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Chapter 10
10 6
Set up a VPN Connection
VPN (Virtual Private Network) is a private network established across 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 provides a secure
communication to a remote computer or remote network, and guarantee a secured
data exchange. IPSec is one of the major implementations of VPNs.
I want to:
How can I
do that?
Establish an IPSec VPN tunnel to connect two LANs via Internet so
that the hosts in different remote LANs are able to communicate
with each other as if they are in the same LAN.
For
example, I am the network administrator of a regional office,
I need to let my office staff visit the headquarter's servers and
resources, and vice versa. I know that the router in my office and
the device in headquarter both support IPSec VPN feature, so I
decide to set up a VPN connection with the headquarter office.
The following diagram is a typical VPN topology. Here Site A
refers to regional office's network (local network). And Site B
refers to the headquarter's network (remote network) which I
want to connect.
Site A
WAN: 219.134.112.246
GPON router 1
LAN: 192.168.1.1
Subnetmask: 255.255.255.0
PC 1
1 Make sure of the topology you want to build and record site
A (local network) and site B (remote network)'s LAN IP and
WAN IP.
2 Configuration on site A (local network).
Site B
GPON Router 2
WAN: 219.134.112.247
LAN: 192.168.2.1
Subnetmask: 255.255.255.0
PC 2
53
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