ZyXEL 2WG 사용자 가이드

Chapter 15 IPSec VPN Screens

ZyWALL 2WG User’s Guide

In the web configurator, click SECURITY > VPN > SA Monitor. Use this screen to display 
and manage active VPN connections.
A Security Association (SA) is the group of security settings related to a specific VPN tunnel. 
This screen displays active VPN connections. Use Refresh to display active VPN connections.

Encapsulation 

Mode

Select Tunnel mode or Transport mode from the drop-down list box.

Active Protocol

Select ESP if you want to use ESP (Encapsulation Security Payload). The ESP 

protocol (RFC 2406) provides encryption as well as some of the services offered 

by AH. If you select ESP here, you must select options from the Encryption 

Algorithm and Authentication Algorithm fields (described next).
Select AH if you want to use AH (Authentication Header Protocol). The AH 

protocol (RFC 2402) was designed for integrity, authentication, sequence integrity 

(replay resistance), and non-repudiation but not for confidentiality, for which the 

ESP was designed. If you select AH here, you must select options from the 

Authentication Algorithm field (described next).

Encryption 

Algorithm

Select DES, 3DES or NULL from the drop-down list box. 
When DES is used for data communications, both sender and receiver must know 

the Encryption Key, which can be used to encrypt and decrypt the message or to 

generate and verify a message authentication code. The DES encryption algorithm 

uses a 56-bit key. Triple DES (3DES) is a variation on DES that uses a 168-bit key. 

As a result, 3DES is more secure than DES. It also requires more processing 

power, resulting in increased latency and decreased throughput. Select NULL to 

set up a tunnel without encryption. When you select NULL, you do not enter an 

encryption key.

Authentication 

Algorithm

Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and 

SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet 

data. The SHA1 algorithm is generally considered stronger than MD5, but is 

slower. Select MD5 for minimal security and SHA-1 for maximum security. 

Encryption Key 

This field is applicable when you select ESP in the Active Protocol field above. 
With DES, type a unique key 8 characters long. With 3DES, type a unique key 24 

characters long. Any characters may be used, including spaces, but trailing spaces 

are truncated.

Authentication 

Key

Type a unique authentication key to be used by IPSec if applicable. Enter 16 

characters for MD5 authentication or 20 characters for SHA-1 authentication. Any 

characters may be used, including spaces, but trailing spaces are truncated.

Apply

Click Apply to save your changes back to the ZyWALL.

Cancel

Click Cancel to exit this screen without saving.

Table 90   SECURITY > VPN > VPN Rules (Manual) > Edit (continued)