDestroy {
+		eventType = nftypes.TypeEnd
+		eventStr = "Ended"
+	}
+
+	log.Tracef("%s %s %s connection: %s:%d -> %s:%d", eventStr, direction, proto, srcIP, srcPort, dstIP, dstPort)
+
+	c.flowLogger.StoreEvent(nftypes.EventFields{
+		FlowID:     flowID,
+		Type:       eventType,
+		Direction:  direction,
+		Protocol:   proto,
+		SourceIP:   srcIP,
+		DestIP:     dstIP,
+		SourcePort: srcPort,
+		DestPort:   dstPort,
+		ICMPType:   icmpType,
+		ICMPCode:   icmpCode,
+		RxPackets:  c.mapRxPackets(flow, direction),
+		TxPackets:  c.mapTxPackets(flow, direction),
+		RxBytes:    c.mapRxBytes(flow, direction),
+		TxBytes:    c.mapTxBytes(flow, direction),
+	})
+}
+
+// relevantFlow checks if the flow is related to the specified interface
+func (c *ConnTrack) relevantFlow(srcIP, dstIP netip.Addr) bool {
+	// TODO: filter traffic by interface
+
+	wgnet := c.iface.Address().Network
+	if !wgnet.Contains(srcIP.AsSlice()) && !wgnet.Contains(dstIP.AsSlice()) {
+		return false
+	}
+
+	return true
+}
+
+// mapRxPackets maps packet counts to RX based on flow direction
+func (c *ConnTrack) mapRxPackets(flow nfct.Flow, direction nftypes.Direction) uint64 {
+	// For Ingress: CountersOrig is from external to us (RX)
+	// For Egress: CountersReply is from external to us (RX)
+	if direction == nftypes.Ingress {
+		return flow.CountersOrig.Packets
+	}
+	return flow.CountersReply.Packets
+}
+
+// mapTxPackets maps packet counts to TX based on flow direction
+func (c *ConnTrack) mapTxPackets(flow nfct.Flow, direction nftypes.Direction) uint64 {
+	// For Ingress: CountersReply is from us to external (TX)
+	// For Egress: CountersOrig is from us to external (TX)
+	if direction == nftypes.Ingress {
+		return flow.CountersReply.Packets
+	}
+	return flow.CountersOrig.Packets
+}
+
+// mapRxBytes maps byte counts to RX based on flow direction
+func (c *ConnTrack) mapRxBytes(flow nfct.Flow, direction nftypes.Direction) uint64 {
+	// For Ingress: CountersOrig is from external to us (RX)
+	// For Egress: CountersReply is from external to us (RX)
+	if direction == nftypes.Ingress {
+		return flow.CountersOrig.Bytes
+	}
+	return flow.CountersReply.Bytes
+}
+
+// mapTxBytes maps byte counts to TX based on flow direction
+func (c *ConnTrack) mapTxBytes(flow nfct.Flow, direction nftypes.Direction) uint64 {
+	// For Ingress: CountersReply is from us to external (TX)
+	// For Egress: CountersOrig is from us to external (TX)
+	if direction == nftypes.Ingress {
+		return flow.CountersReply.Bytes
+	}
+	return flow.CountersOrig.Bytes
+}
+
+// getFlowID creates a unique UUID based on the conntrack ID and instance ID
+func (c *ConnTrack) getFlowID(conntrackID uint32) uuid.UUID {
+	var buf [4]byte
+	binary.BigEndian.PutUint32(buf[:], conntrackID)
+	return uuid.NewSHA1(c.instanceID, buf[:])
+}
+
+func (c *ConnTrack) inferDirection(srcIP, dstIP netip.Addr) nftypes.Direction {
+	wgaddr := c.iface.Address().IP
+	wgnetwork := c.iface.Address().Network
+	src, dst := srcIP.AsSlice(), dstIP.AsSlice()
+
+	switch {
+	case wgaddr.Equal(src):
+		return nftypes.Egress
+	case wgaddr.Equal(dst):
+		return nftypes.Ingress
+	case wgnetwork.Contains(src):
+		// netbird network -> resource network
+		return nftypes.Ingress
+	case wgnetwork.Contains(dst):
+		// resource network -> netbird network
+		return nftypes.Egress
+
+		// TODO: handle site2site traffic
+	}
+
+	return nftypes.DirectionUnknown
+}

