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Originally Posted by SAC
The firewall has multiple IP addresses allocated to the network card and we will be putting public facing machines on the DMZ with private addresses and the relevant ports forwarded. The auto registration process will only allow us to allocate one of the IP addresses to the MAC of the firewall.
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That's a serious problem for you. Have you exhausted all possible negotiations with NTL to allow multiple IPs on your single external interface?
A completely different approach would be to have a different style of firewall: one which is transparent to IP, and works at Layer 2 by sniffing the passing traffic and diverting it as necessary. Then your five public machines could have their real NTL IP addresses.