Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 525)

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Networking Configuration Guide

Appendix A

VPN overview

A VPN (Virtual Private Network) is a group of systems connected across various data-transfer

technologies that form a secure and private network.

BCM uses the Internet and tunneling protocols to create secure VPNs. These secure extranets

require a protocol for safe transport from the BCM to another device through the Public Data

Network (PDN). BCM uses the IPSec tunneling protocols.

Extranets can connect:

• mobile users to a fixed private network at their office over the PDN

• private networks in the two branch offices of the same corporation over PDN

• two divisions of the same corporation over the corporate intranet

When connecting two branch offices, the use of a VPN over the public data network is very

efficient if the connection is required only intermittently or a dedicated point-to-point link is

considered too expensive. Also, with the advent of business-to-business solutions, VPNs can be

deployed to provide secure connections between corporations.

IPSec tunnels

In the IPSec Specification, there are two tunnel modes defined: tunnel mode and transport mode.

BCM supports only tunnel mode. Tunnel mode describes a method of packetizing TCP/IP traffic

to create a virtual tunnel.

Tunnels are created between servers, which are also known as gateways. This is called a Branch

Office Connection. The end nodes connect to each other through gateways. These gateways set up

the tunnel over the PDN on behalf of the end nodes. The establishment of the tunnel, and the PDN

in between, is transparent to the end nodes which behave as if they are interacting through a router.

Typically, the edge devices connecting the branches of a corporation to the ISP use VPN in this

mode.

BCM is compatible with the Nortel Services Edge Router (formerly known as Shasta 5000) and

the following versions of the Contivity VPN Client:

• V_05_01

• V_05_11

• V_06_01

• V_06_02

• V_07_01

The following describes configuring the tunnel portion of BCM using IPSec.

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