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From: Luke Johannsen <luke@themango.org>
Date: Sun, 1 Feb 2004 14:48:02 -0600
To: "Edward Carmody" <ecarmody@shoregroup.com>
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Subject: Re: FBSD router/firewall  with dhclient & dhcpd
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On Feb 1, 2004, at 2:24 PM, Edward Carmody wrote:

> Hi, I'm trying to replace my Linksys
> router/firewall/nat box with a FreeBSD box...I'm
> in the configuring/testing phase before I put it
> into production...
>
> My *potential* problem is that my ISP
> (Cablevision) re-addresses their DNS servers
> often.  My question is: is there a way to
> dynamically update the "option
> domain-name-servers" values in dhcpd.conf from the
> "nameserver" values my ISP-facing, dhclient-using
> interface is writing into "resolv.conf"?
>
> Or, more simply, how can my DHCP server hand out
> *known-fresh-and-good* ISP dns server addresses
> gathered from the wan-facing dhcp client??  The
> linksys box I have now does this auto-magically...
> ;-)
>

I don't know if this is a solution that you want but it works for me. 
Setup DNSMasq on your firewall machine. 
http://www.thekelleys.org.uk/dnsmasq/doc.html or from the ports 
/usr/ports/dns/dnsmasq. Then just point to your internal IP on your 
firewall as your nameserver. It's quick and painless to setup and get 
running and seems to work well for small networks.