ZyXEL Communications P-334WT Technical Information download pdf (Page 59)

Setup the Prestige 334WT as a PPTP Client

● What is PPTP Client?

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.

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ZyXEL Communications P-334WT Technical Information Page 59