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WR3000 4-Port Wireless DSL/Cable Router
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Appendix D
PPTP
What is PPTP?
PPTP (Point-to-Point Tunneling Protocol) is a Microsoft proprietary protocol (RFC 2637 for
PPTP is informational only) to tunnel PPP frames.
How can we transport PPP frames from a PC to a broadband modem over Ethernet?
A solution is to build PPTP into the ANT (ADSL Network Termination) where PPTP is used
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. The drawback of this solution is that it requires
one separate ATM VC per destination.
PPTP and the WR3000 Wireless Router
When the WR3000 Wireless Router is deployed in such a setup, it appears as a PC to the
ANT. In Windows VPN or PPTP Pass-Through feature, the PPTP tunneling is created from
Windows 95,98 and NT clients to an NT server in a remote location.
The pass-through feature allows users on the network to access a different remote server
using the WR3000 Wireless Router’s Internet connection. In NAT mode, the WR3000
Wireless Router is able to pass the PPTP packets to the internal PPTP server (i.e. NT server)
behind the NAT. Users need to forward PPTP packets to port 1723 by confi guring the server
in Menu 15.2 - Server Set Setup.
In the case above as the remote PPTP Client initializes the PPTP connection, the user must
confi gure the PPTP clients. The WR3000 Wireless Router initializes the PPTP connection
hence; there is no need to confi gure the remote PPTP clients.