ZyXEL LTE5121 User Guide - Page 156
IPSec Architecture, Encapsulation
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Chapter 16 VPN 16.5.1 IPSec Architecture The overall IPSec architecture is shown as follows. Figure 106 IPSec Architecture 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. 16.5.2 Encapsulation The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode. At the time of writing, the LTE Device supports Tunnel mode only. 156 LTE-5121 User's Guide