diff --git a/netcard.go b/netcard.go
index a91e1d5..5225980 100644
--- a/netcard.go
+++ b/netcard.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"crypto/md5"
 	"encoding/binary"
 	"encoding/gob"
 	"fmt"
@@ -219,6 +220,9 @@ func (nc *NetCard) runRead() {
 				bytesMap[realAddr] = buffer
 			}
 
+			h := md5.New()
+			h.Write([]byte(rframe))
+			log.Printf("%x", h.Sum(nil))
 			buffer.BytesArray = append(buffer.BytesArray, []byte(rframe))
 		}
 
@@ -271,8 +275,10 @@ func (nc *NetCard) runWrite() {
 		}
 
 		for _, buf := range bufs {
+			h := md5.New()
+			h.Write(buf)
 
-			log.Printf("get wframes decode len: %d, write buf: %d", len(buf), len(buf))
+			log.Printf("get wframes decode len: %d, write buf hash: %x", len(buf), h.Sum(nil))
 			log.Printf("get decode frames decode source: %s dst: %s", waterutil.IPv4Source(buf), waterutil.IPv4Destination(buf))
 			_, err := ifce.Write(buf)
 			if err != nil {