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VPN
1. Introduction to VPNs and Remote Access
A virtual private network (VPN) is the extension of a private
network that encompasses links across shared or public networks
like the Internet. A VPN enables you to send data between two
computers across a shared or public internetwork in a manner
that emulates the properties of a point-to-point private link.
There are two types of VPN connections: the remote dial-in
access VPN connection and the LAN-to-LAN VPN connection.
The first, " Remote Dial-In Access " means the router allows a
remote access node, a NAT router or a single user computer, to
dial into a VPN router through the Internet to access the network
resources of the remote network. The second, "LAN-to-LAN
Access " provides a solution to connect two independent LANs
for mutual sharing of network resources. For example, the head
office network can access the branch office network, and vice
versa.
Virtual private networking (VPN) supports Internet-industry
standards technology to provide customers with open
interoperable VPN solutions such as Internet Protocol Security
(IPSec) and Layer 2 Tunneling Protocol (L2TP) as well as Point-
to-Point Tunneling Protocol (PPTP).
VPN-4
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