client/internal/netflow/conntrack/conntrack_nonlinux.go

@@ -0,0 +1,9 @@
+//go:build !linux || android
+
+package conntrack
+
+import nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
+
+func New(flowLogger nftypes.FlowLogger, iface nftypes.IFaceMapper) nftypes.ConnTracker {
+	return nil
+}

client/internal/netflow/conntrack/sysctl.go

@@ -0,0 +1,73 @@
+//go:build linux && !android
+
+package conntrack
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	// conntrackAcctPath is the sysctl path for conntrack accounting
+	conntrackAcctPath = "net.netfilter.nf_conntrack_acct"
+)
+
+// EnableAccounting ensures that connection tracking accounting is enabled  in the kernel.
+func (c *ConnTrack) EnableAccounting() {
+	// haven't restored yet
+	if c.sysctlModified {
+		return
+	}
+
+	modified, err := setSysctl(conntrackAcctPath, 1)
+	if err != nil {
+		log.Warnf("Failed to enable conntrack accounting: %v", err)
+		return
+	}
+	c.sysctlModified = modified
+}
+
+// RestoreAccounting restores the connection tracking accounting setting to its original value.
+func (c *ConnTrack) RestoreAccounting() {
+	if !c.sysctlModified {
+		return
+	}
+
+	if _, err := setSysctl(conntrackAcctPath, 0); err != nil {
+		log.Warnf("Failed to restore conntrack accounting: %v", err)
+		return
+	}
+
+	c.sysctlModified = false
+}
+
+// setSysctl sets a sysctl configuration and returns whether it was modified.
+func setSysctl(key string, desiredValue int) (bool, error) {
+	path := fmt.Sprintf("/proc/sys/%s", strings.ReplaceAll(key, ".", "/"))
+
+	currentValue, err := os.ReadFile(path)
+	if err != nil {
+		return false, fmt.Errorf("read sysctl %s: %w", key, err)
+	}
+
+	currentV, err := strconv.Atoi(strings.TrimSpace(string(currentValue)))
+	if err != nil && len(currentValue) > 0 {
+		return false, fmt.Errorf("convert current value to int: %w", err)
+	}
+
+	if currentV == desiredValue {
+		return false, nil
+	}
+
+	// nolint:gosec
+	if err := os.WriteFile(path, []byte(strconv.Itoa(desiredValue)), 0644); err != nil {
+		return false, fmt.Errorf("write sysctl %s: %w", key, err)
+	}
+
+	log.Debugf("Set sysctl %s from %d to %d", key, currentV, desiredValue)
+	return true, nil
+}

