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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 16 Jan 2006 09:48:49 -0500
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Cc: freebsd-questions@FreeBSD.org
Subject: Re: /etc/rc.firewall and dhclient(8)
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<pfgshield-freebsd@yahoo.com> writes:

> I activated my firewall "client" configuration on my desktop that uses dhcp for
> a cable modem.
> 
> Everything works fine (I even enabled ping), however, everytime I shutdown and
> restart the modem I find myself having to check /var/db/dhclient.leases.xl0 to
> edit /etc/rc.firewall to change $net and $ip.
> 
> Is there an easy way to automate this?

That's what the "me" keyword is for in the ipfw syntax.
Using this would require you to create a slightly customised version
of the firewall rules file.

Alternatively, you could have dhclient write the parameters out to a
file that the firewall script would read in.  dhclient-script(8) has
"hooks" for this.