[management,client] Make DNS ForwarderPort Configurable & Change Well Known Port (#4479)

makes the DNS forwarder port configurable in the management and client components, while changing the well-known port from 5454 to 22054. The change includes version-aware port assignment to ensure backward compatibility.

- Adds a configurable `ForwarderPort` field to the DNS configuration protocol
- Implements version-based port computation that returns the new port (22054) only when all peers support version 0.59.0 or newer
- Updates the client to dynamically restart the DNS forwarder when the port changes

client/internal/dnsfwd/manager.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"sync"
 
 	"github.com/hashicorp/go-multierror"
 	log "github.com/sirupsen/logrus"
@@ -11,14 +12,18 @@ import (
 	nberrors "github.com/netbirdio/netbird/client/errors"
 	firewall "github.com/netbirdio/netbird/client/firewall/manager"
 	"github.com/netbirdio/netbird/client/internal/peer"
-	"github.com/netbirdio/netbird/shared/management/domain"
 	"github.com/netbirdio/netbird/route"
+	"github.com/netbirdio/netbird/shared/management/domain"
+)
+
+var (
+	// ListenPort is the port that the DNS forwarder listens on. It has been used by the client peers also
+	listenPort   uint16 = 5353
+	listenPortMu sync.RWMutex
 )
 
 const (
-	// ListenPort is the port that the DNS forwarder listens on. It has been used by the client peers also
+	dnsTTL = 60 //seconds
-	ListenPort = 5353
-	dnsTTL     = 60 //seconds
 )
 
 // ForwarderEntry is a mapping from a domain to a resource ID and a hash of the parent domain list.
@@ -35,12 +40,20 @@ type Manager struct {
 	fwRules      []firewall.Rule
 	tcpRules     []firewall.Rule
 	dnsForwarder *DNSForwarder
+	port         uint16
 }
 
-func NewManager(fw firewall.Manager, statusRecorder *peer.Status) *Manager {
+func ListenPort() uint16 {
+	listenPortMu.RLock()
+	defer listenPortMu.RUnlock()
+	return listenPort
+}
+
+func NewManager(fw firewall.Manager, statusRecorder *peer.Status, port uint16) *Manager {
 	return &Manager{
 		firewall:       fw,
 		statusRecorder: statusRecorder,
+		port:           port,
 	}
 }
 
@@ -54,7 +67,13 @@ func (m *Manager) Start(fwdEntries []*ForwarderEntry) error {
 		return err
 	}
 
-	m.dnsForwarder = NewDNSForwarder(fmt.Sprintf(":%d", ListenPort), dnsTTL, m.firewall, m.statusRecorder)
+	if m.port > 0 {
+		listenPortMu.Lock()
+		listenPort = m.port
+		listenPortMu.Unlock()
+	}
+
+	m.dnsForwarder = NewDNSForwarder(fmt.Sprintf(":%d", ListenPort()), dnsTTL, m.firewall, m.statusRecorder)
 	go func() {
 		if err := m.dnsForwarder.Listen(fwdEntries); err != nil {
 			// todo handle close error if it is exists
@@ -94,7 +113,7 @@ func (m *Manager) Stop(ctx context.Context) error {
 func (m *Manager) allowDNSFirewall() error {
 	dport := &firewall.Port{
 		IsRange: false,
-		Values:  []uint16{ListenPort},
+		Values:  []uint16{ListenPort()},
 	}
 
 	if m.firewall == nil {

client/internal/engine.go

@@ -202,6 +202,9 @@ type Engine struct {
 	// WireGuard interface monitor
 	wgIfaceMonitor   *WGIfaceMonitor
 	wgIfaceMonitorWg sync.WaitGroup
+
+	// dns forwarder port
+	dnsFwdPort uint16
 }
 