client/internal/netflow/logger/logger.go

@@ -0,0 +1,125 @@
+package logger
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/google/uuid"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/internal/netflow/store"
+	"github.com/netbirdio/netbird/client/internal/netflow/types"
+	"github.com/netbirdio/netbird/client/internal/peer"
+)
+
+type rcvChan chan *types.EventFields
+type Logger struct {
+	mux            sync.Mutex
+	ctx            context.Context
+	cancel         context.CancelFunc
+	enabled        atomic.Bool
+	rcvChan        atomic.Pointer[rcvChan]
+	cancelReceiver context.CancelFunc
+	statusRecorder *peer.Status
+	Store          types.Store
+}
+
+func New(ctx context.Context, statusRecorder *peer.Status) *Logger {
+	ctx, cancel := context.WithCancel(ctx)
+	return &Logger{
+		ctx:            ctx,
+		cancel:         cancel,
+		statusRecorder: statusRecorder,
+		Store:          store.NewMemoryStore(),
+	}
+}
+
+func (l *Logger) StoreEvent(flowEvent types.EventFields) {
+	if !l.enabled.Load() {
+		return
+	}
+
+	c := l.rcvChan.Load()
+	if c == nil {
+		return
+	}
+
+	select {
+	case *c <- &flowEvent:
+	default:
+		// todo: we should collect or log on this
+	}
+}
+
+func (l *Logger) Enable() {
+	go l.startReceiver()
+}
+
+func (l *Logger) startReceiver() {
+	if l.enabled.Load() {
+		return
+	}
+
+	l.mux.Lock()
+	ctx, cancel := context.WithCancel(l.ctx)
+	l.cancelReceiver = cancel
+	l.mux.Unlock()
+
+	c := make(rcvChan, 100)
+	l.rcvChan.Store(&c)
+	l.enabled.Store(true)
+
+	for {
+		select {
+		case <-ctx.Done():
+			log.Info("flow Memory store receiver stopped")
+			return
+		case eventFields := <-c:
+			id := uuid.New()
+			event := types.Event{
+				ID:          id,
+				EventFields: *eventFields,
+				Timestamp:   time.Now(),
+			}
+			srcResId, dstResId := l.statusRecorder.CheckRoutes(event.SourceIP, event.DestIP, event.Direction)
+			event.SourceResourceID = []byte(srcResId)
+			event.DestResourceID = []byte(dstResId)
+			l.Store.StoreEvent(&event)
+		}
+	}
+}
+
+func (l *Logger) Disable() {
+	l.stop()
+	l.Store.Close()
+}
+
+func (l *Logger) stop() {
+	if !l.enabled.Load() {
+		return
+	}
+
+	l.enabled.Store(false)
+	l.mux.Lock()
+	if l.cancelReceiver != nil {
+		l.cancelReceiver()
+		l.cancelReceiver = nil
+	}
+	l.rcvChan.Store(nil)
+	l.mux.Unlock()
+}
+
+func (l *Logger) GetEvents() []*types.Event {
+	return l.Store.GetEvents()
+}
+
+func (l *Logger) DeleteEvents(ids []uuid.UUID) {
+	l.Store.DeleteEvents(ids)
+}
+
+func (l *Logger) Close() {
+	l.stop()
+	l.cancel()
+}

client/internal/netflow/logger/logger_test.go

@@ -0,0 +1,67 @@
+package logger_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+
+	"github.com/netbirdio/netbird/client/internal/netflow/logger"
+	"github.com/netbirdio/netbird/client/internal/netflow/types"
+)
+
+func TestStore(t *testing.T) {
+	logger := logger.New(context.Background(), nil)
+	logger.Enable()
+
+	event := types.EventFields{
+		FlowID:    uuid.New(),
+		Type:      types.TypeStart,
+		Direction: types.Ingress,
+		Protocol:  6,
+	}
+
+	wait := func() { time.Sleep(time.Millisecond) }
+	wait()
+	logger.StoreEvent(event)
+	wait()
+
+	allEvents := logger.GetEvents()
+	matched := false
+	for _, e := range allEvents {
+		if e.EventFields.FlowID == event.FlowID {
+			matched = true
+		}
+	}
+	if !matched {
+		t.Errorf("didn't match any event")
+	}
+
+	// test disable
+	logger.Disable()
+	wait()
+	logger.StoreEvent(event)
+	wait()
+	allEvents = logger.GetEvents()
+	if len(allEvents) != 0 {
+		t.Errorf("expected 0 events, got %d", len(allEvents))
+	}
+
+	// test re-enable
+	logger.Enable()
+	wait()
+	logger.StoreEvent(event)
+	wait()
+
+	allEvents = logger.GetEvents()
+	matched = false
+	for _, e := range allEvents {
+		if e.EventFields.FlowID == event.FlowID {
+			matched = true
+		}
+	}
+	if !matched {
+		t.Errorf("didn't match any event")
+	}
+}

