diff --git a/weed/server/volume_server_udp_handlers.go b/weed/server/volume_server_udp_handlers.go
index e0dc94310..2f7563f4c 100644
--- a/weed/server/volume_server_udp_handlers.go
+++ b/weed/server/volume_server_udp_handlers.go
@@ -41,6 +41,7 @@ func (vs *VolumeServer) ServeTFTP(r tftp.ReadRequest) {
 func (vs *VolumeServer) ReceiveTFTP(w tftp.WriteRequest) {
 
 	filename := w.Name()
+	println("+ ", filename)
 
 	// Get the file size
 	size, err := w.Size()
@@ -75,4 +76,6 @@ func (vs *VolumeServer) ReceiveTFTP(w tftp.WriteRequest) {
 		return
 	}
 
+	println("- ", filename)
+
 }
diff --git a/weed/wdclient/volume_udp_client.go b/weed/wdclient/volume_udp_client.go
index 2daf37bfc..b8bdcec90 100644
--- a/weed/wdclient/volume_udp_client.go
+++ b/weed/wdclient/volume_udp_client.go
@@ -3,8 +3,8 @@ package wdclient
 import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
-	"pack.ag/tftp"
 	"io"
+	"pack.ag/tftp"
 )
 
 // VolumeTcpClient put/get/delete file chunks directly on volume servers without replication
@@ -23,15 +23,24 @@ func (c *VolumeUdpClient) PutFileChunk(volumeServerAddress string, fileId string
 		return parseErr
 	}
 
-	udpClient, _ := tftp.NewClient()
+	udpClient, _ := tftp.NewClient(
+		tftp.ClientMode(tftp.ModeOctet),
+		tftp.ClientBlocksize(9000),
+		tftp.ClientWindowsize(16),
+		tftp.ClientTimeout(1),
+		tftp.ClientTransferSize(true),
+		tftp.ClientRetransmit(3),
+	)
 
-	fileUrl := "tftp://"+udpAddress+"/"+fileId
+	fileUrl := "tftp://" + udpAddress + "/" + fileId
 
+	// println("put", fileUrl, "...")
 	err = udpClient.Put(fileUrl, fileReader, int64(fileSize))
 	if err != nil {
 		glog.Errorf("udp put %s: %v", fileUrl, err)
 		return
 	}
+	// println("sent", fileUrl)
 
 	return
 }