iptables question

[Gordon Messmer]

The file you'll want to modify is /etc/sysconfig/iptables.  Others have 
already posted the appropriate rules.  Make sure you have backups; if 
you ever run the system-config-security tool again, it'll over write 
your changes.

You could go one level up that stack and modify 
/etc/sysconfig/system-config-firewall, but I don't know where the 
documentation for that is located...