Re: [jgroups-dev] Wireshark plugin for JGroups

Hi Amandine

Active development on the Wireshark plugin for JGroups dropped off 
several years ago,
due to more important work commitments. We would welcome any 
contributions you
could make, but seeing as I have not looked at the code base for such a 
long time,
I won't be able to offer any help.

The problem with development of the plugin was the translation of 
JGroups wire formats
between Java and C++, IIRC. It is a process that really needed to be 
automated some how.

If your aim is to look at the contents of JGroups packets, I believe 
Bela has developed an alternative
to using Wireshark. Bela?

Richard

On 06/20/2013 11:13 AM, Dine wrote:
> 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
>
>
>
> --
> View this message in context: http://jgroups.1086181.n5.nabble.com/Wireshark-plugin-for-JGroups-tp7029p9674.html
> Sent from the JGroups - Dev mailing list archive at Nabble.com.
>
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