Site to site without VPN

Hi All!
I’d like some tips on how to link two sites so that a Windows 2k domain can span the environment. DC is a Win2k advanced server with a Citrix box running a legacy app. Citrix is the key applicaication on both ends. I’d like to do this with Fixed IP DSL modems and a linksys router on each end. I also have another server I can use as a DC on the remote end.