VPN through my ISP

I am able to connect to my ISP and then use DUN to connect to my network. However after authentication takes place and I am connected, I am not able to see the domain resources (basically the entire LAN is not accessible.) What do I need to check for?
The Remote access admin tool says that I am connected.

I have:
Windows 98 SE
Dial Up Adapter #2 VPN
MS VPN Adapter
TCP/IP and NetBEUI