Dell SonicWALL GX250 Manual page 159

icWALL becomes active after bootup, it looks for the backup SonicWALL on the net-
work. In some cases, there may be a delay in locating the backup firewall due to
network delays built into some switches. Configure the primary SonicWALL to allow
an increment of time (in seconds) to look for the backup SonicWALLon the net-
work. the default value of 0 is correct.
9. Click Update. Once the SonicWALL has been updated, a message confirming the
update is displayed at the bottom of the browser window.
Note: It is important that during initial configuration, the backup SonicWALL has not
been configured for use. If the backup SonicWALL has previous network settings, it is
recommended to reset the SonicWALL to the factory default settings using Restore
Factory Default Settings located in the Tools section. Additionally, the password must
be changed back to the default password of "password" using the Password tab in
the General section.
10. Power on the backup SonicWALL used for High Availability. After completing the
diagnostic cycle, the primary SonicWALL auto-detects the presence of the backup
SonicWALL and synchronizes the settings.
11. To confirm that the synchronization is successful, check the primary SonicWALL log
for a High Availability confirmation message. Alternatively, you can log into the
backup SonicWALL using its unique LAN IP address and confirm that it is the back-
up SonicWALL.
If the primary SonicWALL fails to synchronize with the backup, an error message is
displayed at the bottom of the screen. An error message also appears on the Status
tab. To view the error message on the Status tab, click General on the left side of
the browser and then Status at the top of the window.
To check the backup SonicWALL firmware version or serial number, log into the backup
SonicWALL, click General on the left side of the browser window and then click Status
at the top of the window. Both the firmware version and the SonicWALL serial number
are displayed at the top of the window.
If the backup SonicWALL serial number was incorrectly specified in the primary
SonicWALL Web Management Interface, log into the primary SonicWALL and correct
the backup SonicWALL Serial Number field.
At this point, you have successfully configured your two SonicWALLs as a High
Availability pair. In the event of a failure in the primary unit, the backup unit takes
over operation and maintain the connection between the protected network and the
Internet.
SonicWALL Internet Appliance Security Guide Page 159