ZyXEL Communications P-661HW Manual De Usuario

P-661H/HW Series User’s Guide

224

Chapter 13 VPN Screens

Click Security, VPN and Monitor to open the SA Monitor screen as shown. 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. 
This screen is read-only. The following table describes the fields in this tab.

My IP Address

Enter the WAN IP address of your ZyXEL Device. The VPN tunnel has to be 

rebuilt if this IP address changes.
The following applies if this field is configured as 0.0.0.0:
The ZyXEL Device uses the current ZyXEL Device WAN IP address (static or 

dynamic) to set up the VPN tunnel. 
If the WAN connection goes down, the ZyXEL Device uses the dial backup IP 

address for the VPN tunnel when using dial backup or the LAN IP address when 

using traffic redirect. See the chapter on WAN for details on dial backup and traffic 

redirect.

Secure Gateway 

Address

Type the WAN IP address or the URL (up to 31 characters) of the IPSec router 

with which you're making the VPN connection. 

Security Protocol

IPSec 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).

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 same secret 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.

Encapsulation Key 

(only with ESP)

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 

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 SHA1 for maximum security. 

Authentication Key

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

characters for MD5 authentication or 20 characters for SHA1 authentication. Any 

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

Back

Click Back to return to the previous screen.

Apply

Click Apply to save your changes back to the ZyXEL Device.

Reset

Click Reset to begin configuring this screen afresh.

Table 86   VPN: Manual Key (continued)