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SONICWALL SONICOS ENHANCED 2.5 ADMINISTRATOR’S GUIDE
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Network > WAN Failover & LB
Activating WAN Failover and Load Balancing
To configure the SonicWALL for WAN failover and load balancing, follow the steps below:
1
On Network > WAN Failover & LB page, select Enable Load Balancing.
2
From the Secondary WAN Interface menu, select your secondary WAN interface.
3
Enter a number between 5 and 300, in the Check Interface Every _ Seconds field. You can use
the default value of 5 seconds
4
In the Deactivate Interface after _ missed intervals, enter a number between 1 and 10. You can
use the default value of 3. If the default value is used, then the interface is considered inactive
after 3 successive attempts at 5 seconds each.
5
Enter a number between 1 and 10 in the Reactivate Interface after _ successful intervals. You
can use the default value of 3. If the default value is used, then the interface is considered active
after 3 successive attempts at 5 seconds each.
6
Click Apply.
Choosing an Outbound Load Balancing Method
You need to choose a load balancing method. By default, the SonicWALL will select Basic Active/
Passive Failover as the method, but there are four load balancing methods available:
• Basic Active/Passive Failover: When this setting is selected, the SonicWALL security appliance
only sends traffic through the Secondary WAN interface if the Primary WAN interface has been
marked inactive. The SonicWALL security appliance is set to use this as the default load balancing
method. If the Primary WAN fails, then the SonicWALL security appliance reverts to this method
instead of the ones described below. This mode will automatically return back to using the Primary
WAN interface once it has been restored (preempt mode). This item has an associated Preempt
and fail back to Primary WAN when possible checkbox. When this checkbox is selected, the
SonicWALL security appliance switches back to sending its traffic across the Primary WAN
interface when it resumes responding to the SonicWALL security appliance’s checks (the WAN’s
physical link is restored, or the logical probe targets on the WAN port resume responding).