Subject: Re: SACK Reneging

From: <[email-masked]>
Date: Mon, 18 Jun 2007 12:39:43 -0400 (EDT)

We are investigating a new SCTP related research topic. The investigation is concerned with SACK-reneging (it could apply to both TCP and SCTP).

Can anyone provide any information about or pointers to the following questions:

How often does SACK reneging actually occur in practice?

While RFCs say end-points _must_ be able to handle
a peer doing SACK reneging, do all current OSes in
fact allow SACK reneging to occur?

Could we force SACK reneging on a machine?

Has anyone documented a case where SACK reneging occurs?

Thanks.

Ertugrul Yilmaz
University of Delaware