diff --git a/main.go b/main.go
index 7b6d867..cc95037 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/songgao/packets/ethernet"
 	"github.com/songgao/water"
+	"github.com/songgao/water/waterutil"
 )
 
 func init() {
@@ -68,6 +69,7 @@ func testmain() {
 		}
 		frame = frame[:n]
 
+		log.Printf("DstMac: %s SrcMac: %s\n", waterutil.MACDestination(frame), waterutil.MACSource(frame))
 		log.Printf("Dst: %s Src: %s\n", frame.Destination(), frame.Source())
 		log.Printf("Ethertype: % x\n", frame.Ethertype())
 		// log.Printf("Payload: % x\n", frame.Payload())