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Hi,
Rfc 2960 section 5.2.4 explains how to handle cookie echo chunk when there is an association already.
But following case I couldn't corelate with whatever explained in the RFC. See the following case
and please let me know how handled according to rfc 2960



Sctp Stack A Sctp Stack B
| |
/------+------\ /------+------\
< CLOSED > < CLOSED >
\------+------/ \------+------/
Associate | |
------->| INIT {Init-Tag =x} |
|------------------------------>|
| |
/------+------\ |
< COOKIE-WAIT > |
\------+------/ |
| INIT-ACK{Init-Tag=y} |
|<------------------------------|
| | Associate
|--\ |<-----------
| \ INIT{Init-Tag=z}|
| \ /------|
| \ / |
| \ / |
| \ / /------+------\
| \ / < COOKIE-WAIT >
| \ / \------+------/
|<---------------- / |
| \ COOKIE-ECHO |
| \----------------->|
| |
| |
| |
| |

When user request to open an association at end B Stack B sends Init chunk to
stack A.
But Before this Stack B received Init from Stack A and sent Init Ack. In
Cookie Wait state
Stack B may receive COOKIE-ECHO.

COOKIE-ECHO local tie-tag = Not in cookie
remote tie-tag = Not in cookie
local tag matches doesn't match (y != z)
remote tag doesn't matches(x != 0)

For above case i am not getting any matches in RFC 2960. Please tell me how
this case is
handled.

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• [SCTP-Discussion] How this case is handled in SCTP, Vijaya Kumar, 07/20/2004
  • [SCTP-Discussion] SCTP performance measure, Le Vinh Dat, 07/22/2004
    • Re: [SCTP-Discussion] SCTP performance measure, Michael Tuexen, 07/22/2004
      • Re: [SCTP-Discussion] SCTP performance measure, Andreas Jungmaier, 07/23/2004
        • Re: [SCTP-Discussion] SCTP performance measure, Michael Tuexen, 07/23/2004
          • SV: [SCTP-Discussion] SCTP performance measure, Torbjörn Andersson, 07/26/2004
            • Re: SV: [SCTP-Discussion] SCTP performance measure, Thomas Dreibholz, 07/26/2004
    • Re: [SCTP-Discussion] SCTP performance measure, Thomas Dreibholz, 07/23/2004

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