ZyXEL Communications ZyXEL ZyWALL 2WE - Manual (Page 318)

ZyWALL 2 and ZyWALL 2WE
27-24 VPN/IPSec Setup
Table 27-9 Manual IKE VPN Rule Setup
LABEL DESCRIPTION
Authentication
Algorithm
Select SHA1 or MD5 from the drop-down list box. The ZyWALL's authentication
algorithm should be identical to the secure remote gateway. MD5 (Message Digest 5)
and SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate the
source and integrity of packet data. The SHA1 algorithm is generally considered
stronger than MD5, but is slower. Select SHA-1 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 SHA-1 authentication. Any
characters may be used, including spaces, but trailing spaces are truncated.
Click Apply to save your changes. Click Reset to begin configuring this screen afresh.
27.14 SA Monitor
In the web configurator, click VPN and the SA Monitor tab. 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.
When there is outbound traffic but no inbound traffic, the SA times out
automatically after two minutes. A tunnel with no outbound or inbound traffic is
"idle" and does not timeout until the SA lifetime period expires. See the section on
keep alive to have the ZyWALL renegotiate an IPSec SA when the SA lifetime
expires, even if there is no traffic.