 // Peer is an instance of the Connection Peer
@@ -244,6 +247,7 @@ func NewEngine(
 		statusRecorder: statusRecorder,
 		checks:         checks,
 		connSemaphore:  semaphoregroup.NewSemaphoreGroup(connInitLimit),
+		dnsFwdPort:     dnsfwd.ListenPort(),
 	}
 
 	sm := profilemanager.NewServiceManager("")
@@ -1080,7 +1084,7 @@ func (e *Engine) updateNetworkMap(networkMap *mgmProto.NetworkMap) error {
 	}
 
 	fwdEntries := toRouteDomains(e.config.WgPrivateKey.PublicKey().String(), routes)
-	e.updateDNSForwarder(dnsRouteFeatureFlag, fwdEntries)
+	e.updateDNSForwarder(dnsRouteFeatureFlag, fwdEntries, uint16(protoDNSConfig.ForwarderPort))
 
 	// Ingress forward rules
 	forwardingRules, err := e.updateForwardRules(networkMap.GetForwardingRules())
@@ -1839,6 +1843,7 @@ func (e *Engine) GetWgAddr() netip.Addr {
 func (e *Engine) updateDNSForwarder(
 	enabled bool,
 	fwdEntries []*dnsfwd.ForwarderEntry,
+	forwarderPort uint16,
 ) {
 	if e.config.DisableServerRoutes {
 		return
@@ -1855,16 +1860,20 @@ func (e *Engine) updateDNSForwarder(
 	}
 
 	if len(fwdEntries) > 0 {
-		if e.dnsForwardMgr == nil {
+		switch {
-			e.dnsForwardMgr = dnsfwd.NewManager(e.firewall, e.statusRecorder)
+		case e.dnsForwardMgr == nil:
-
+			e.dnsForwardMgr = dnsfwd.NewManager(e.firewall, e.statusRecorder, forwarderPort)
 			if err := e.dnsForwardMgr.Start(fwdEntries); err != nil {
 				log.Errorf("failed to start DNS forward: %v", err)
 				e.dnsForwardMgr = nil
 			}
-
 			log.Infof("started domain router service with %d entries", len(fwdEntries))
-		} else {
+		case e.dnsFwdPort != forwarderPort:
+			log.Infof("updating domain router service port from %d to %d", e.dnsFwdPort, forwarderPort)
+			e.restartDnsFwd(fwdEntries, forwarderPort)
+			e.dnsFwdPort = forwarderPort
+
+		default:
 			e.dnsForwardMgr.UpdateDomains(fwdEntries)
 		}
 	} else if e.dnsForwardMgr != nil {
@@ -1874,6 +1883,20 @@ func (e *Engine) updateDNSForwarder(
 		}
 		e.dnsForwardMgr = nil
 	}
+
+}
+
+func (e *Engine) restartDnsFwd(fwdEntries []*dnsfwd.ForwarderEntry, forwarderPort uint16) {
+	log.Infof("updating domain router service port from %d to %d", e.dnsFwdPort, forwarderPort)
+	// stop and start the forwarder to apply the new port
+	if err := e.dnsForwardMgr.Stop(context.Background()); err != nil {
+		log.Errorf("failed to stop DNS forward: %v", err)
+	}
+	e.dnsForwardMgr = dnsfwd.NewManager(e.firewall, e.statusRecorder, forwarderPort)
+	if err := e.dnsForwardMgr.Start(fwdEntries); err != nil {
+		log.Errorf("failed to start DNS forward: %v", err)
+		e.dnsForwardMgr = nil
+	}
 }
 
 func (e *Engine) GetNet() (*netstack.Net, error) {

client/internal/netflow/logger/logger.go

@@ -138,7 +138,7 @@ func (l *Logger) UpdateConfig(dnsCollection, exitNodeCollection bool) {
 
 func (l *Logger) shouldStore(event *types.EventFields, isExitNode bool) bool {
 	// check dns collection
-	if !l.dnsCollection.Load() && event.Protocol == types.UDP && (event.DestPort == 53 || event.DestPort == dnsfwd.ListenPort) {
+	if !l.dnsCollection.Load() && event.Protocol == types.UDP && (event.DestPort == 53 || event.DestPort == uint16(dnsfwd.ListenPort())) {
 		return false
 	}
 

client/internal/routemanager/dnsinterceptor/handler.go

@@ -24,8 +24,8 @@ import (
 	"github.com/netbirdio/netbird/client/internal/routemanager/common"
 	"github.com/netbirdio/netbird/client/internal/routemanager/fakeip"
 	"github.com/netbirdio/netbird/client/internal/routemanager/refcounter"
-	"github.com/netbirdio/netbird/shared/management/domain"
 	"github.com/netbirdio/netbird/route"
+	"github.com/netbirdio/netbird/shared/management/domain"
 )
 
 const dnsTimeout = 8 * time.Second
@@ -257,7 +257,7 @@ func (d *DnsInterceptor) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 		r.MsgHdr.AuthenticatedData = true
 	}
 
