ZyXEL P-202H User Guide - Page 113
Encapsulation
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Figure 47 IPSec Architecture P-202H Plus v2 User's Guide 10.2.1 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 see Section 11.2 on page 116 for more information. 10.2.2 Key Management Key management allows you to determine whether to use IKE (ISAKMP) or manual key configuration in order to set up a VPN. 10.3 Encapsulation The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode. Chapter 10 Introduction to IPSec 112
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