diff --git a/netcard.go b/netcard.go
index 918cfcf..f9949ae 100644
--- a/netcard.go
+++ b/netcard.go
@@ -20,7 +20,9 @@ import (
 )
 
 type NetTunnel struct {
-	ifce     *water.Interface
+	ifce  *water.Interface
+	ifmac []byte
+
 	shutdown *perfectshutdown.PerfectShutdown
 	writer   chan []byte
 	reader   chan []byte
@@ -78,6 +80,17 @@ func NewNetTunnel() *NetTunnel {
 		log.Panic(err)
 	}
 
+	ifas, err := net.Interfaces()
+	if err != nil {
+		log.Panic(err)
+	}
+
+	for _, ifa := range ifas {
+		if ifa.Name == nt.ifce.Name() {
+			nt.ifmac = ifa.HardwareAddr[0:6]
+		}
+	}
+
 	go func() {
 
 		for rbuf := range nt.reader {
@@ -134,6 +147,7 @@ func NewNetTunnel() *NetTunnel {
 		for wbuf := range nt.writer {
 			var frame ethernet.Frame = wbuf
 			log.Printf("ifce write %d", len(frame))
+			copy(frame[0:6], nt.ifmac)
 			_, err := nt.ifce.Write(frame)
 			if err != nil {
 				log.Println(err)