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- From: Andreas Jungmaier <ajung AT exp-math.uni-essen.de>
- To: "S.Gobinath" <gobinath AT acmet.com>
- Cc: <discussion AT sctp.de>
- Subject: Re: [SCTP-Discussion] Doubt in Handling the GAP ACK blocks in SACK
- Date: Thu Aug 5 17:57:01 2004
- List-id: SCTP Discussions <discussion.sctp.de>
- Organization: University Duisburg-Essen
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Am Donnerstag, 5. August 2004 17:46 schrieb S.Gobinath:
> Hi!
> I have doubt in sending the GAP ACK blocks in SACK.
>
> Let X = Maximum value of 4 bytes value.
> That is X = (2**32 - 1).
>
> If SYSTEM_1 sends DATA chunks with the following TSN values
> in sequence,
> TSN = X - 3
> TSN = X - 2
> TSN = X - 1
> TSN = X
> TSN = 0 (after wrapping)
> TSN = 1
> TSN = 2
> TSN = 3
> to the SYSTEM_2.
>
> Let the DATA chunk with the TSN value "X -1"is lost and
> "0"is lost.
> All other DATA chunks reach the SYSTEM_2.
> Then SYSTEM_2 should send the SACK with Cumulative TSN = "X -2" and
> other DATA chunks TSN should be ACKed by GAP ACK blocks (In offset
> values).
>
> What are the values that should be in GAP ACK blocks?
CumTSNack == X-2, Gap1=(2,2), Gap2=(4,6)
Best regards,
Andreas
- --
Dipl.-Ing. Andreas Jungmaier
Computer Networking Technology Group
University of Duisburg-Essen
http://www.exp-math.uni-essen.de/~ajung
PGP Key-ID: D382 4AC0
PGP Key-Fingerprint: 228C 7C2C 3381 2DD4 9998 2812 5C0B 0B04 D382 4AC0
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- [SCTP-Discussion] Doubt in Handling the GAP ACK blocks in SACK, S.Gobinath, 08/05/2004
- Re: [SCTP-Discussion] Doubt in Handling the GAP ACK blocks in SACK, Andreas Jungmaier, 08/05/2004
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