Phil, Thanks, I will try the FullTCP and see if that helps. But, what kind of TCP CC algorithm is FullTCP using; can I choose between different versions?
Arne > -----Opprinnelig melding----- > Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] På vegne > av Phil Miller > Sendt: 27. juni 2006 14:30 > Til: Arne Lie > Kopi: ns-users@isi.edu > Emne: Re: [ns] TCP and packet drop: where are the > retransmitted packets? > > >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 > >
