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[SCTP-Discussion] Number of miss indications


Chronological Thread 
  • From: Hendrik Land <mail AT hendrik-land.de>
  • To: discussion AT sctp.de
  • Subject: [SCTP-Discussion] Number of miss indications
  • Date: Wed Aug 30 11:22:04 2006
  • List-id: SCTP Discussions <discussion.sctp.de>

Hi,

I have a question regarding the number of miss indications before SCTP enters
Fast Retransmit/Recovery. The information in RFC4460 and
draft-ietf-tsvwg-2960bis-02 seems to be different.

draft-ietf-tsvwg-2960bis-02 states in the second paragraph of 7.2.4

"Whenever an endpoint receives a SACK that indicates that some TSNs
are missing, it SHOULD wait for 2 further miss indications (via
subsequent SACKs for a total of 3 missing reports) on the same TSNs
before taking action with regard to Fast Retransmit."

The same document states in the end of 7.2.4

"The counter increments for each
consecutive SACK reporting the TSN hole. After reaching 4 and
starting the fast retransmit procedure, the counter resets to 0."

And RFC 4460 states on p22

"Whenever an endpoint receives a SACK that indicates that some TSNs
are missing, it SHOULD wait for 3 further miss indications (via
subsequent SACKs) on the same TSN(s) before taking action with
regard to Fast Retransmit."


What is the latest word on this, 3 or 4 missing reports before a fast
retransmit?

Thanks

Hendrik







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