Ipsec Algorithms; Key Management; Encapsulation; Figure 112 Ipsec Architecture - ZyXEL Communications ZyWall 35 User Manual

Figure 112 IPSec Architecture

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), AES (Advanced 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

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.
Chapter 13 Introduction to IPSec
for more information.
ZyWALL 35 User's Guide
see the IPSec
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