PPTP Overview
Point-to-Point Tunneling Protocol (PPTP) is an L2 tunneling protocol developed by Microsoft for a Windows-enabled remote client to connect securely to a private corporate network over the public IP network. PPTP is a newer technology and is somewhat of a replacement for VPDN. Unlike in the traditional VPDN architecture, the PPTP client doesn't have to be connected over the dialup services. This is because as far as PPTP is concerned, the client's PC is the PPTP access concentrator (PAC), and the other side of the connection terminates at the PPTP network server (PNS), which is the PIX Firewall. The PIX Firewall has supported PPTP since Release 5.1. PIX's support of PPTP includes PAP, CHAP, and MS-CHAP using local, RADIUS, or TACACS+ ...
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