Draytek Vigor2866ac Quick Start Manual page 33

If the connection will be used as a backup internet connection, set the Active
Mode to Failover:
Select "Any of the selected WAN" if the LTE connection will come online if only
•
one WAN interface selected goes offline. For instance, in the example below, if
either WAN1 or WAN2 are offline, the LTE WAN interface will become active:
Select "All of the selected WAN" if the LTE connection will come online only
•
when all of the WAN interfaces selected are offline:
Click OK to save those changes.
Go to [WAN] > [Internet Access]. Set the Access Mode to 3G/4G LTE Modem
(DHCP Mode) and click the Details Page button:
On the Details for the LTE WAN interface:
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