Ethereal-users: Re: [Ethereal-users] RTT stats for TCP segments

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From: ronnie sahlberg <ronniesahlberg@xxxxxxxxx>
Date: Tue, 25 Jan 2005 00:58:15 +1100
click on that field to see the filter name of it.   (inside the '('
')' in teh information blurb line)


start IO graphs,    select  ADVANCED instead of packets|bytes/second

type in the name of that field above in the field textbox

try  MAX/MIN/AVG graphs for Minimum/Maximum and Average correspondingly.


Same data can be extracted in text form using tethereal,    please see
the -z io,
part of the tethereal manpage



On Mon, 24 Jan 2005 15:52:44 +0200, Alexandros Papadopoulos
<apapadop@xxxxxxxxxxxxxx> wrote:


> Hi again.
> 
> I'm trying to profile the network behavior of a client/server
> application over a relatively unstable link. It's pretty slow, and I'm
> trying to figure out who's to blame (the link or the application).
> 
> To put the link out of the question, it would be great if one had a
> measure of how long each client request took to be replied to. (of
> course that assumes that the server is ultra-fast, but it'll do)
> 
> I noticed that there is a nice field in the TCP analysis part of packet
> display, which for a certain TCP segment tells us:
> [The RTT to ACK the segment was: 0.000424000 seconds]
> 
> This is precious information - it would be ideal if it was possible to
> present it somehow aggregated - either with a graph or an exportable
> ASCII table (list?) that could be further processed. The graph for
> instance could be called "Round Trip Time to ACK segments", with the Y
> axis representing the mean time to ACK all segments ACK'ed during that
> tick.
> 
> Does such a feature exist, or can this information be otherwise obtained
> in some way?
> 
> Thanks
> 
> -A
> 
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