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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 14 Nov 2005 10:13:37 -0500
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Cc: freebsd-questions@freebsd.org
Subject: Re: In a bit of a bind - DNS problems and ipfw
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Aaron Siegel <bulk_mail@siegel-tech.net> writes:

> Hello
> 
> I am having problems with my FreeBSD 5.4 gateway/firewall. When I enable a 
> custom  firewall (ipfw) or the "Simple" firewall through rc.firewall my 
> clients are unable to resolve DNS when DNS does work with the  "Open" ruleset 
> that is provide by rc.firewall.  I create the custom firewall couple years 
> ago and they work fine under 4.11 but after the upgrade I have not been able 
> to get them to work. 
> 
> I sure I am doing something stupid but I am not smart enough to solve it at 
> the moment. 
> 
> Thank you 
> Aaron Siegel
> 
> Custom firewall rules
> #Allow DNS 
> $cmd 019 allow tcp from any to any 53 out via $pif
> $cmd 018 allow udp from any to any 53 out via $pif

You need to let the replies back in.
Try keep-state.

> /etc/rc.conf
> gateway_enable="YES"
> firewall_enable="YES"
> firewall_type="open"
> natd_enable="YES"
> natd_interface="dc0"
> 
> ifconfig_dc0="192.168.0.2"  #public interface  
> ifconfig_fxp0="192.168.245.1 netmask 255.255.255.0" #private interface
> 
> /etc/rc.conf
> I have commented out the following lines
>  #${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}

Why?