pf or ipf rules to allow p2p Limewire through

[Fbsd1]

Bernt Hansson wrote:
> Fbsd1 said the following on 2008-11-28 07:24:
>> Bernt Hansson wrote:
>>> Fbsd1 said the following on 2008-11-27 09:56:
>>>> What pf or ipf firewall keep-state rules needed to allow p2p 
>>>> application such as limewire through? Using same firewall rules as 
>>>> in handbook example.
>>>
>>> Put this in your /etc/ipnat.rules
>>>
>>> rdr rl0 0.0.0.0/0 port port# -> internal-ip port port# tcp
>>> rdr rl0 0.0.0.0/0 port port# -> internal-ip port port# udp
>>>
>>>
>>>
>>>
>>
>>
>> How about explaining just why this is going to allow p2p limewire work?
> 
> Read the handbook on ipfilter.
> http://coombs.anu.edu.au/~avalon/
> 
>> I think you are missing the fact that limewire does not use dedicated 
>> port numbers. Every session uses different port numbers and the remote 
>> computers come in on different hight port numbers.
> 
> Change port# to port range, then. Or you can skip the firewall.
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> 
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. These firewalls were 
designed before p2p applications were developed and their (p2p) inherent 
design is to defeat standard firewall designs.