diff --git a/netcard.go b/netcard.go
index a46d494..e61cf85 100644
--- a/netcard.go
+++ b/netcard.go
@@ -83,7 +83,7 @@ func NewNetTunnel() *NetTunnel {
 
 			var frame ethernet.Frame = rbuf
 
-			log.Println(len(frame))
+			log.Printf("% x len: %d", frame.Ethertype(), len(frame))
 			switch frame.Ethertype() {
 			case ethernet.ARP:
 				log.Printf("bytes len: %d type(arp): % x", len(rbuf), frame.Ethertype()) // 数据长度