Lancom Systems LCOS 3.50 14 Virtual Private NetworksVPN

 Chapter 14: Virtual Private Networks—VPN LANCOM Reference Manual LCOS 3.50

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Virtual Private Networks—

VPN

14 Virtual Private Networks—VPN

A VPN (Virtual Private Network can be used to set up cost-effective, public IP

networks, for example via the Internet.

While this may sound unspectacular at first, in practice it has profound effects.

To illustrate this, let's first look at a typical corporate network without VPN

technology. In the second step, we will see how this network can be optimized

by the deployment of VPN.

Conventional network infrastructure

First, let's have a look at a typical network structure that can be found in this

form or similar forms in many companies:

The corporate network is based on the internal network (LAN) in the

headquarters. This LAN is connected to the outside world in three ways:

A subsidiary is connected to the LAN, typically using a leased line.

PCs dial into the central network via modem or ISDN connections (Remote

Access Service – RAS).

Headquarters

Computers

using remote

access, e.g.

home working

Internet



LAN

Branch office

ISDN ISDN

