Chapter 3. Troubleshooting Point-to-Point Tunneling Protocol VPNs
The Point-to-Point Tunneling Protocol (PPTP) is described in RFC 2637 and allows the tunneling of Point-to-Point Protocol (PPP) frames across an IP backbone from a PPTP Access Concentrator (PAC) to a PPTP Network Server (PNS). PPTP was the result of work carried out by a consortium of vendors, the most prominent of which was Microsoft.
RFC 2637 describes how PPTP separates the functionality of the traditional Network Access Server (NAS). The PAC is responsible for remote access client call termination, Link Control Protocol (LCP) termination, and possibly PPP authentication. The PNS is responsible for PPP authentication, Multilink PPP (MP) channel aggregation, and Network Control ...
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