client/internal/netflow/manager.go

@@ -0,0 +1,235 @@
+package netflow
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/google/uuid"
+	log "github.com/sirupsen/logrus"
+	"google.golang.org/protobuf/types/known/timestamppb"
+
+	"github.com/netbirdio/netbird/client/internal/netflow/conntrack"
+	"github.com/netbirdio/netbird/client/internal/netflow/logger"
+	nftypes "github.com/netbirdio/netbird/client/internal/netflow/types"
+	"github.com/netbirdio/netbird/client/internal/peer"
+	"github.com/netbirdio/netbird/flow/client"
+	"github.com/netbirdio/netbird/flow/proto"
+)
+
+// Manager handles netflow tracking and logging
+type Manager struct {
+	mux            sync.Mutex
+	logger         nftypes.FlowLogger
+	flowConfig     *nftypes.FlowConfig
+	conntrack      nftypes.ConnTracker
+	ctx            context.Context
+	receiverClient *client.GRPCClient
+	publicKey      []byte
+}
+
+// NewManager creates a new netflow manager
+func NewManager(ctx context.Context, iface nftypes.IFaceMapper, publicKey []byte, statusRecorder *peer.Status) *Manager {
+	flowLogger := logger.New(ctx, statusRecorder)
+
+	var ct nftypes.ConnTracker
+	if runtime.GOOS == "linux" && iface != nil && !iface.IsUserspaceBind() {
+		ct = conntrack.New(flowLogger, iface)
+	}
+
+	return &Manager{
+		logger:    flowLogger,
+		conntrack: ct,
+		ctx:       ctx,
+		publicKey: publicKey,
+	}
+}
+
+// Update applies new flow configuration settings
+// needsNewClient checks if a new client needs to be created
+func (m *Manager) needsNewClient(previous *nftypes.FlowConfig) bool {
+	current := m.flowConfig
+	return previous == nil ||
+		!previous.Enabled ||
+		previous.TokenPayload != current.TokenPayload ||
+		previous.TokenSignature != current.TokenSignature ||
+		previous.URL != current.URL
+}
+
+// enableFlow starts components for flow tracking
+func (m *Manager) enableFlow(previous *nftypes.FlowConfig) error {
+	// first make sender ready so events don't pile up
+	if m.needsNewClient(previous) {
+		if m.receiverClient != nil {
+			if err := m.receiverClient.Close(); err != nil {
+				log.Warnf("error closing previous flow client: %s", err)
+			}
+		}
+
+		flowClient, err := client.NewClient(m.flowConfig.URL, m.flowConfig.TokenPayload, m.flowConfig.TokenSignature, m.flowConfig.Interval)
+		if err != nil {
+			return fmt.Errorf("create client: %w", err)
+		}
+		log.Infof("flow client configured to connect to %s", m.flowConfig.URL)
+
+		m.receiverClient = flowClient
+		go m.receiveACKs(flowClient)
+		go m.startSender()
+	}
+
+	m.logger.Enable()
+
+	if m.conntrack != nil {
+		if err := m.conntrack.Start(m.flowConfig.Counters); err != nil {
+			return fmt.Errorf("start conntrack: %w", err)
+		}
+	}
+
+	return nil
+}
+
+// disableFlow stops components for flow tracking
+func (m *Manager) disableFlow() error {
+	if m.conntrack != nil {
+		m.conntrack.Stop()
+	}
+
+	m.logger.Disable()
+
+	if m.receiverClient != nil {
+		return m.receiverClient.Close()
+	}
+	return nil
+}
+
+// Update applies new flow configuration settings
+func (m *Manager) Update(update *nftypes.FlowConfig) error {
