[client] Replace the eBPF WireGuard proxy with loopback endpoint addressing (#7316)

client/internal/engine.go

@@ -661,10 +661,6 @@ func (e *Engine) Start(netbirdConfig *mgmProto.NetbirdConfig, mgmtURL *url.URL)
 	}
 	e.wgDevice.Store(e.wgInterface.GetWGDevice())
 
-	// Set up notrack rules immediately after proxy is listening to prevent
-	// conntrack entries from being created before the rules are in place
-	e.setupWGProxyNoTrack()
-
 	// Start after interface is up since port may have been resolved from 0 or changed if occupied
 	e.shutdownWg.Add(1)
 	go func() {
@@ -802,23 +798,6 @@ func (e *Engine) initFirewall() error {
 	return nil
 }
 
-// setupWGProxyNoTrack configures connection tracking exclusion for WireGuard proxy traffic.
-// This prevents conntrack/MASQUERADE from affecting loopback traffic between WireGuard and the eBPF proxy.
-func (e *Engine) setupWGProxyNoTrack() {
-	if e.firewall == nil {
-		return
-	}
-
-	proxyPort := e.wgInterface.GetProxyPort()
-	if proxyPort == 0 {
-		return
-	}
-
-	if err := e.firewall.SetupEBPFProxyNoTrack(proxyPort, uint16(e.config.WgPort)); err != nil {
-		log.Warnf("failed to setup ebpf proxy notrack: %v", err)
-	}
-}
-
 func (e *Engine) blockLanAccess() {
 	if e.config.BlockInbound {
 		// no need to set up extra deny rules if inbound is already blocked in general