They have motherboards made with this specific thought in mind

http://www.soekris.com/

hope that helps
Dan

>From: David Rodgers <david dot rodgers at kdsi dot net>
>To: m0n0wall at lists dot m0n0 dot ch
>Subject: [m0n0wall] 2 and 3 ethernet motherboards
>Date: Thu, 01 Jul 2004 13:21:45 -0500
>
>I am just curious if anyone here has run into any either micro atx or
>itx motherboards with either 2 or 3 ethernet ports on them. I'm looking
>for something that will use either a celeron/P3 or k6 cpu
>
>David Rodgers
>
>
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