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[Acronym] for Point-to-Point Tunneling Protocol

A technology for creating Virtual Private Networks (VPNs) , developed jointly by MicrosoftCorporation, U.S. Robotics, and several remote access vendor companies, known collectively as the [PPTP] Forum. A [VPN] is a private network of computers that uses the public Internet to connect some nodes. Because the Internet is essentially an open network, the Point-to-Point Tunneling Protocol ([PPTP]) is used to ensure that messages transmitted from one VPN node to another are "secure". With [PPTP], users can dial in to their corporate network via the Internet.

If you want to support this under Linux, get [PoPToP|http://www.poptop.org/].  It starts a pppd in the correct place; you might be interested in the [MPPE] patches.

For firewalling interests. PPTP uses GRE packets and a TCP connection on port 1723 for control. Most firewall/nat implementations don't understand the GRE connection identifier and thus will only support one PPTP tunnel to a single PPTP server when your connection is over NAT. ''Someone should make this more correct''

15 pages link to PPTP:

Version 4, saved on Tuesday, April 1, 2003 3:23:53 pm by PhilMurray

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