Encapsulation; Figure 15-2 Ipsec Architecture; Figure 15-3 Transport And Tunnel Mode Ipsec Encapsulation; Ipsec Algorithms - ZyXEL Communications Prestige 662HW Series User Manual
802.11g wireless adsl 2+ 4 port security gateway
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Prestige 662HW Series User's Guide
Figure 15-2 IPSec Architecture
15.2.1 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 see section 16.2 for more
information.
15.2.2 Key Management
Key management allows you to determine whether to use IKE (ISAKMP) or manual key configuration
in order to set up a VPN.
15.3 Encapsulation
The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode.
Figure 15-3 Transport and Tunnel Mode IPSec Encapsulation
Introduction to IPSec
15-3
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