Re: wireshark and RTT

[Simone Ferlin-Oliveira <ferlin () simula no>]

Hi,
I am capturing traces at client and server and only transferring in
downlink, download (s->c) direction.
I am plotting different things about these flows - window size, rtt, etc.
Depending on the plot, either one trace file or the other is appropriate,
but even like this, wireshark shows sometimes very uncommon RTT values. I
compare them with tcptrace to validate. I know approximately in which range
they should be and
sometimes wireshark shows different values compared to tcptrace -Z ... . I
am relying on tcptrace for now. captcp was another
option, but since I capture only 150B for each packet. The tool has a small
bug because it accepts only full packets. I modified
the code, but the calculations are wrong since it considers full packet
sizes only...



On 26 August 2013 15:37, NITIN GOYAL <nitinkumgoyal () gmail com> wrote:

> On Mon, Aug 26, 2013 at 6:53 PM, Simone Ferlin-Oliveira <ferlin () simula no>wrote:
>
> > Hi, I am doing a download from server to client and I want to see the RTT
> > estimates.
> > Why is that so complicated? :)
> > Thanks for the link, but there is no conclusion there, right? What was
> > the conclusion of your discussion with the wireshark forum people?
>
> I did not got conclusion as I was capturing at the client end and it
> didnot have the access to the server to take the reverse values to validate.
>
> It is not complicated but it is like how exactly you are taking the
> captures. IF you say the RTT value is not convincing, how you say they are
> not? Actually there are other ways/tools to validate the values.
>
> Like you can capture the trace and put the trace with the help of tcptrace
> tool which also calculate the RTT.
>
> Also, you can take reverse RTT calculation frm the server and validate if
> that will work for you.
>
> For me, i did like that with the help of tcptrace i was getting a bt
> different values then showed by wireshark which looked convincing to me.
>
> Regards
> Nitin
>
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