Viewing Sa Monitor - ZyXEL Communications P-2602HWLNI User Manual

Table 111 VPN: Manual Key (continued)
LABEL
My IP Address
Secure Gateway
Address
Security Protocol
IPSec Protocol
Encryption
Algorithm
Encapsulation Key
(only with ESP)
Authentication
Algorithm
Authentication Key
Back
Apply

18.16 Viewing SA Monitor

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.
P-2602HWLNI User's Guide
DESCRIPTION
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 Chapter 7 on page 101
traffic redirect.
Type the WAN IP address or the URL (up to 31 characters) of the IPSec router
with which you're making the VPN connection.
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 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.
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.
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.
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.
Click Back to return to the previous screen.
Click Apply to save your changes back to the ZyXEL Device.
Chapter 18 VPN Screens
for details on dial backup and
295