| Gotcha, CWND cant be derived from the traces, but you can map out the relationship of the ACKs to TCP Window.
To view this, you can use the Time Sequence Graph (TCPTrace) located under Statistics -> TCP Stream Graph. There are a bunch of other statistics that may fit your needs there.
There is some help in the man pages and wiki. For the full tcptrace tool, you can go to www.tcptrace.org . There is also the documentation there on what you are looking at.
Hope this helps, if you have questions, feel free to ask
Kevin On Aug 28, 2007, at 1:38 PM, Becky Vict wrote: Hi Kevin,
I want to generate the statistics on TCP performance indicators for some captures I have like throughput, rtt, retransmission and cwnd.
Kevin <masonke@xxxxxxxxx> wrote: Becky,
What are you trying to find the cwnd for?
Kevin
On Aug 28, 2007, at 7:50 AM, ronnie sahlberg wrote:
> The congestion window can not be determined by looking at the packets
> themself since the congestion window is not stored in the packet
> headers.
>
> In general it is impossible to tell what the congestion window is by
> looking at traces.
> However If you know if great detail exactly how the state machine for
> the TCP you look at works you can sometimes make educated guesses of
> what the congestion window "probably is" from the trace.
> This is very very timeconsuming and probably only accurate if you know
> the sourcecode for the tcp implementation in question by heart.
>
>
>
> On 8/28/07, Becky Vict wrote:
>> Hi all,
>>
>> I have some server captures and I wonder can I get cwnd from these?
>>
>> Thanks.
>>
>>
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