Subject: Duplicate Ack implementation

From: Balaji Ramakrishnan <[email-masked]>
Date: Mon, 26 Nov 2001 14:42:15 +0530

Hi all,
      In the implementation of fast retransmit algorithm we check receipt of
      duplicate acks.

 Q1.So whenever a receiver ou-of order in-sequence segment
       it should send a Duplicate ACK segment immediately.
       So can data accompany this duplicate Ack segment.
 
Q2. If data accompanies a ACK response for out -of -segment then
      how to differentiate between the normal transmission of segments
     where the RCV.nxt is copied as Ack
     i.e we are just transmitting but no segments we received.
 
Q3.Is there any RFC which says what an duplicate ack segment should contain
      for receipt of out-of -order segment or it is implementation specific.

Thankx in advance
Regards
Balaji.R