-	upstream := fmt.Sprintf("%s:%d", upstreamIP.String(), dnsfwd.ListenPort)
+	upstream := fmt.Sprintf("%s:%d", upstreamIP.String(), dnsfwd.ListenPort())
 	ctx, cancel := context.WithTimeout(context.Background(), dnsTimeout)
 	defer cancel()
 

go.mod

@@ -102,6 +102,7 @@ require (
 	goauthentik.io/api/v3 v3.2023051.3
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
 	golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a
+	golang.org/x/mod v0.25.0
 	golang.org/x/net v0.42.0
 	golang.org/x/oauth2 v0.28.0
 	golang.org/x/sync v0.16.0
@@ -243,7 +244,6 @@ require (
 	go.uber.org/mock v0.4.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/image v0.18.0 // indirect
-	golang.org/x/mod v0.25.0 // indirect
 	golang.org/x/text v0.27.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
 	golang.org/x/tools v0.34.0 // indirect

management/server/dns.go

@@ -6,9 +6,11 @@ import (
 	"sync"
 
 	log "github.com/sirupsen/logrus"
+	"golang.org/x/mod/semver"
 
 	nbdns "github.com/netbirdio/netbird/dns"
 	"github.com/netbirdio/netbird/management/server/activity"
+	nbpeer "github.com/netbirdio/netbird/management/server/peer"
 	"github.com/netbirdio/netbird/management/server/permissions/modules"
 	"github.com/netbirdio/netbird/management/server/permissions/operations"
 	"github.com/netbirdio/netbird/management/server/store"
@@ -18,6 +20,13 @@ import (
 	"github.com/netbirdio/netbird/shared/management/status"
 )
 
+const (
+	dnsForwarderPort = 22054
+	oldForwarderPort = 5353
+)
+
+const dnsForwarderPortMinVersion = "v0.59.0"
+
 // DNSConfigCache is a thread-safe cache for DNS configuration components
 type DNSConfigCache struct {
 	NameServerGroups sync.Map
@@ -183,12 +192,45 @@ func validateDNSSettings(ctx context.Context, transaction store.Store, accountID
 	return validateGroups(settings.DisabledManagementGroups, groups)
 }
 
+// computeForwarderPort checks if all peers in the account have updated to a specific version or newer.
+// If all peers have the required version, it returns the new well-known port (22054), otherwise returns 0.
+func computeForwarderPort(peers []*nbpeer.Peer, requiredVersion string) int64 {
+	if len(peers) == 0 {
+		return oldForwarderPort
+	}
+
+	reqVer := semver.Canonical(requiredVersion)
+
+	// Check if all peers have the required version or newer
+	for _, peer := range peers {
+
+		// Development version is always supported
+		if peer.Meta.WtVersion == "development" {
+			continue
+		}
+		peerVersion := semver.Canonical("v" + peer.Meta.WtVersion)
+		if peerVersion == "" {
+			// If any peer doesn't have version info, return 0
+			return oldForwarderPort
+		}
+
+		// Compare versions
+		if semver.Compare(peerVersion, reqVer) < 0 {
+			return oldForwarderPort
+		}
+	}
+
+	// All peers have the required version or newer
+	return dnsForwarderPort
+}
+
 // toProtocolDNSConfig converts nbdns.Config to proto.DNSConfig using the cache
-func toProtocolDNSConfig(update nbdns.Config, cache *DNSConfigCache) *proto.DNSConfig {
+func toProtocolDNSConfig(update nbdns.Config, cache *DNSConfigCache, forwardPort int64) *proto.DNSConfig {
 	protoUpdate := &proto.DNSConfig{
 		ServiceEnable:    update.ServiceEnable,
 		CustomZones:      make([]*proto.CustomZone, 0, len(update.CustomZones)),
 		NameServerGroups: make([]*proto.NameServerGroup, 0, len(update.NameServerGroups)),
+		ForwarderPort:    forwardPort,
 	}
 
