Ipsec Algorithms; Key Management; Encapsulation; Figure 95 Ipsec Architecture - ZyXEL Communications P-335WT User Manual

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16.2.1 IPSec Algorithms

The ESP (Encapsulating Security Payload) Protocol (RFC 2406) and AH (Authentication

Header) protocol (RFC 2402) describe the packet formats and the default standards for packet

structure (including implementation algorithms).

The Encryption Algorithm describes the use of encryption techniques such as DES (Data

Encryption Standard) and Triple DES algorithms.

The Authentication Algorithms, HMAC-MD5 (RFC 2403) and HMAC-SHA-1 (RFC 2404,

provide an authentication mechanism for the AH and ESP protocols. Please

Algorithms section

Key management allows you to determine whether to use IKE (ISAKMP) or manual key

configuration in order to set up a VPN.

The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode.

Chapter 16 Introduction to IPSec

for more information.

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