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Chapter 5
Expert Configuration
E-DOC-CTC-20050429-0104 v1.0
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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 tunneling 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™.