Windows 2000 Server w/mediaone & router

I need to know how to get a windows 2000
server running with my cable internet with a linksys router. I setup the server and active directory but my other win2k workstation won’t detect the domain on the network. I setup both systems with fixed IPaddresses. Does anyone here know the steps to getting this to work? The router is set on DHCP. I want 2 workstations to logon to the server.. Any help would be appreciated.

Pctech1