Subject: Question On Retransmission timer

From: Balaji Ramakrishnan <[email-masked]>
Date: Mon, 12 Nov 2001 15:33:30 +0530

Hi
1.I have one basic doubt in TCP retransmissions.
   What is an loss in a network ?
   Eg.If u are in Congestion avoidance phase and we have sent 10 segments
   If one segment 's RTT gets timed out.Is it a case of  loss and we go to
   slow start.

2.Also reg SACK - SACK is used by Tx during retransmissions.
   Retransmisions occur
   1.Due to Fast Retransmit
   2.Due to Retransmission timeout also.
               Also in the end of RFC2018 they have specified that SACK 
info should be discarded
     when a timeout happens.(what this timeout refer to actually).

Expecting some reply.
Thankx in advance
Balaji.R