I have about to replace my linux op-masq, firewall (as I have previously posted).

IP-NAT:
I found this howto for setting up the ip-nat.  It is for 1.3.1.  Is anything different for this
howto, than for 1.5.2?  Anyone know of a better howto?

FIREWALL:
Anyone know of a script to serve as a base for setting up a firewall?  Or a howto?  I don't need
anything fancy for now.  I can edit a script to meet my needs.

~S