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Chapter 10 VPN
Chapter 9 VPN
The Gigabit Router supports PPTP client feature. PPTP is a VPN tunneling protocol which
encapsulates PPP frames in IP packets for transmission over a public IP network such as
the Internet. PPTP is based on client/server model. The PPTP client initiates a PPTP
connection to the server, while the PPTP server accepts the incoming PPTP connection
from the client. PPTP is often used to implement remote access VPNs over an IP network
(such as a broadband network), to extend the reach of your Intranet.
9.1 Introduction to PPTP Implementation
PPTP is used to encapsulate PPP frames in IP packets for transmission over a public IP
network such as the Internet. The PPTP client or server encapsulates the original user
packets inside PPP frames before sending them through a PPTP tunnel over the Internet;
while the peer performs decapsulation firstly, and then forward the original packets to their
intended destinations.
As shown in Figure 9-1, the typical application of PPTP is that some laptop or desktop
computers act as the PPTP client devices, that is, some employees in the remote branch
offices or mobile users (traveling employees, telecommuters, etc.) use the Windows
built-in PPTP client software to initiate PPTP connections; the PPTP server deployed at
the head office accepts the PPTP incoming connections from the clients. After a PPTP
tunnel has been established between the PPTP client and server, the PPTP server will
receive the PPTP packets from the client firstly, and then perform decapsulation, lastly
forward the original packets to their intended destinations.
Figure 9-1 Typical Application of PPTP
