ZyXEL 802.11g Bedienungsanleitung PDF herunterladen (Seite 239)

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P-662H/HW-D Series User’s Guide

Chapter 16 VPN Screens 239

CHAPTER 16

VPN Screens

This chapter introduces the VPN screens. See the Logs chapter for information on viewing

logs and the appendix for IPSec log descriptions.

16.1 VPN/IPSec Overview

Use the screens documented in this chapter to configure rules for VPN connections and

manage VPN connections.

16.2 IPSec Algorithms

The ESP and AH protocols are necessary to create a Security Association (SA), the

foundation of an IPSec VPN. An SA is built from the authentication provided by the AH and

ESP protocols. The primary function of key management is to establish and maintain the SA

between systems. Once the SA is established, the transport of data may commence.

16.2.1 AH (Authentication Header) Protocol

AH protocol (RFC 2402) was designed for integrity, authentication, sequence integrity (replay

resistance), and non-repudiation but not for confidentiality, for which the ESP was designed.

In applications where confidentiality is not required or not sanctioned by government

encryption restrictions, an AH can be employed to ensure integrity. This type of

implementation does not protect the information from dissemination but will allow for

verification of the integrity of the information and authentication of the originator.

16.2.2 ESP (Encapsulating Security Payload) Protocol

The ESP protocol (RFC 2406) provides encryption as well as the services offered by AH. ESP

authenticating properties are limited compared to the AH due to the non-inclusion of the IP

header information during the authentication process. However, ESP is sufficient if only the

upper layer protocols need to be authenticated.

An added feature of the ESP is payload padding, which further protects communications by

concealing the size of the packet being transmitted.

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