ZyXEL P-330W User Guide - Page 102
Appendix B
View all ZyXEL P-330W manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 102 highlights
ZyXEL P-330W User's Guide Appendix B 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 computer 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 computer 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 computer 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. Figure 67 Transport PPP frames over Ethernet PPTP and the P-330W When the P-330W is deployed in such a setup, it appears as a computer 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 P-330W's Internet connection. In SUA/NAT mode, the P-330W is able to pass the PPTP packets to the internal PPTP server (i.e. NT server) behind the NAT. You need to configure port forwarding for port 1723 to have the P-330W forward PPTP packets to the server. In the case above as the remote PPTP Client initializes the PPTP connection, the user must configure the PPTP clients. The P330W initializes the PPTP connection hence; there is no need to configure the remote PPTP clients. Appendix B PPTP 102