Fix udp nat for fakeip

route/conn.go

@@ -149,16 +149,15 @@ func (m *ConnectionManager) NewPacketConnection(ctx context.Context, this N.Dial
 		} else {
 			originDestination = metadata.Destination
 		}
-		if metadata.Destination != M.SocksaddrFrom(destinationAddress, metadata.Destination.Port) {
+		if natConn, loaded := common.Cast[bufio.NATPacketConn](conn); loaded {
+			natConn.UpdateDestination(destinationAddress)
+		} else if metadata.Destination != M.SocksaddrFrom(destinationAddress, metadata.Destination.Port) {
 			if metadata.UDPDisableDomainUnmapping {
 				remotePacketConn = bufio.NewUnidirectionalNATPacketConn(bufio.NewPacketConn(remotePacketConn), M.SocksaddrFrom(destinationAddress, metadata.Destination.Port), originDestination)
 			} else {
 				remotePacketConn = bufio.NewNATPacketConn(bufio.NewPacketConn(remotePacketConn), M.SocksaddrFrom(destinationAddress, metadata.Destination.Port), originDestination)
 			}
 		}
-		if natConn, loaded := common.Cast[bufio.NATPacketConn](conn); loaded {
-			natConn.UpdateDestination(destinationAddress)
-		}
 	} else if metadata.RouteOriginalDestination.IsValid() && metadata.RouteOriginalDestination != metadata.Destination {
 		remotePacketConn = bufio.NewDestinationNATPacketConn(bufio.NewPacketConn(remotePacketConn), metadata.Destination, metadata.RouteOriginalDestination)
 	}