 	for _, zone := range update.CustomZones {

management/server/dns_test.go

@@ -21,7 +21,6 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/netbirdio/netbird/dns"
 	"github.com/netbirdio/netbird/management/server/activity"
 	nbpeer "github.com/netbirdio/netbird/management/server/peer"
 	"github.com/netbirdio/netbird/shared/management/status"
@@ -324,13 +323,13 @@ func initTestDNSAccount(t *testing.T, am *DefaultAccountManager) (*types.Account
 		return nil, err
 	}
 
-	account.NameServerGroups[dnsNSGroup1] = &dns.NameServerGroup{
+	account.NameServerGroups[dnsNSGroup1] = &nbdns.NameServerGroup{
 		ID:   dnsNSGroup1,
 		Name: "ns-group-1",
-		NameServers: []dns.NameServer{{
+		NameServers: []nbdns.NameServer{{
 			IP:     netip.MustParseAddr(savedPeer1.IP.String()),
-			NSType: dns.UDPNameServerType,
+			NSType: nbdns.UDPNameServerType,
-			Port:   dns.DefaultDNSPort,
+			Port:   nbdns.DefaultDNSPort,
 		}},
 		Primary: true,
 		Enabled: true,
@@ -395,7 +394,7 @@ func BenchmarkToProtocolDNSConfig(b *testing.B) {
 
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
-				toProtocolDNSConfig(testData, cache)
+				toProtocolDNSConfig(testData, cache, dnsForwarderPort)
 			}
 		})
 
@@ -403,7 +402,7 @@ func BenchmarkToProtocolDNSConfig(b *testing.B) {
 			b.ResetTimer()
 			for i := 0; i < b.N; i++ {
 				cache := &DNSConfigCache{}
-				toProtocolDNSConfig(testData, cache)
+				toProtocolDNSConfig(testData, cache, dnsForwarderPort)
 			}
 		})
 	}
@@ -456,13 +455,13 @@ func TestToProtocolDNSConfigWithCache(t *testing.T) {
 	}
 
 	// First run with config1
-	result1 := toProtocolDNSConfig(config1, &cache)
+	result1 := toProtocolDNSConfig(config1, &cache, dnsForwarderPort)
 
 	// Second run with config2
-	result2 := toProtocolDNSConfig(config2, &cache)
+	result2 := toProtocolDNSConfig(config2, &cache, dnsForwarderPort)
 
 	// Third run with config1 again
-	result3 := toProtocolDNSConfig(config1, &cache)
+	result3 := toProtocolDNSConfig(config1, &cache, dnsForwarderPort)
 
 	// Verify that result1 and result3 are identical
 	if !reflect.DeepEqual(result1, result3) {
@@ -483,6 +482,107 @@ func TestToProtocolDNSConfigWithCache(t *testing.T) {
 	}
 }
 
