The previous section describes how a PPTP-enabled dial-up client establishes a PPTP tunnel with a PPTP server. Dial-up clients that are not PPTP-enabled can also take advantage of PPTP by connecting to a PPTP-enabled network access server. The network access server then establishes the PPTP connection to a PPTP server.
In this scenario, the dial-up client can be a Windows 95-based, Windows NT-based, Apple Macintosh, or UNIX client. The architecture described in this document is fundamentally the same; however, all PPTP communication occurs between the network access server and the PPTP server.
PPTP-enabled ISP network access servers are designed and built to accommodate a high number of dial-in clients. Such network access servers are built by companies such as 3Com, Ascend Communications, ECI Telematics, and U.S. Robotics, all members of the PPTP Forum.
Contact your ISP to see if they provide a PPTP service and how you need to configure PPP and Dial-Up Networking to access the ISP server that supports PPTP.