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E-DOC-CTC-20051017-0151 v1.0
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™.