RAS must be configured to access your private network using the appropriate network protocols in order to enable the PPTP server to forward a packet from a PPTP client to the correct destination computer. For more information about general RAS server configuration (for example, using TCP/IP, IPX, or NetBEUI), see Rassetup.hlp in the \Systemroot\System32 directory.
Once RAS is configured to access the private network, a PPTP server requires the following configuration:
· The TCP/IP protocol must be configured to enable IP forwarding.
· The default route on the private network (intranet) must be suppressed by adding a Registry entry.
· You must prevent RAS from changing source IP addresses of incoming packets.
· Static routes to the private network must be established.