+func TestComputeForwarderPort(t *testing.T) {
+	// Test with empty peers list
+	peers := []*nbpeer.Peer{}
+	result := computeForwarderPort(peers, "v0.59.0")
+	if result != oldForwarderPort {
+		t.Errorf("Expected %d for empty peers list, got %d", oldForwarderPort, result)
+	}
+
+	// Test with peers that have old versions
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.57.0",
+			},
+		},
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.26.0",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result != oldForwarderPort {
+		t.Errorf("Expected %d for peers with old versions, got %d", oldForwarderPort, result)
+	}
+
+	// Test with peers that have new versions
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.59.0",
+			},
+		},
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.59.0",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result != dnsForwarderPort {
+		t.Errorf("Expected %d for peers with new versions, got %d", dnsForwarderPort, result)
+	}
+
+	// Test with peers that have mixed versions
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.59.0",
+			},
+		},
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "0.57.0",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result != oldForwarderPort {
+		t.Errorf("Expected %d for peers with mixed versions, got %d", oldForwarderPort, result)
+	}
+
+	// Test with peers that have empty version
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result != oldForwarderPort {
+		t.Errorf("Expected %d for peers with empty version, got %d", oldForwarderPort, result)
+	}
+
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "development",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result == oldForwarderPort {
+		t.Errorf("Expected %d for peers with dev version, got %d", dnsForwarderPort, result)
+	}
+
+	// Test with peers that have unknown version string
+	peers = []*nbpeer.Peer{
+		{
+			Meta: nbpeer.PeerSystemMeta{
+				WtVersion: "unknown",
+			},
+		},
+	}
+	result = computeForwarderPort(peers, "v0.59.0")
+	if result != oldForwarderPort {
+		t.Errorf("Expected %d for peers with unknown version, got %d", oldForwarderPort, result)
+	}
+}
+
 func TestDNSAccountPeersUpdate(t *testing.T) {
 	manager, account, peer1, peer2, peer3 := setupNetworkMapTest(t)
 
@@ -534,10 +634,10 @@ func TestDNSAccountPeersUpdate(t *testing.T) {
 		}()
 
 		_, err = manager.CreateNameServerGroup(
-			context.Background(), account.Id, "ns-group", "ns-group", []dns.NameServer{{
+			context.Background(), account.Id, "ns-group", "ns-group", []nbdns.NameServer{{
 				IP:     netip.MustParseAddr(peer1.IP.String()),
-				NSType: dns.UDPNameServerType,
+				NSType: nbdns.UDPNameServerType,
-				Port:   dns.DefaultDNSPort,
+				Port:   nbdns.DefaultDNSPort,
 			}},
 			[]string{"groupB"},
 			true, []string{}, true, userID, false,
@@ -567,10 +667,10 @@ func TestDNSAccountPeersUpdate(t *testing.T) {
 		}()
 
 		_, err = manager.CreateNameServerGroup(
-			context.Background(), account.Id, "ns-group-1", "ns-group-1", []dns.NameServer{{
+			context.Background(), account.Id, "ns-group-1", "ns-group-1", []nbdns.NameServer{{
 				IP:     netip.MustParseAddr(peer1.IP.String()),
-				NSType: dns.UDPNameServerType,
+				NSType: nbdns.UDPNameServerType,
-				Port:   dns.DefaultDNSPort,
+				Port:   nbdns.DefaultDNSPort,
 			}},
 			[]string{"groupA"},
 			true, []string{}, true, userID, false,

management/server/grpcserver.go

@@ -715,13 +715,13 @@ func toPeerConfig(peer *nbpeer.Peer, network *types.Network, dnsName string, set
 	}
 }
 
-func toSyncResponse(ctx context.Context, config *nbconfig.Config, peer *nbpeer.Peer, turnCredentials *Token, relayCredentials *Token, networkMap *types.NetworkMap, dnsName string, checks []*posture.Checks, dnsCache *DNSConfigCache, settings *types.Settings, extraSettings *types.ExtraSettings, peerGroups []string) *proto.SyncResponse {
+func toSyncResponse(ctx context.Context, config *nbconfig.Config, peer *nbpeer.Peer, turnCredentials *Token, relayCredentials *Token, networkMap *types.NetworkMap, dnsName string, checks []*posture.Checks, dnsCache *DNSConfigCache, settings *types.Settings, extraSettings *types.ExtraSettings, peerGroups []string, dnsFwdPort int64) *proto.SyncResponse {
 	response := &proto.SyncResponse{
 		PeerConfig: toPeerConfig(peer, networkMap.Network, dnsName, settings),
 		NetworkMap: &proto.NetworkMap{
 			Serial:    networkMap.Network.CurrentSerial(),
 			Routes:    toProtocolRoutes(networkMap.Routes),
-			DNSConfig: toProtocolDNSConfig(networkMap.DNSConfig, dnsCache),
+			DNSConfig: toProtocolDNSConfig(networkMap.DNSConfig, dnsCache, dnsFwdPort),
 		},
 		Checks: toProtocolChecks(ctx, checks),
 	}
@@ -732,11 +732,11 @@ func toSyncResponse(ctx context.Context, config *nbconfig.Config, peer *nbpeer.P
 
