Chapter 5

Expert Configuration

5.4.8 PPTP-to-PPP Relay

Overview The PPTP-to-PPP Relay, referred to as "Relay" further in this section, interacts with a PPTP tunnelling application installed on the locally attached computers, for example Microsoft's Dial-Up Networking.

A typical user-relay interaction scenario is as follows: A PPTP Tunnelling application is started on one of the locally attached computers. This application establishes a PPTP tunnel to the SpeedTouch™ and is the trigger for the Relay to come into action. The Relay chooses a free PPPoA phonebook entry and from then on relays all PPP frames sourced by the PPTP application from the tunnel to the virtual channel identified by the phonebook entry and vice versa. At the remote end of the virtual channel, the BRAS extracts the PPP frames, reconstructs the encapsulated IP packets and forwards these to the Internet.

If, at the end of a session, the user disconnects the PPTP application, it destroys the tunnel and the Relay subsequently releases the virtual channel.

Multiple users can initiate/terminate tunnels towards the Relay as long as there are free ATM virtual channels on the DSL Line. The maximum number of tunnels may however be restricted by DSL provider / ISP provisioning rules.

The SpeedTouch™ Relayed PPPoA page allows you to overview current active relay session, currently maintained by the SpeedTouch™.

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RCA 608WL, 620, 605 manual PPTP-to-PPP Relay