diff --git a/rpc.go b/rpc.go
index 3a6bf5f..9d55d7e 100644
--- a/rpc.go
+++ b/rpc.go
@@ -26,7 +26,7 @@ func newRPCServer(netCard *NetCard) *RPCServer {
 }
 
 func (rpc *RPCServer) run() {
-	flag.Parse()
+
 	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *serverPort))
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)
diff --git a/tap.go b/tap.go
index f784e65..23917ff 100644
--- a/tap.go
+++ b/tap.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"log"
 	"os/exec"
@@ -80,6 +81,7 @@ func (nc *NetCard) Run() {
 	go nc.runWrite()
 	// go nc.cli.run()
 	time.Sleep(time.Second)
+	log.Printf("ip addr add %s/24 dev stap", *cardIP)
 	cmd := strings.Split(fmt.Sprintf("ip addr add %s/24 dev stap", *cardIP), " ")
 	err := exec.Command(cmd[0], cmd[1:]...).Run()
 	if err != nil {
@@ -94,6 +96,7 @@ func (nc *NetCard) Run() {
 }
 
 func NewNetCard() *NetCard {
+	flag.Parse()
 
 	config := water.Config{
 		DeviceType: water.TAP,