Give 1811 wan interface multiple mac addresses

[LingaringBell]

I have a cisco 1811 connected to a wideband modem. I purchased a block of public IP addresses from for some web servers on site. So I go to set it up using reverse nat like I normally would and nothing works. Turns out that on the ISPs side everything is operating at Layer 2, so the public IP addresses have to be associated with a MAC address. My solution for this is to assign multiple IP addresses to the WAN port on the 1811, but I can't find a way to do it. Is it possible? Does anyone have any other ideas? Thanks.
-Bell

 

[LingaringBell]

Oops, I realized I had a typo here. What I should say is, I want to assign multiple MAC addresses to the WAN port (or a VLAN interface).

 

[Quadratic]

You could create a series of subinterfaces, giving each an IP and hard-coded mac address. I believe subint config command "mac-address aaaa.aaaa.aaaa" should work for that.

CCNP, CCDP

 

[LingaringBell]

It doesn't look to me like you can give a subinterface a mac address, the "mac-address" command is not listed as a possible command.