diff --git a/netcard.go b/netcard.go
index 882b962..3a9d3c5 100644
--- a/netcard.go
+++ b/netcard.go
@@ -110,6 +110,7 @@ func NewNetTunnel() *NetTunnel {
 				// })
 			case ethernet.IPv4:
 				log.Printf("bytes len: %d type(ipv4): % x", len(rbuf), frame.Ethertype())
+				log.Println(frame.Source(), frame.Destination())
 				log.Printf("src: %s(%d) dst: %s(%d)", waterutil.IPv4Source(frame), waterutil.IPv4SourcePort(frame), waterutil.IPv4Destination(frame), waterutil.IPv4DestinationPort(frame))
 				log.Println(len(frame))