Date: Fri, 19 Apr 2002 23:18:28 -0700 From: "Crist J. Clark" <cjc@FreeBSD.ORG> To: Michael Smith <msmith@texas.net> Cc: freebsd-net@FreeBSD.ORG Subject: Re: network traffic analysis with a network switch Message-ID: <20020419231828.B70074@blossom.cjclark.org> In-Reply-To: <20020419081453.X30314@staff.texas.net>; from msmith@texas.net on Fri, Apr 19, 2002 at 08:14:54AM -0500 References: <20020419081453.X30314@staff.texas.net>
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On Fri, Apr 19, 2002 at 08:14:54AM -0500, Michael Smith wrote:
> Not quite sure how to set this up, or even if it can be setup...
> I have a windows box, a FreeBSD box (gateway) and a RH box all
> connected to a 100base-T network switch. The FreeBSD box
> is then connected to a Cable Modem and a T1 router.
>
> I have a program on the RH box that can snoop and analyze some of
> the network traffic of the windows box, however due to the nature
> of network switches, it never sees the traffic. Don't ask about
> the analyzer, I'm rather annoyed that it was written specifically
> to compile and run only on RH and it's very close Linux relatives.
>
> Here is a rough visualization of the setup.
>
> +-------------+ +----+
> | Cable Modem | | T1 |
> +-------------+ +----+
> \ /
> +---------+
> | FreeBSD |
> +---------+
> |
> +------------------+
> | 100base-T Switch |
> +------------------+
> / | \
> +----------+ +----+ +----------+
> | Windows1 | | RH | | Windows3 |
> +----------+ +----+ +----------+
>
> What I would like to be able to do is somehow send copies of
> network traffic to the RH box without having to move it
> between the FreeBSD box and the switch. Is this possible
> and if so, how would I go about setting this up?
Tell the Windows box that RH's IP is its gateway. Turn on IP
forwarding on RH.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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