diff --git a/main.go b/main.go
index 8c7fdbc..ea6ee86 100644
--- a/main.go
+++ b/main.go
@@ -1,15 +1,16 @@
 package main
 
 import (
+	"encoding/binary"
 	"flag"
 	"fmt"
 	"log"
+	"net"
 	"os/exec"
 	"strings"
 
 	"github.com/songgao/packets/ethernet"
 	"github.com/songgao/water"
-	"github.com/songgao/water/waterutil"
 )
 
 func init() {
@@ -18,8 +19,8 @@ func init() {
 
 //go:generate bash -c "protoc --go_out=plugins=grpc:. proto/*.proto"
 func main() {
-	// testmain()
-	NewNetCard().Run()
+	testmain()
+	// NewNetCard().Run()
 }
 
 var (
@@ -47,7 +48,7 @@ func testmain() {
 	flag.Parse()
 
 	config := water.Config{
-		DeviceType: water.TUN,
+		DeviceType: water.TAP,
 	}
 	config.Name = "stun"
 
@@ -68,15 +69,29 @@ func testmain() {
 		}
 		frame = frame[:n]
 
-		if frame.Ethertype() != ethernet.ARP {
-			log.Printf("Ethertype: % x\n", frame.Ethertype())
+		if frame.Ethertype() == ethernet.ARP || frame.Ethertype() == ethernet.AARP {
 
-			log.Printf("DstMac: %s SrcMac: %s\n", waterutil.IPv4Destination(frame), waterutil.IPv4Source(frame))
-			log.Printf("DstPort: %d SrcPort: %d\n", waterutil.IPv4DestinationPort(frame), waterutil.IPv4SourcePort(frame))
+			log.Println(binary.BigEndian.Uint16(frame[20:22]), net.IP(frame[28:32]).To4(), net.HardwareAddr(frame[22:28]), net.IP(frame[38:42]).To4(), net.HardwareAddr(frame[32:38]))
+
+			binary.BigEndian.PutUint16(frame[20:22], 2)
+			copy(frame[32:38], frame[22:28])
+
+			log.Println(binary.BigEndian.Uint16(frame[20:22]), net.IP(frame[28:32]).To4(), net.HardwareAddr(frame[22:28]), net.IP(frame[38:42]).To4(), net.HardwareAddr(frame[32:38]))
+			log.Printf("type: % x src %s dst %s len %d", frame.Ethertype(), frame.Source(), frame.Destination(), len(frame))
+			ifce.Write(frame)
 		}
 
+		// if waterutil.IsIPv4(frame) && strings.HasPrefix(waterutil.IPv4Destination(frame).String(), "10.10") {
+
+		// 	log.Printf("Src: %s(%d) Dst: %s(%d) \n", waterutil.IPv4Source(frame), waterutil.IPv4SourcePort(frame), waterutil.IPv4Destination(frame), waterutil.IPv4DestinationPort(frame))
+
+		// 	waterutil.SetIPv4Destination(frame, waterutil.IPv4Source(frame))
+		// 	// ifce.Write(frame)
+		// 	// log.Printf("DstPort: %d SrcPort: %d\n", (uint16(payload[2])<<8)|uint16(payload[3]), (uint16(payload[0])<<8)|uint16(payload[1]))
+
+		// }
+
 		// log.Printf("Payload: % x\n", frame.Payload())
 
-		ifce.Write(frame)
 	}
 }