ZyXEL P-2802HWL-I3 User Guide - Page 181
Encapsulation
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Figure 104 IPSec Architecture Chapter 13 Introduction to IPSec 13.2.1 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 seeSection 14.2 on page 185for more information. 13.2.2 Key Management Key management allows you to determine whether to use IKE (ISAKMP) or manual key configuration in order to set up a VPN. 13.3 Encapsulation The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode. P-2802H(W)(L)-I Series User's Guide 181
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