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Date: Sun, 17 Aug 2003 15:29:42 -0700
To: "geek" <geek@netcabo.pt>, <FreeBSD-questions@FreeBSD.org>
From: Mark Woodson <mwoodson@sricrm.com>
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Subject: Re: [JunkMail] IPF & DHCP request
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At 09:29 PM 8/17/2003 +0100, geek wrote:
>Hey guys, can u please post (who have) rules with DHCP involved?! because, 
>i'm in troube, my firewall doesnt work because because my ipf.rules doesnt 
>work and i dont know why!!
>
>When i put in rules "pass in/out all" i have acess to the internet, 
>otherwise, with my rules i dont, and i have change them so many times, and 
>they didnt work anyway, if anyone can help me:
>
>block in log all
>block out log all

This should be at the end.  It's organizationally easiest if you break it 
up into by interface.  I think is overly restrictive additionally.

>pass in quick on lo0 all
>pass out quick on lo0 all
>
>pass in quick on ep0 all
>pass out quick on ep0 all
>
>
>#Allow internal traffic to outside world
>pass out quick on ep1 proto tcp all keep state
>pass out quick on ep1 proto udp all keep stateuic
>pass out quick on ep1 proto icmp all keep state
>
>
>#Allow traffic from outside
>#DNS
>pass in quick on ep1 proto udp from any to any port = 53 keep state

this really isn't necessary.  You've allowed responses to queries by the 
pass out on the interface above.

>#DHC# [dhclient]
>pass in quick on ep1 proto udp from any to any port = 68 keep state keep 
>fragsP

keep frags is really unnecessary.

I'd recommend the howto at this address.

http://www.schlacter.net/public/FreeBSD-STABLE_and_IPFILTER.html

-Mark