ZyXEL P-2602HW-D3A User Guide - Page 217
Encapsulation
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Figure 118 IPSec Architecture P-2602H(W)(L)-DxA Series User's Guide 16.2.1 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 seeSection 17.2 on page 221for more information. 16.2.2 Key Management Key management allows you to determine whether to use IKE (ISAKMP) or manual key configuration in order to set up a VPN. 16.3 Encapsulation The two modes of operation for IPSec VPNs are Transport mode and Tunnel mode. Chapter 16 Introduction to IPSec 217
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