Prestige 2302RL Support Notes
All contents copyright (c) 2007 ZyXEL Communications Corporation.
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Using PPTP encapsulation on Prestige
What is PPTP Client? 0
Microsoft's Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables the secure transfer of
data from a remote client to a private enterprise server by creating a VPN across TCP/IP network. PPTP
supports on-demand, multi-protocol, virtual private networking over public networks, such as the Internet.
This implementation of PPTP client is specifically for the French market where Alcatel's ANT (ADSL Network
Termination) is deployed. Most, if not all, broadband modems (ADSL and cable modem) are equipped with
Ethernet instead of RS-232 because RS-232 is too slow. It is therefore impossible to use them in the same way
as the traditional analog modem and ISDN TA. A mechanism is needed to transport the PPP frames from a PC
to the broadband modem over Ethernet. Before PPPoE was formalized, Alcatel came up with the idea of
building PPTP into their ANT for this purpose.
Instead of using the Internet to transport PPP frames anywhere in the world as originally envisioned, Alcatel's
solution uses PPTP only over the short haul between the PC and the modem over Ethernet. For the rest of the
connection, the PPP frames are transported with PPP over AAL5 (RFC 2364). The PPP connection, however, is
still between the PC and the ISP.
The various connections in this setup are depicted in the following diagram.
