tcptrace How to Plot the Overall Averages ONLY for TPG and CWIN?

From: Ruhai Wang (wangnewton2000@yahoo.com)
Date: 02/23/05 

Message-ID: <20050223184809.3076.qmail@web53005.mail.yahoo.com>
Date: Wed, 23 Feb 2005 10:48:08 -0800 (PST)
From: Ruhai Wang <wangnewton2000@yahoo.com>
Subject: tcptrace How to Plot the Overall Averages ONLY for TPG and CWIN?

Hi Shawn and Everyone:

I realize that there are too many red lines appeared
in both CWIN and TPG graphs, especially if more than
one graphs are combined. But I want to plot ONLY the
BLUE lines (averages for the whole file transmissions)
for the TPG and CWIN graphs. In other words, I just
want to plot the overall averages for both throughput
and outstanding data? Could you advise how to do this?

R. H. Wang

--- Shawn Ostermann <sdo@picard.cs.ohiou.edu> wrote:

>
> Vaishnavi Sannidhanam <vaishu@cs.washington.edu>
> wrote:
>
> > I am plotting time sequence graphs of a tcp dump
> file. I am not quite sure
> > as to what the green line gives....The user manual
> says that "Green Line
> > keeps track of the ACK values received from the
> other endpoint". If I look
> > at the graph I am getting, it appears as if, the
> other end point keeps on
> > sending out a bunch of acks for a single seq no. I
> am attaching that file
> > along with this mail. Please let me know if this
> is what it is saying.
> >
> > Also I was wondering what are a2b files and b2a
> files if I do a tcpdump just
> > on the receiver?
>
> I'll answer the 2nd question first. TCP provides a
> duplex protocol and
> can be used for sending data in both directions.
> Because the mechanisms
> that control the reliability and flow of data in
> those directions are
> largely separate, for a connection between 'a' and
> 'b', tcptrace gives
> information about the flow of data from a->b (in
> a2b) and b->a (in b2a).
>
> There isn't enough information about the connection
> in the graph that
> you sent to know much about the transfer that you're
> trying to
> understand. The green line is indeed the
> acknowledgment line. That's
> the receiver's way of say "yes, I got all of the
> data up through
> sequence X". Because I'm seeing quite a few ACKs
> for the same sequence
> number, I assume that you're looking at half of a
> duplex conversation
> where most of the data is flowing in the OTHER
> direction. TCP includes
> an ACK in every segment (except the first) whether
> it's useful or not,
> so I would guess that most of those ACKs (the ticks
> on the green line)
> are being carried along with DATA from the other
> side. Occasionally,
> the side that you're looking at sends a little data
> too (since the green
> line is moving up).
>
> I hope that helps!
>
> Shawn
>
> --
>
-------------------------------------------------------------------------------
> Dr. Shawn Ostermann - EECS Department Chair
> - Ohio University
> 330 Stocker Center, Ohio University, Athens, Ohio
> 45701-2979
> ostermann@eecs.ohiou.edu -- FAX: (740)593-0007
> -- Voice: (740)593-1566
> http://www.eecs.ohiou.edu/faculty/ostermann.html
> http://www.eecs.ohiou.edu
>
>
>
>
>
>
>
>

> ATTACHMENT part 2 application/pgp-signature

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