Check and see if someone has written a webmin module for iptables.
Simon Garner wrote:
There is a Webmin module for Shorewall and a regular frontend for iptables which seems to work fine. Like all Webmin modules it's fairly slow to refresh and can make extensive rule changes pretty tedious. I generally ssh in and edit my script directly since it's faster and I can document the rule better, but that's just my choice.
Jeff