Reserve a single ip for a wired and wireless NIC of the same machine

I'm using w2k3 dhcp server, and I've reserved an IP adress for my laptop to facilitate port forwarding. I previously had a pure wired network, but I just added a WiFi router to this network for the obvious benefits of wireless, but I want to keep using the wired network in case I need more speed than the wireless part can deliver.

Of course I forgot that the wireless card of my laptop has it's own MAC address, and when I connect over WiFi to my network I get a different (from the reserved one) IP address. This is a problem because I can configure my port forwarding only for ip-addresses, not hostnames. So I absolutely need to have the same IP address given to my laptop by dhcp wether I'm using WiFi or a wired connection.

The big problem is that the DHCP server on w2k3 doesn't allow me to configure the same IP address for a different MAC.

Any thoughts on this?

You might be able to "clone" the wired NIC's MAC onto the wireless NIC. A fair number of NICs have drivers that expose this functionality under its "Advanced" tab for the NIC driver properties.

Just keep in mind, as with the DHCP reservation approach, you need to take care to not have both NICs on the LAN at the same time. With the duplicate MACs approach, it may cause more disruptive effects at the network switching level vs. a limited duplicate IP shutdown of the "offending" devices/hosts.