diff --git a/gold/link/listen.go b/gold/link/listen.go
index 2c54672..397b9cc 100644
--- a/gold/link/listen.go
+++ b/gold/link/listen.go
@@ -63,9 +63,10 @@ func (m *Me) listenthread(conn *net.UDPConn, mu *sync.Mutex) {
 		case p.IsToMe(packet.Dst):
 			packet.Data = p.Decode(uint8(packet.TeaTypeDataSZ>>28), packet.Data)
 			if p.aead != nil {
-				packet.Data = p.DecodePreshared(packet.AdditionalData(), packet.Data)
+				addt := packet.AdditionalData()
+				packet.Data = p.DecodePreshared(addt, packet.Data)
 				if packet.Data == nil {
-					logrus.Debugln("[listen] drop invalid additional data packet")
+					logrus.Debugln("[listen] drop invalid additional data packet:", addt)
 					packet.Put()
 					continue
 				}
diff --git a/gold/link/send.go b/gold/link/send.go
index 57d80b8..c6ba1a6 100644
--- a/gold/link/send.go
+++ b/gold/link/send.go
@@ -14,6 +14,7 @@ import (
 func (l *Link) WriteAndPut(p *head.Packet, istransfer bool) (n int, err error) {
 	teatype := uint8(rand.Intn(16))
 	sndcnt := atomic.AddUintptr(&l.sendcount, 1)
+	logrus.Debugln("[send] count:", sndcnt, "additional data:", uint16(sndcnt))
 	if len(p.Data) <= int(l.mtu) {
 		if !istransfer {
 			p.FillHash()