VPN’s

We have recently set up a NT 4.0 server for VPN connections. We have been able to connect to the server, get authenticated and recognized by the domain, but then can only see the box we connect to, no other resources on the network are available. We have been connecting with Windows 98 and 2000. Again both connect to the domain with no problems, but we cannot see resources on the network. What are we doing wrong?