diff --git a/device.go b/device.go
index 3ba3255..337cd5b 100644
--- a/device.go
+++ b/device.go
@@ -131,9 +131,11 @@ func (nc *NetCard) Run() {
 func NewNetCard() *NetCard {
 
 	config := water.Config{
-		DeviceType: water.TUN,
+		DeviceType: water.TAP,
+		PlatformSpecificParams: water.PlatformSpecificParams{
+			Name: "stun",
+		},
 	}
-	config.Name = "stun"
 
 	ifce, err := water.New(config)
 	if err != nil {
diff --git a/main.go b/main.go
index bef35ea..ba1d5eb 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"log"
 	"os/exec"
@@ -17,15 +18,22 @@ func init() {
 
 //go:generate bash -c "protoc --go_out=plugins=grpc:. proto/*.proto"
 func main() {
-	// testmain()
-	NewNetCard().Run()
+	testmain()
+	// NewNetCard().Run()
 }
 
+var (
+	flagAddr = flag.String("addr", "", "addr set")
+)
+
 func testmain() {
+
+	flag.Parse()
+
 	var a chan bool = make(chan bool)
 	go func() {
 		<-a
-		cmdstr := fmt.Sprintf("ip addr add %s dev stun", "10.10.10.111")
+		cmdstr := fmt.Sprintf("ip addr add %s dev stun", *flagAddr)
 		log.Println(cmdstr)
 		cmd := strings.Split(cmdstr, " ")
 		err := exec.Command(cmd[0], cmd[1:]...).Run()
@@ -42,7 +50,7 @@ func testmain() {
 	}()
 
 	config := water.Config{
-		DeviceType: water.TUN,
+		DeviceType: water.TAP,
 	}
 	config.Name = "stun"