diff --git a/device.go b/device.go
index 7ec9250..363b2a7 100644
--- a/device.go
+++ b/device.go
@@ -201,6 +201,7 @@ func (nc *NetCard) runRead() {
 					return
 				}
 			})
+
 			if realAddr == "" {
 				log.Printf("%s is not exists", waterutil.IPv4Destination(rframe))
 				continue
@@ -208,7 +209,7 @@ func (nc *NetCard) runRead() {
 
 			// log.Printf("Payload: % x\n", rframe.Payload())
 
-			log.Printf("Ethertype: % x %v\n", rframe.Ethertype(), waterutil.IsIPv4(rframe))
+			log.Printf("Ethertype: % x %v realAddr %s\n", rframe.Ethertype(), waterutil.IsIPv4(rframe), realAddr)
 			log.Printf("Dst: %s Src %s\n", waterutil.IPv4Destination(rframe), waterutil.IPv4Source(rframe))
 
 			var buffer *ExchangeBuffer