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Date: Fri, 28 Nov 2008 09:15:09 +0100
From: Bernt Hansson <bernt@bah.homeip.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: pf or ipf rules to allow p2p Limewire through
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Fbsd1 said the following on 2008-11-28 08:19:
> I checked the ipfilter online handbook and can not find anything about 
> rules for igmp packets, p2p or limewire. I know what a rdr statement 
> does but can not see how it can be applied to a p2p application which 
> does NOT use dedicated port numbers. The only way i can run limewire is 
> to disable my firewall and that does not make me happy.
> 
> 
> I think the conclusion is that all 3 of the freebsd firewalls are unable 
> to monitor packet exchange of p2p applications.

Of course not. Just specify multicast to get throu your firewall.

> These firewalls were 
> designed before p2p applications were developed and their (p2p) inherent 
> design is to defeat standard firewall designs.