IPCHAINS Firewall script for MOHAA Linux Server?

[Norm Dressler]

Anyone have a good firewall script for MOHAA linux server?  I know if I
allow all inbound the server works great but I would prefer to declare the
specific ports the server needs rather then open things right up.
I found this so far:
http://www.mohadmin.com/nuke/modules.php?name=Content&pa=showpage&pid=13

But its not specific to ipchains and in fact you need both tcp and udp for
ports 12200 to 12300.

Thanks
Norm