Ppp To Pptp Relaying - Alcatel speed touch home Advanced User's Manual

14 Advanced Networking Concepts
14.4.3

PPP to PPTP Relaying

INTERNET
Remote LAN
Figure 78 Network Protocol Architecture
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By double clicking dial up icons, PPTP tunnels are established
between the Speed Touch Home and PCs on your LAN.
Simultaneously, PPP sessions are established with remote
destinations.
The STHome relays all PPP traffic inside PPTP tunnels to ATM
virtual channels. In this way it is as if ATM virtual channels are
extended to your PC(s).
The figure below provides an overview of the end to end
architecture. In the figures only two tunnels are shown, but in
reality there could be several.
ISP Access Point
Atm Network
Bundled ATM Channels
Corporate Access Point
PPTP tunneling is based on the IP protocol. Consequently, IP
connectivity must exist between your PCs and the STHome prior to
establish local tunnels. Configuration of the STHome IP functions
is explained in Chapter 9.
Various platforms support PPTP . However, subsequent examples
will be given for Windows 95, Windows 98 and Windows NT only.
Other OSs will have similar behaviour and it is left to the user to
apply the explanation to the specific environment.
PPTP might not always be included with your OS. However, there
are third party PPTP clients commercially available for your OS,
e.g. Tunnelbuilder from Network TeleSystems Inc. (www.nts.com).
Local PPTP
Tunnels
Ethernet LAN
PPP RELAY
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