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Re: [SCTP-Discussion] FW: SCTP...


Chronological Thread 
  • From: Andreas Jungmaier <ajung AT exp-math.uni-essen.de>
  • To: Shetty K Manjunatha-A1465Z <A1465Z AT motorola.com>
  • Cc: discussion AT sctp.de
  • Subject: Re: [SCTP-Discussion] FW: SCTP...
  • Date: Tue Jan 6 10:12:00 2004
  • List-id: SCTP Discussions <discussion.sctp.de>
  • Organization: University Duisburg-Essen
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Dear Manjunatha,

> Do we really need to store the msgs that are acked by GAP Acks?

Yes. The sender needs to buffer all chunks with a TSN after
the cumulative TSN-Ack point of SACKs it received by the peer,
only the Cum TSN-Ack is obliging.

If you have a look at RFC 2960, you may want to search for
the term "reneg" to find out why.

On another topic, the *receiver* may be able to deliver the messages
belonging to the SACK gap-reports to the upper layer, in case the
SCTP stream feature allows for doing so (e.g. for unordered streams,
or message being lost belonging to different stream than all others).
And the receiver can, in this case, of course release the buffers.

Best regards,
Andreas
- --
Dipl.-Ing. Andreas Jungmaier
Computer Networking Technology Group
University of Duisburg-Essen
http://www.exp-math.uni-essen.de/~ajung
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