Use Proxy Arp.
From: Thomas Hertz [mailto:term at cynisk dot net]
Sent: Friday, August 20, 2004 2:34 AM
To: m0n0wall at lists dot m0n0 dot ch
Subject: [m0n0wall] Several dynamic IPs on WAN?
I'm in the process of changing my ISP from DSL with one static IP to 100mbps
Ethernet with five dynamic, DHCP assigned, addresses. I'm not quite sure how
this would work, but does anyone know of a way to assign more than one IP to
the same physical interface? It would be neat to use 1:1 NAT.