VPN connection through firewall

Hi,

I have a DFL-500 firewall from D-link and just managed to set up a VPN connection with PPTP. The connection was made from an external computer with Win2000 on it. I managed to connect and loggin. The status says that the connection is made. When I ping to a computer that is located on the inside of the firewall, it is succesfull. But now I’m trying to see any shared folders but I cannot seem to find them nor the computer. Can anyone help?