IPTABLES and DHCP

["Randolph S. Kahle" <RandyKahle@KahleAssociates.com>]

I am configuring a firewall that will run dhcpcd on eth0 (it is
connected to a cable modem).

I have a firewall rule set (for IPTABLES) that is working on another
machine with a fixed IP for eth0

In the rule set I have statements such as

IF_INTERNET="eth0"
IP_INTERNET="24.27.45.111"


I use the $IP_INTERNET value in

$IPTABLES -t nat -A POSTROUTING -o $IF_INTERNET -j SNAT --to-source
$IP_INTERNET

to give me my NAT translation.

My question is this --> How do I synchronize the IP address for eth0
that dhcpcd secures with the rule in iptables?

It seems to me that I need to run some script or take some action each
time dhcpcd secures a new IP address.

Thanks!

-- Randy