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Date:      Wed, 17 Mar 2004 12:21:25 -0500
From:      Chuck Swiger <cswiger@mac.com>
To:        Thomas Vogt <turbo23@gmx.net>
Cc:        freebsd-ipfw@freebsd.org
Subject:   Re: layer7 filter?
Message-ID:  <40588915.1040905@mac.com>
In-Reply-To: <4058710F.4060608@gmx.net>
References:  <4058710F.4060608@gmx.net>

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Thomas Vogt wrote:
> Any plans to implement a OSI layer7 filter into ipfw? Or is there 
> already a project for fbsd? I only know 
> http://l7-filter.sourceforge.net/ but it's linux only.

The divert mechanism already present in IPFW can be used in conjuction with 
application-specific proxies to perform layer-7 filtering.  For example, 
consider diverting outbound connections to port 80 to a Squid cache, for 
example, which might also perform authentication, filtering by URL, or other 
HTTP-protocol-specific stuff.

-- 
-Chuck



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