Allied Telesis AR450S Bedienungsanleitung PDF herunterladen (Seite 2)

Configure Microsoft® Windows XP** Virtual Private Network (VPN) client interoperability with NAT-T support 2

Typical network scenario

Figure 1: Typical network scenario

Consider the following typical network scenario:

You are the manager of a small business and you have purchased the AR450S for your small office

premises. You have five PCs networked together with a server in your office. You intend to use your

AR450S as your Internet gateway and for it to provide firewall protection.

You also have a team of five sales people who travel widely around the globe. You would like these

staff members to have secure (encrypted) remote access through the Internet to the servers in your

office—allowing them to access files, private Intranet and business email.

The travelling staff members will get secure remote access from any hotel or location with Internet

access through the use of IPSec VPN. Each staff member has a laptop or other portable device with

Windows XP or Windows 2000 installed.

This document describes how to configure the Windows system to use IPSec VPN to connect your

travelling staff laptops to your AR450S router. Through the use of NAT-T technology, your IPsec VPN

will still work even if the remote location or your small office uses a NATing gateway or firewall for

Internet access.

When your travelling staff want to connect to the office they simply use the VPN icon on their desktop

to initiate the IPSec VPN connection.

NAT-T1

Interconnect

LAN address

Fixed Internet

address

Internet

address

Access device

Office

private

LAN

Remote

private

LAN

Optional NAT gateway with

pinholes for UDP 500 and 4500

Optional NAT gateway

Office

PCs

Intranet

server

Private DNS

server if

applicable

VPN gateway

(responder)

VPN clients

(initiators)

Internet

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