Draytek Vigor3220 Series User Manual page 64

Active When
After finished the above settings, click OK to save the settings.
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If you choose Failover as the Active Mode, the option of
Active When will appear.
Any of the selected WAN disconnect – Such WAN

connection will be activated when any selected WAN
interface (checked below) disconnects.
All of the selected WAN disconnect – Such WAN

connection will be activated only when all of selected
WAN interfaces (checked below) disconnect.
Check boxes for WAN1 to WAN5 – Specify the WAN

interface by checking the WAN box.
Vigor3220 Series User's Guide