 	response.NetworkMap.PeerConfig = response.PeerConfig
 
-	allPeers := make([]*proto.RemotePeerConfig, 0, len(networkMap.Peers)+len(networkMap.OfflinePeers))
+	remotePeers := make([]*proto.RemotePeerConfig, 0, len(networkMap.Peers)+len(networkMap.OfflinePeers))
-	allPeers = appendRemotePeerConfig(allPeers, networkMap.Peers, dnsName)
+	remotePeers = appendRemotePeerConfig(remotePeers, networkMap.Peers, dnsName)
-	response.RemotePeers = allPeers
+	response.RemotePeers = remotePeers
-	response.NetworkMap.RemotePeers = allPeers
+	response.NetworkMap.RemotePeers = remotePeers
-	response.RemotePeersIsEmpty = len(allPeers) == 0
+	response.RemotePeersIsEmpty = len(remotePeers) == 0
 	response.NetworkMap.RemotePeersIsEmpty = response.RemotePeersIsEmpty
 
 	response.NetworkMap.OfflinePeers = appendRemotePeerConfig(nil, networkMap.OfflinePeers, dnsName)
@@ -808,7 +808,14 @@ func (s *GRPCServer) sendInitialSync(ctx context.Context, peerKey wgtypes.Key, p
 		return status.Errorf(codes.Internal, "failed to get peer groups %s", err)
 	}
 
-	plainResp := toSyncResponse(ctx, s.config, peer, turnToken, relayToken, networkMap, s.accountManager.GetDNSDomain(settings), postureChecks, nil, settings, settings.Extra, peerGroups)
+	// Get all peers in the account for forwarder port computation
+	allPeers, err := s.accountManager.GetStore().GetAccountPeers(ctx, store.LockingStrengthNone, peer.AccountID, "", "")
+	if err != nil {
+		return fmt.Errorf("get account peers: %w", err)
+	}
+	dnsFwdPort := computeForwarderPort(allPeers, dnsForwarderPortMinVersion)
+
+	plainResp := toSyncResponse(ctx, s.config, peer, turnToken, relayToken, networkMap, s.accountManager.GetDNSDomain(settings), postureChecks, nil, settings, settings.Extra, peerGroups, dnsFwdPort)
 
 	encryptedResp, err := encryption.EncryptMessage(peerKey, s.wgKey, plainResp)
 	if err != nil {

management/server/peer.go

@@ -729,7 +729,7 @@ func (am *DefaultAccountManager) SyncPeer(ctx context.Context, sync types.PeerSy
 	var peer *nbpeer.Peer
 	var peerNotValid bool
 	var isStatusChanged bool
-	var updated bool
+	var updated, versionChanged bool
 	var err error
 	var postureChecks []*posture.Checks
 
@@ -769,7 +769,7 @@ func (am *DefaultAccountManager) SyncPeer(ctx context.Context, sync types.PeerSy
 			return err
 		}
 
-		updated = peer.UpdateMetaIfNew(sync.Meta)
+		updated, versionChanged = peer.UpdateMetaIfNew(sync.Meta)
 		if updated {
 			am.metrics.AccountManagerMetrics().CountPeerMetUpdate()
 			log.WithContext(ctx).Tracef("peer %s metadata updated", peer.ID)
@@ -788,7 +788,7 @@ func (am *DefaultAccountManager) SyncPeer(ctx context.Context, sync types.PeerSy
 		return nil, nil, nil, err
 	}
 
-	if isStatusChanged || sync.UpdateAccountPeers || (updated && len(postureChecks) > 0) {
+	if isStatusChanged || sync.UpdateAccountPeers || (updated && (len(postureChecks) > 0 || versionChanged)) {
 		am.BufferUpdateAccountPeers(ctx, accountID)
 	}
 
