[TriLUG] dhclient and iptables

[BSmith]

I'm currently running Debian and I'm in the process of setting up iptables. 
I seem to have run into a little problem, however. I would like to be able 
to use my IP address in my rule set, but since my IP address is dished out 
by a DHCP server every time I receive a new lease my old rule set is moot. 
I was searching around for a bit and noticed that there is an option with 
the pump DHCP client to execute a script anytime the client receives a new 
DHCP lease. Is there a way to do something similar with dhclient or is 
there another possible work around?

Thanks for the help.