Firewall/NAT

I own multiple WAN subnets and I would like to add a couple of IPs to my WAN interface that are in a different subnet than my main firewall WAN IP.

I would assume that I would have to enter static routes both at my internet router and at my m0n0wall.

Has anyone done this? Is there an easier way?

I was wanting to do this as well - I ended up using NAT 1:1 and just manually mapping WAN addresses across to local LAN IP's. It works well but it's not the ideal solution (specially if you have a large subnet to add..).

I could not find any documentation in how to do that apart from this, but it didn't really step through it:

http://doc.m0n0.ch/handbook/faq-ipalias.html

Forgot to reply with my solution, but yes. Adding the IP from a different network to the Proxy Arp does work. Thanks.