pf and dynamic ip addresses

[Sebastian Stark <seb_(_at_)_todesplanet_(_dot_)_de>]

For those who are interested, I made a setup for using pf with dynamic
ip addresses. I post it here and hope some people help me improving it
(or tell me why it is complete bullshit). I do this because I didn't
find any information about pf and dynamic ip addresses.

/etc/ppp/ppp.linkup:
====================

MYADDR:
 ! /etc/ppp/ed_nat.conf MYADDR
 ! /sbin/pfctl -F nat -N /etc/nat.conf
 ! /sbin/pfctl -F rules -R /etc/pf.conf
     
/etc/ppp/ed_nat.conf:
=====================

#!/bin/sh
cp /etc/nat.conf /etc/nat.conf.last
ed - /etc/nat.conf << EOD
/nat on tun0/,s/-> [^ ]* /-> $1 /
w
q
EOD

/etc/nat.conf:
==============

nat on tun0 from 192.168.1.0/24 to any -> 217.0.101.233


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