How can i know how much data is transfered between a client and a server (length of the whole conversation) or how much bandiwth is being used in a given time for a given interface?

From: José Vicente Núñez Zuleta (josevnz@yahoo.com)
Date: 11/08/01

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    Message-ID: <20011109000115.19583.qmail@web10004.mail.yahoo.com>
Date: Thu, 8 Nov 2001 18:01:15 -0600 (CST)
From: José Vicente Núñez Zuleta <josevnz@yahoo.com>
Subject: How can i know how much data is transfered between a client and a server (length of the whole conversation) or how much bandiwth is being used in a given time for a given interface?

     Greetings,
      I'm trying to find out how much bandwidth is being
     consumed by a set of clients in a local network (we
     are crunching numbers and before to jumt to a Gigabit
     Ethernet we need to know if our current config is
    ok).
      I managed to measure the bandwith between the client
     and the server using iperf
     (http://dast.nlanr.net/Projects/Iperf/#previous) and
    recognized.
     to see some traffic using ethereal
     (http://www.ethereal.com/introduction.html#license)
    recognized.
     but the info was not very helpfull (because ethereal
     doesn't gave me the througput of each app).
      Now i'm using tcpdump on the server machine,
    capturing
     all the traffic that comes from the client machine as
     follows:
      [root@linux0101 src]# tcpdump -nn -i eth0 -s 9999
    -vvv
     src host 10.1.20.102 -w sniff2.log
     Then i'm processing the data with tcptrace as
    follows:
     [root@josevnz devtest]# tcptrace -l -r -W
     sniff2.log.gz
      I'm sending like 9MB of data per transaction, but
    the
     output of tcptrace is showing me only the size of the
     headers data not the whole conversation size.
      Now the questions:
      1) There is a way to tell how much data was
    exchanged
     in a conversation between a client an a server?
      2) How can i know the bandidth taken during a
    certaim
     period of time for all the clients conecting to the
     server?
      Thanks in advance,
      Jose Vicente

    =====
    System Engineer, José Vicente Nuñez Zuleta (josevnz@yahoo.com)
    Java 2 Certified Programmer
    Java 2 Certified Developer
    ------------------------------------------------------------
    Do you know "JavaVen"?,
    http://groups.yahoo.com/group/JavaVen

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