[Prasad Kularatne <kularatn@xxxxxxxxxx>]

Hi Guy, Ronie and Jens,

Thanks for the input. I need to plot
the instantaneous value of the cwnd for a research currently being carried
out to find sensitivity of two traffic types. I now understand the naivity
of the question raised. How can a tool which looks at the packets being
tranmitted over an interface know what is maintained by the TCP stack of
the end points. I am really sorry.

BTW, I am using RHEL 3 (kernel 2.4.21-32.EL).
Any one heard of any tool to pull this value out?


Good Luck!
Prasad

----- Forwarded by Prasad
Kularatne/Sri Lanka/IBM on 11/15/2005 04:33 PM -----

Guy Harris <gharris@xxxxxxxxx>
Sent by: ethereal-users-bounces@xxxxxxxxxxxx

11/15/2005 09:34 AM

Please respond to
Ethereal user support

To	Ethereal user support <ethereal-users@xxxxxxxxxxxx>
cc
Subject	Re: [Ethereal-users] Re: Plotting TCP Congetion Window evolution

ronnie sahlberg wrote:

> it is not possible using any tool.

...other than tools running on one of the TCP endpoints, getting the 
congestion window from the networking stack's data structures.

This, of course, only gives you the congestion window values on one end
of the socket.

Determining which OSes have tools that can do this, and what those tools
are, is left as an exercise to the reader.

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