Re: [nwebe] How to track TCP socket variables? (cwnd, ssthresh)

From: Lev Walkin (vlm_at_netli.com)
Date: 04/10/04

  • Next message: Ruslan Ermilov: "Per-interface polling(4) status" 
    Date: Sat, 10 Apr 2004 07:02:42 -0700
To: Knocke <knockefreebsd@o2.pl>

    Knocke wrote:
    > thanks :-) I must admit that Stevens says sth about that tool.
    >
    > But there's still (at least) one thing I don't understand: how to enable
    > socket debbuging? Is it possible only when socket is created (fe: by some
    > special system call) ? If yes, does it mean that it depends on the
    > aplication itself, if it opens its sockets for debbuging and/or if it gives
    > a command line switch command to turn it on?

    Yes, the application must use setsockopt() call to enable socket debugging.
    If an application does not turn it on, you can create a simple library
    which would substitute socket() with socket()+setsockopt(SO_DEBUG) pair,
    and attach it to the application via LD_PRELOAD.

    > hk
    >
    >
    > ----- Original Message -----
    > From: "Bruce M Simpson" <bms@spc.org>
    > To: "Knocke" <knockefreebsd@o2.pl>
    > Cc: <freebsd-net@freebsd.org>
    > Sent: Saturday, April 10, 2004 2:00 PM
    > Subject: Re: [nwebe] How to track TCP socket variables? (cwnd, ssthresh)
    >
    >
    >
    >>On Sat, Apr 10, 2004 at 01:23:24PM +0200, Knocke wrote:
    >>
    >>>Could somebode give me hint what to do? Is there any tool to connect to
    >
    > existing TCP socket and dump its state per each segment sent or received? Or
    > any other way to achive the goal? It could be also a kind of dedicated
    > benchmark tool (lice ttcp) that comes togehter with what i need, I don't
    > necesarly need to track existing sshd or apache owned sockets.
    >
    >>man 8 trpt
    >>
    >>BMS
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    >>
    >
    >
    >
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    -- 
Lev Walkin
vlm@netli.com
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