+	if update == nil {
+		return nil
+	}
+
+	m.mux.Lock()
+	defer m.mux.Unlock()
+
+	previous := m.flowConfig
+	m.flowConfig = update
+
+	if update.Enabled {
+		return m.enableFlow(previous)
+	}
+
+	return m.disableFlow()
+}
+
+// Close cleans up all resources
+func (m *Manager) Close() {
+	m.mux.Lock()
+	defer m.mux.Unlock()
+
+	if m.conntrack != nil {
+		m.conntrack.Close()
+	}
+
+	if m.receiverClient != nil {
+		if err := m.receiverClient.Close(); err != nil {
+			log.Warnf("failed to close receiver client: %s", err)
+		}
+	}
+
+	m.logger.Close()
+}
+
+// GetLogger returns the flow logger
+func (m *Manager) GetLogger() nftypes.FlowLogger {
+	return m.logger
+}
+
+func (m *Manager) startSender() {
+	ticker := time.NewTicker(m.flowConfig.Interval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-m.ctx.Done():
+			return
+		case <-ticker.C:
+			events := m.logger.GetEvents()
+			for _, event := range events {
+				if err := m.send(event); err != nil {
+					log.Errorf("failed to send flow event to server: %s", err)
+					continue
+				}
+				log.Tracef("sent flow event: %s", event.ID)
+			}
+		}
+	}
+}
+
+func (m *Manager) receiveACKs(client *client.GRPCClient) {
+	err := client.Receive(m.ctx, m.flowConfig.Interval, func(ack *proto.FlowEventAck) error {
+		log.Tracef("received flow event ack: %s", ack.EventId)
+		m.logger.DeleteEvents([]uuid.UUID{uuid.UUID(ack.EventId)})
+		return nil
+	})
+
+	if err != nil && !errors.Is(err, context.Canceled) {
+		log.Errorf("failed to receive flow event ack: %s", err)
+	}
+}
+
+func (m *Manager) send(event *nftypes.Event) error {
+	m.mux.Lock()
+	client := m.receiverClient
+	m.mux.Unlock()
+
+	if client == nil {
+		return nil
+	}
+
+	return client.Send(toProtoEvent(m.publicKey, event))
+}
+
+func toProtoEvent(publicKey []byte, event *nftypes.Event) *proto.FlowEvent {
+	protoEvent := &proto.FlowEvent{
+		EventId:   event.ID[:],
+		Timestamp: timestamppb.New(event.Timestamp),
+		PublicKey: publicKey,
+		FlowFields: &proto.FlowFields{
+			FlowId:           event.FlowID[:],
+			RuleId:           event.RuleID,
+			Type:             proto.Type(event.Type),
+			Direction:        proto.Direction(event.Direction),
+			Protocol:         uint32(event.Protocol),
+			SourceIp:         event.SourceIP.AsSlice(),
+			DestIp:           event.DestIP.AsSlice(),
+			RxPackets:        event.RxPackets,
+			TxPackets:        event.TxPackets,
+			RxBytes:          event.RxBytes,
+			TxBytes:          event.TxBytes,
+			SourceResourceId: event.SourceResourceID,
+			DestResourceId:   event.DestResourceID,
+		},
+	}
+
+	if event.Protocol == nftypes.ICMP {
+		protoEvent.FlowFields.ConnectionInfo = &proto.FlowFields_IcmpInfo{
+			IcmpInfo: &proto.ICMPInfo{
+				IcmpType: uint32(event.ICMPType),
+				IcmpCode: uint32(event.ICMPCode),
+			},
+		}
+		return protoEvent
+	}
+
+	protoEvent.FlowFields.ConnectionInfo = &proto.FlowFields_PortInfo{
+		PortInfo: &proto.PortInfo{
+			SourcePort: uint32(event.SourcePort),
+			DestPort:   uint32(event.DestPort),
+		},
+	}
+
+	return protoEvent
+}