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Date: Thu, 09 Apr 2009 11:27:21 -0400
From: Jacques Manukyan <mlfreebsd@streamingedge.com>
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To: Frederique Rijsdijk <frederique@isafeelin.org>
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Cc: freebsd-questions@freebsd.org
Subject: Re: combining network interfaces
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Frederique Rijsdijk wrote:
> Hello,
>
> Is there a way in FreeBSD to combine a number of network interfaces to
> one virtual interface on which I can tcpdump all the traffic of those
> interfaces at once?
>   

You're talking about bridging. Look at 
http://www.freebsd.org/doc/en/books/handbook/network-bridging.html

Section 31.5.7.1 is what you're asking for.

-- Jacques Manukyan