Gigarouter
UF72N User Manual
Page 51 of 203
3.4.7 VPN
VPN (Virtual Private Network)
is a private network established via the public network, generally via the
Internet. However, the private network is a logical network without any physical network lines, so it is
called Virtual Private Network.
With the wide application of the Internet, more and more data are needed to be shared through the
Internet. Connecting the local network to the Internet directly, though can allow the data exchange, will
cause the private data to be exposed to all the users on the Internet. The VPN (Virtual Private Network)
technology is developed and used to establish the private network through the public network, which can
guarantee a secured data exchange.
VPN adopts the tunneling technology to establish a private connection between two endpoints. It is a
connection secured by encrypting the data and using point-to-point authentication. The following
diagram is a typical VPN topology.
Figure 3-72 VPN – Network Topology
As the packets are encapsulated and de-encapsulated in the Router, the tunneling topology
implemented by encapsulating packets is transparent to users. The tunneling protocols supported
contain Layer 3 IPSEC and Layer 2 L2TP/PPTP.
3.4.7.2 PPTP Server
Layer 2 VPN tunneling protocol consists of L2TP (Layer 2 Tunneling Protocol) and PPTP (Point to Point
Tunneling Protocol).Both L2TP and PPTP encapsulate packet and add extra header to the packet by
using PPP (Point to Point Protocol).
Table depicts the difference between L2TP and PPTP.
Protocol
Media
Tunnel
Length of Header
Authentication
PPTP
IP network
Single tunnel
6 bytes at least
Not supported
L2TP
IP network of UDP
Multiple tunnels 4 bytes at least
Supported
Figure 3-73 Difference between L2TP and PPTP
Choose the menu
Data Service
→
VPN
→
PPTP Server
to load the following page.
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