Prestige 334 User’s Guide
Chapter 14 Introduction to IPSec
152
Figure 57
IPSec Architecture
14.2.1 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
for more information.
14.2.2 Key Management
Key management allows you to determine whether to use IKE (ISAKMP) or manual key
configuration in order to set up a VPN.
14.3 Encapsulation
The two modes of operation for IPSec VPNs are
Transport
mode and
Tunnel
mode.
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