Region : UnitedStates

Model : TL-ER6120

Hardware Version : V1

Firmware Version :

ISP : comcast/frontier

trying to configure fail-over setting
if wan-1 goes down the only way it moves wan-2 is if i unplugg wan-1
how do i setup to automatic switch over when wan-1 loses internet connection ?
i did link backup setup in load balancing.
when i go to dianostics and online detection it says online detection failed for wan-2.
the wan-2 is connected to internet. if i unplugg wan-1 i can still connect to the internet.
is it a possible capability issue with modem?