Re: [jgroups-dev] Wireshark plugin for JGroups

If you enable use_mcast_xmit you will never get XMIT_RSPs


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-------- Original message --------
From: Dine <[email protected]> 
Date: 20/06/2013  8:13 AM  (GMT-08:00) 
To: [email protected] 
Subject: Re: [jgroups-dev] Wireshark plugin for JGroups 
 
Hello,

We are trying to update the “jgroups-wireshark-plugin” for
JGroups-3.3.0.Final.
To validate the plugin developpement, we test it on samples.

Actually, we have a problem.
We have made a sample that “force” the JGroups retansmission process.

In wireshark, we see messages typed “retransmit resquest” (wireshark filter
"jgroups.nakackheader.msgtype == 2" for “XMIT_REQ”).
But *we never see any message typed “retransmit response”* (wireshark filter
"jgroups.nakackheader.msgtype == 3" for “XMIT_RSP”).
It seems that in our case, the message “retransmit response” are typed
“regular msg” (msg header type “MSG=1”).

We used the “NAKACK2” protocol, with “NAKACK2.use_mcast_xmit=true” (default
value).
The “ NakAckHeader2” types are : “MSG=1” for regular msg ; “XMIT_REQ=2” for
retransmit request ; and “XMIT_RSP=3” for retransmit response (contains one
or more messages).

In the methode “NAKACK2.sendXmitRsp(Address dest, Message msg)” : 
- if(use_mcast_xmit) : simply send the original multicast message   -> msg
header type “MSG=1”.
- else, copy the original msg, change type from “MSG” to “XMIT_RSP”, and
send it   ->  msg header type “XMIT_RSP=3”.

Unfortunately, we are in the case where the msg header type is “MSG=1” in
message for “retransmit response”.


Is there an other field in the message, indicating that is it a “retransmit
response” ?

Thank you for your help.
Amandine



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