Subject: RE: [SIGTRAN] Clarification On SCTP SSN And TSN

From: Saraswati Bose <[email-masked]>
Date: Tue, 25 Oct 2005 04:27:08 -0700 (PDT)

Hi Brian,
           Check the below scenario related to SCTP TSN and SSn filed values and suggest.
 
Transmission mode:Ordered Delivery
Client                                  Server
DATA CHUNK-1----------------->
SSN=1, TSN=1
        <-------------------------------SACK Chunk Cum_TSN_ACK=1
 
DATA CHUNK-2----------------->
SSN=1, TSN=3
        <-------------------------------SACK Chunk Cum_TSN_ACK=1, Gap_Block=1(for TSN=2   
                                                                                                                missing)
 
DATA CHUNK-2----------------->
SSN=2, TSN=2
        <-------------------------------SACK Chunk Cum_TSN_ACK=?, Gap_Block=?. 
             
--Saraswati.                            

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From: "Brian F. G. Bidulock" <[email-masked]>
Date: Tue, 25 Oct 2005 06:43:36 -0600

Saraswati,

Saraswati Bose wrote:                                                            (Tue, 25 Oct 2005 04:27:08)
>    DATA CHUNK-2----------------->

               <-------------------------------ABORT
	       (duplicate SSN in same Stream)

This is a valid reply.  There are others.

--brian

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Brian F. G. Bidulock
[email-masked]
http://www.openss7.org/