>From what I've observed, the normal TCP agents don't actually reliable send each packet in the stream, they only simulate the flow and congestion control dynamics that TCP would exhibit, so that the amount of generated traffic is accurate. Give the FullTCP agents a try.
Phil On 6/27/06, Arne Lie <[EMAIL PROTECTED]> wrote: > > Hi all, > > For some time I have only been interested in the congestion response of the > different TCP congestion control algorithms, and the way it balances flow > throughput to available capacity, packet drop statistics, etc. > > However, now I need to see how well TCP tackles retransmissions, e.g. with > SACK. When I inspect the event trace file, dropped packets are "never" > retransmitted, in that ns-2 seems to increment the sequence numbers (both > per flow and per simulation) all the time, > >>>>>>>making it impossible to know WHEN a retransmission is performed. > <<<<<<<<< > > Is this a correct observation? If yes, are there any workarounds? If > incorrect, how *do* I find the retransmission event, and e.g. how *many* > packets are duplicated/retransmitted (SACK vs. non-SACK)? > > best regards > > Arne >
