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Re: [SCTP-Discussion] SCTP Tie tag question


Chronological Thread 
  • From: Michael Tuexen <Michael.Tuexen AT micmac.franken.de>
  • To: Marcin Zawadzki <zaba.marcin AT gmail.com>
  • Cc: sctp-discussion AT sctp.de
  • Subject: Re: [SCTP-Discussion] SCTP Tie tag question
  • Date: Fri, 20 Jan 2012 17:53:40 +0100
  • List-archive: <http://lists.franken.de/pipermail/sctp-discussion>
  • List-id: SCTP Discussions <sctp-discussion.sctp.de>

On Jan 20, 2012, at 3:15 PM, Marcin Zawadzki wrote:

> Hi,
>
> I'm currently using sctp lib 1.0.8 and I have a problem with association
> reset scenario.
>
> According to documentation RFC2960 5.2.2
> If sctp peer receives INIT chunk for already established association, it
> should send back INIT_ACK with state_cookie containing tie tags(I-Tag and
> V-Tag of the curren association)
The tie tags should be random numbers, see RFC 4960.
>
> In my case, tie tags are always set to zero, despite the fact that old
> I-Tag and V-Tag are stored properly. Association is established succesfuly
> as in COOKIE_ECHO I receive those tie tags set to 0.
If this INIT-ACK is response to an INIT for an already existing association,
they should not be 0.
So this might be a bug in the implementation.

Best regards
Michael
>
> Does anyone know why those values are zeros ? Is it proper behaviour ?
>
> Best Regards
> Marcin Zawadzki
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