Netgear ADSL Firewall Router DG834 User Manual download pdf (Page 194)

Reference Manual for the ADSL Firewall Router DG834

D-6 Virtual Private Networking

202-10005-05, June 2005

Key Management

IPSec uses the Internet Key Exchange (IKE) protocol to facilitate and automate the SA setup and

the exchange of keys between parties transferring data. Using keys ensures that only the sender

and receiver of a message can access it.

IPSec requires that keys be re-created, or refreshed, frequently so that the parties can communicate

securely with each other. IKE manages the process of refreshing keys; however, a user can control

the key strength and the refresh frequency. Refreshing keys on a regular basis ensures data

confidentiality between sender and receiver.

Understand the Process Before You Begin

This document provides case studies on how to configure secure IPSec VPN tunnels. This

document assumes the reader has a working knowledge of NETGEAR management systems.

NETGEAR is a member of the VPN Consortium, a group formed to facilitate IPSec VPN vendor

interoperability. The VPN Consortium has developed specific scenarios to aid system

administrators in the often confusing process of connecting two different vendor implementations

of the IPSec standard. The case studies in this TechNote follow the addressing and configuration

mechanics defined by the VPN Consortium. Additional information regarding inter-vendor

interoperability may be found at http://www.vpnc.org/interop.html.

It is a good idea to gather all the necessary information required to establish a VPN before you

begin the configuration process. You should understand whether the firmware is up to date, all of

the addresses that will be necessary, and all of the parameters that need to be set on both sides. Try

to understand any incompatibilities before you begin, so that you minimize any potential

complications which may arise from normal firewall or WAN processes.

If you are not a full-time system administrator, it is a good idea to familiarize yourself with the

mechanics of a VPN. The brief description in this TechNote will help. Other good sources include:

• The NETGEAR VPN Tutorial – http://www.netgear.com/planetvpn/pvpn_2.html

• The VPN Consortium – http://www.vpnc.org/

• The VPN bibliography in “Additional Reading“ on page D-11.

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Netgear ADSL Firewall Router DG834 User Manual Page 194