Subject: [tcpm] Regd TCP SACK Option

From: Karthik Balaguru <[email-masked]>
Date: Thu, 3 Dec 2009 02:57:31 +0530

Hi,
With selective acknowledgments, the data receiver
can inform the sender about all segments that have
arrived successfully, so the sender need retransmit
only the segments that have actually been lost.
Selective Acknowledgment (SACK) is a strategy
which corrects this behavior in the face of multiple
dropped segments.

But, what is the number of segments to be
dropped so that the SACK option will be sent ?
Does it depend on any other factor ?

In simple terms, Need to know the various triggers
that will send the SACK option that can inform the
sender to retransmit the lost segments alone.

Thx in advans,
Karthik Balaguru