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Hi Elie,

if all user messages are sent in the same stream, the
server behaves correctly. It can not deliver any TSN
greater than 2951 before delivering 2951 which is
missing.

The problem is the client not (re)transmitting the TSN 2951.

Best regards
Michael

On Mar 9, 2008, at 9:51 AM, elie wrote:

Hello,
I'm observing the following scenario when using SCTP lib as
a server: a client is sending 30 data chunk in three
packets, than another 30 with a gap in the TSN (of 1). I'm
not sure why is this gap, the client is of another
implementation.

Overall it seems ok, but the problem is that it seems the
dataArriveNotif is not called for the gap acks. Here is a
sample scenario (a wireshark translation):

client ===> 12 DATA packets, TSN 2921-2932
client ===> 12 DATA packets, TSN 2933-2944
client ===> 6 DATA packets, TSN 2945-2950

server <=== SACK, Cumulative TSN ACK 2944

client ===> 12 DATA packets, TSN 2952-2963

server <=== SACK, Cumulative TSN ACK 2950
gap ack 2952 to 2963

client ===> 12 DATA packets, TSN 2964-2975
client ===> 6 DATA packets, TSN 2976-2981

server <=== SACK, Cumulative TSN ACK 2950
gap ack 2952 to 2975
server <=== SACK, Cumulative TSN ACK 2950
gap ack 2952 to 2981

For some reason I don't get dataArriveNotif for TSN greater
that 2950 (I get only the first 30). Can you please help me
with this issue,
thanks,
Elie.


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• [SCTP-Discussion] data arrive on gap acks, elie, 03/09/2008
  • Re: [SCTP-Discussion] data arrive on gap acks, Michael Tuexen, 03/09/2008
  • <Possible follow-up(s)>
  • Re: [SCTP-Discussion] data arrive on gap acks, elie, 03/09/2008

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