Locating a computer

This is kind of long, but please help. We just recently upgraded a dedicated WAN link to a DSL 6Mbps link. The difference is that now we do not have a router in the link. The 2 networks are now directly connected instead of going through a router. Now, our 2 Novell servers which were on the same side of the router are displaying the "Router Configuration Error Detected. Node <node address> claims network address <address1> should be <address2>." for 3 different node addresses. I know what this error means and I know how to bind and unbind, but no combination of the 2 addresses listed on the 2 servers will make it stop. All I really have to go on are the 3 node address that are broadcasting this error message. Is there anyway to find out a computer name via the MAC address if the computer is only running IPX? We know of no other Novell servers or printers on the network but obviously there are. Any ideas on how to find them? Thanks a bunch.

It's a shot in the dark, but could you ping one server from the other?