Is there a firewall that reads rules directly using iptables?

Is there a firewall that reads rules directly using iptables?

[Clay Amerault]

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Hello.
 
I've downloaded and played with a few firewalls like fwbuilder and
firestarter.  It seems like these firewalls and all the others I've
found keep their own ruleset in a data store and then use that ruleset
to create iptables commands, and then blow away whatever rules are in
netfilter already and load the ruleset they create.
 
Are there any firewalls that read the netfilter rules using iptables and
don't have any intermediate storage of their own rules.  I'd like a
firewall that was aware of any changes made to netfilter rules if a
program external to it issued an iptables command to change the rules,
and then allowed you to manage that.
 
Thanks for your help.

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