Wireshark-dev: Re: [Wireshark-dev] SCTP retransmissions an RTT
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From: Michael Tuexen <Michael.Tuexen@xxxxxxxxxxxxxxxxx>
Date: Tue, 13 Feb 2007 16:12:03 +0100
Hi Luis,

see my comments in-line.

Best regards
Michael

On Feb 13, 2007, at 2:14 PM, Luis Ontanon wrote:


I need to implement the identification of retransmitted packets and
calculation of RTT to the sctp dissector.

- Is someone already working on this?

I recently committed code for SCTP reassembly. Please have a look at it.
It should be easy to add retransmission detection to it. Just look for
the TSN of the DATA chunks. The (half associations) are detected by
the port numbers and the V-tag.

- other than RFC 2960  (sec. 6.3) what other rfcs I must read in order
to implement these?

Should be OK.

- are there any caveats I must be aware before starting this venture?
For RTT detection you have to "connect" both directions of the association. 
Since you can not really use the source/destination address you have to
use a heuristic to combine both half directions.

Please let me know if you have further questions.


Thanks,

Luis

--
This information is top security. When you have read it, destroy yourself. 
-- Marshall McLuhan
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