@@ -880,7 +880,7 @@ func (am *DefaultAccountManager) LoginPeer(ctx context.Context, login types.Peer
 			return err
 		}
 
-		isPeerUpdated = peer.UpdateMetaIfNew(login.Meta)
+		isPeerUpdated, _ = peer.UpdateMetaIfNew(login.Meta)
 		if isPeerUpdated {
 			am.metrics.AccountManagerMetrics().CountPeerMetUpdate()
 			shouldStorePeer = true
@@ -1229,6 +1229,8 @@ func (am *DefaultAccountManager) UpdateAccountPeers(ctx context.Context, account
 		return
 	}
 
+	dnsFwdPort := computeForwarderPort(maps.Values(account.Peers), dnsForwarderPortMinVersion)
+
 	for _, peer := range account.Peers {
 		if !am.peersUpdateManager.HasChannel(peer.ID) {
 			log.WithContext(ctx).Tracef("peer %s doesn't have a channel, skipping network map update", peer.ID)
@@ -1265,7 +1267,7 @@ func (am *DefaultAccountManager) UpdateAccountPeers(ctx context.Context, account
 
 			peerGroups := account.GetPeerGroups(p.ID)
 			start = time.Now()
-			update := toSyncResponse(ctx, nil, p, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSetting, maps.Keys(peerGroups))
+			update := toSyncResponse(ctx, nil, p, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSetting, maps.Keys(peerGroups), dnsFwdPort)
 			am.metrics.UpdateChannelMetrics().CountToSyncResponseDuration(time.Since(start))
 
 			am.peersUpdateManager.SendUpdate(ctx, p.ID, &UpdateMessage{Update: update, NetworkMap: remotePeerNetworkMap})
@@ -1376,7 +1378,9 @@ func (am *DefaultAccountManager) UpdateAccountPeer(ctx context.Context, accountI
 	}
 
 	peerGroups := account.GetPeerGroups(peerId)
-	update := toSyncResponse(ctx, nil, peer, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSettings, maps.Keys(peerGroups))
+	dnsFwdPort := computeForwarderPort(maps.Values(account.Peers), dnsForwarderPortMinVersion)
+
+	update := toSyncResponse(ctx, nil, peer, nil, nil, remotePeerNetworkMap, dnsDomain, postureChecks, dnsCache, account.Settings, extraSettings, maps.Keys(peerGroups), dnsFwdPort)
 	am.peersUpdateManager.SendUpdate(ctx, peer.ID, &UpdateMessage{Update: update, NetworkMap: remotePeerNetworkMap})
 }
 
@@ -1549,6 +1553,8 @@ func deletePeers(ctx context.Context, am *DefaultAccountManager, transaction sto
 		return nil, err
 	}
 
+	dnsFwdPort := computeForwarderPort(peers, dnsForwarderPortMinVersion)
+
 	for _, peer := range peers {
 		if err := transaction.RemovePeerFromAllGroups(ctx, peer.ID); err != nil {
 			return nil, fmt.Errorf("failed to remove peer %s from groups", peer.ID)
@@ -1592,6 +1598,9 @@ func deletePeers(ctx context.Context, am *DefaultAccountManager, transaction sto
 					RemotePeersIsEmpty:   true,
 					FirewallRules:        []*proto.FirewallRule{},
 					FirewallRulesIsEmpty: true,
+					DNSConfig: &proto.DNSConfig{
+						ForwarderPort: dnsFwdPort,
+					},
 				},
 			},
 			NetworkMap: &types.NetworkMap{},

management/server/peer/peer.go

@@ -233,21 +233,24 @@ func (p *Peer) Copy() *Peer {
 
 // UpdateMetaIfNew updates peer's system metadata if new information is provided
 // returns true if meta was updated, false otherwise
-func (p *Peer) UpdateMetaIfNew(meta PeerSystemMeta) bool {
+func (p *Peer) UpdateMetaIfNew(meta PeerSystemMeta) (updated, versionChanged bool) {
 	if meta.isEmpty() {
-		return false
+		return updated, versionChanged
 	}
 
