make you enable IP routing. This troubleshooting may help,

routing issues on vpn Can ping VPN server only but not other resources Can't access the internal server when remote client establishes VPN Can't access the Internet while using ...
     www.chicagotech.net/routingissuesonvpn.htm  

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net 
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com 
 Hi all,

 I'm able to connect to my office remotely, but can't access any of the
 network resources. Here's a run down of my configuration at the office.

 Router External - 64.x.x.x
 Router Internal - 192.168.2.1
 Win2K3/VPN Server - 192.168.2.2
 Desktop - 192.168.2.53

 Once I connect, I'm able to ping my desktop at home from the server,
 but I'm not able to ping the server or any device from my remote
 connection.

 Can someone please give this noob some guidance. I appreciate it.