Virtualising An ISA-Server under Hyper-V

I am looking to virtualise our ISA Server 2000 Enterprise machine which handles our
incoming VPN connections via a Netgear DGN-834GT router.

Our current physical ISA server has two network cards installed, one for the LAN and
one for the WAN. I am looking at de-comissioning this machine
and moving its function over to a more powerful Hyper-V server and virtualise it.

The current physical machine's network adapters are set up as follows....

      Local Area Connection 1 (LAN)
            IP: 192.168.0.53
            Sub: 255.255.255.0
            Gateway: <blank>
            DNS1: 192.168.0.21


      Local Area Connection 2 (WAN)
            IP: 87.xxx.101.58
            Subnet: 255.255.255.248
            Gateway: 87.xxx.101.57

            DNS1: 217.13.128.17
            DNS2: 83.218.143.36

                  
Our Hyper-V machine also has two network adapters installed (one for the LAN
and the other for the WAN).

I am confortable setting up the LAN adapter with a Virtual Network Adapter under Hyper-V, however
I am not sure how to set up the WAN adapter under Hyper-V.

I'm presuming that the second adapter on the physical machine will need to be physically connected
to the WAN router as is the current physical ISA Server machine, however what IP setup do I put on the new physical Hyper-V machine for the WAN adapter and then how do I make this available under Hyper-V, do I set up a second virtual network under Hyper-V ? On the virtual machine for the ISA server what IP settings do I need to set for the second virtual network adapter, the same as the physical ones and the same as the current Physical ISA Server's WAN settings ? If they're the same won't it mess things up ?