+	versionChanged = p.Meta.WtVersion != meta.WtVersion
+
 	// Avoid overwriting UIVersion if the update was triggered sole by the CLI client
 	if meta.UIVersion == "" {
 		meta.UIVersion = p.Meta.UIVersion
 	}
 
 	if p.Meta.isEqual(meta) {
-		return false
+		return updated, versionChanged
 	}
 	p.Meta = meta
-	return true
+	updated = true
+	return updated, versionChanged
 }
 
 // GetLastLogin returns the last login time of the peer.

management/server/peer_test.go

@@ -1161,7 +1161,7 @@ func TestToSyncResponse(t *testing.T) {
 	}
 	dnsCache := &DNSConfigCache{}
 	accountSettings := &types.Settings{RoutingPeerDNSResolutionEnabled: true}
-	response := toSyncResponse(context.Background(), config, peer, turnRelayToken, turnRelayToken, networkMap, dnsName, checks, dnsCache, accountSettings, nil, []string{})
+	response := toSyncResponse(context.Background(), config, peer, turnRelayToken, turnRelayToken, networkMap, dnsName, checks, dnsCache, accountSettings, nil, []string{}, dnsForwarderPort)
 
 	assert.NotNil(t, response)
 	// assert peer config
@@ -1212,6 +1212,7 @@ func TestToSyncResponse(t *testing.T) {
 	assert.Equal(t, "route1", response.NetworkMap.Routes[0].NetID)
 	// assert network map DNSConfig
 	assert.Equal(t, true, response.NetworkMap.DNSConfig.ServiceEnable)
+	assert.Equal(t, int64(dnsForwarderPort), response.NetworkMap.DNSConfig.ForwarderPort)
 	assert.Equal(t, 1, len(response.NetworkMap.DNSConfig.CustomZones))
 	assert.Equal(t, 2, len(response.NetworkMap.DNSConfig.NameServerGroups))
 	// assert network map DNSConfig.CustomZones

shared/management/proto/management.pb.go

@@ -7,12 +7,13 @@
 package proto
 
 import (
+	reflect "reflect"
+	sync "sync"
+
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
-	reflect "reflect"
-	sync "sync"
 )
 
 const (
@@ -2491,6 +2492,7 @@ type DNSConfig struct {
 	ServiceEnable    bool               `protobuf:"varint,1,opt,name=ServiceEnable,proto3" json:"ServiceEnable,omitempty"`
 	NameServerGroups []*NameServerGroup `protobuf:"bytes,2,rep,name=NameServerGroups,proto3" json:"NameServerGroups,omitempty"`
 	CustomZones      []*CustomZone      `protobuf:"bytes,3,rep,name=CustomZones,proto3" json:"CustomZones,omitempty"`
+	ForwarderPort    int64              `protobuf:"varint,4,opt,name=ForwarderPort,proto3" json:"ForwarderPort,omitempty"`
 }
 
 func (x *DNSConfig) Reset() {
@@ -2546,6 +2548,13 @@ func (x *DNSConfig) GetCustomZones() []*CustomZone {
 	return nil
 }
 
+func (x *DNSConfig) GetForwarderPort() int64 {
+	if x != nil {
+		return x.ForwarderPort
+	}
+	return 0
+}
+
 // CustomZone represents a dns.CustomZone
 type CustomZone struct {
 	state         protoimpl.MessageState
@@ -3721,7 +3730,7 @@ var file_management_proto_rawDesc = []byte{
 	0x18, 0x09, 0x20, 0x01, 0x28, 0x08, 0x52, 0x09, 0x6b, 0x65, 0x65, 0x70, 0x52, 0x6f, 0x75, 0x74,
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@@ -3732,157 +3741,160 @@ var file_management_proto_rawDesc = []byte{
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 }
 
 var (

shared/management/proto/management.proto

@@ -410,6 +410,7 @@ message DNSConfig {
   bool ServiceEnable = 1;
   repeated NameServerGroup NameServerGroups = 2;
   repeated CustomZone CustomZones = 3;
+  int64 ForwarderPort = 4;
 }
 
 // CustomZone represents a dns.CustomZone