ZyXEL VMG8324 User Guide - Page 229
Encapsulation
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Figure 139 IPSec Architecture Chapter 20 VPN 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. Key Management Key management allows you to determine whether to use IKE (ISAKMP) or manual key configuration in order to set up a VPN. 20.5.2 Encapsulation The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode. At the time of writing, the Device supports Tunnel mode only. Figure 140 Transport and Tunnel Mode IPSec Encapsulation VMG8324-B10A / VMG8324-B30A Series User's Guide 229