diff --git a/client.go b/client.go
index 28f0413..39fcd98 100644
--- a/client.go
+++ b/client.go
@@ -160,7 +160,7 @@ func (p *Client) processPacket(packet *Packet) {
 		t := time.Time{}
 		t.UnmarshalBinary(packet.data)
 		d := time.Now().Sub(t)
-		fmt.Printf("pong from %s %s %d\n", packet.src.String(), d.String(), packet.rproto)
+		fmt.Printf("pong from %s %s\n", packet.src.String(), d.String())
 		sendICMP(*p.conn, packet.src, "", "", (uint32)(DATA), packet.data, packet.rproto, 0)
 		return
 	}
diff --git a/cmd/main.go b/cmd/main.go
index 2d78e0e..54abcf0 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -31,11 +31,11 @@ Usage:
     -timeout  本地记录连接超时的时间，单位是秒，默认60s
               The time when the local record connection timed out, in seconds, 60 seconds by default
 
-    -sproto   客户端发送ping协议的协议，默认是42
-              The protocol that the client sends the ping. The default is 42.
+    -sproto   客户端发送ping协议的协议，默认是13
+              The protocol that the client sends the ping. The default is 13.
 
-    -rproto   客户端接收ping协议的协议，默认是42
-              The protocol that the client receives the ping. The default is 42.
+    -rproto   客户端接收ping协议的协议，默认是14
+              The protocol that the client receives the ping. The default is 14.
 `
 
 func main() {
@@ -45,8 +45,8 @@ func main() {
 	target := flag.String("t", "", "target addr")
 	server := flag.String("s", "", "server addr")
 	timeout := flag.Int("timeout", 60, "conn timeout")
-	sproto := flag.Int("sproto", 42, "send ping proto")
-	rproto := flag.Int("rproto", 42, "recv ping proto")
+	sproto := flag.Int("sproto", 13, "send ping proto")
+	rproto := flag.Int("rproto", 14, "recv ping proto")
 	flag.Usage = func() {
 		fmt.Printf(usage)
 	}