Netgear ADSL Firewall Router DG834 User Manual download pdf (Page 190)

Reference Manual for the ADSL Firewall Router DG834

D-2 Virtual Private Networking

202-10005-05, June 2005

• Remote Access: Remote access enables telecommuters and mobile workers to access e-mail

and business applications. A dial-up connection to an organization’s modem pool is one

method of access for remote workers, but is expensive because the organization must pay the

associated long distance telephone and service costs. Remote access VPNs greatly reduce

expenses by enabling mobile workers to dial a local Internet connection and then set up a

secure IPSec-based VPN communications to their organization.

• Extranets: Extranets are secure connections between two or more organizations. Common

uses for extranets include supply-chain management, development partnerships, and

subscription services. These undertakings can be difficult using legacy network technologies

due to connection costs, time delays, and access availability. IPSec-based VPNs are ideal for

extranet connections. IPSec-capable devices can be quickly and inexpensively installed on

existing Internet connections.

What Is IPSec and How Does It Work?

IPSec is an Internet Engineering Task Force (IETF) standard suite of protocols that provides data

authentication, integrity, and confidentiality as data is transferred between communication points

across IP networks. IPSec provides data security at the IP packet level. A packet is a data bundle

that is organized for transmission across a network, and includes a header and payload (the data in

the packet). IPSec emerged as a viable network security standard because enterprises wanted to

ensure that data could be securely transmitted over the Internet. IPSec protects against possible

security exposures by protecting data while in while in transit.

IPSec Security Features

IPSec is the most secure method commercially available for connecting network sites. IPSec was

designed to provide the following security features when transferring packets across networks:

• Authentication: Verifies that the packet received is actually from the claimed sender.

• Integrity: Ensures that the contents of the packet did not change in transit.

• Confidentiality: Conceals the message content through encryption.

IPSec Components

IPSec contains the following elements:

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Netgear ADSL Firewall Router DG834 User Manual Page 190