@Andone I just found out that my Primary WAN "Online Detection" keep showing ONLINE, even I have disconnect internet on Primary WAN. Thats why the backup WAN will not wakeup. But if I disconnect...

@Andone what do you think the impact of WAN's static/dyanamic ip, dns, subnet on failover?

@Andone Now I am trying to set my both modem....the ports on modem I set from auto to "LAN ONLY". Maybe thats the problem. Will simulate a while then get back report to you.

@Andone My devices connect through Wireless Routers before R470T+. 2 Modem >> Load Balance >> 2 Wireless Router >> Devices how to make Devices IP showed up on R470T+ ? Yes, I want to control certain...

@pt33 This guy use ip policy routing which direct connection to priority WAN. Used that also, but do not notice the zero time failover. Still need about tens of second.

Currently I simulate failover, found out that the device need about 1 minute plus to make failover happen. I also tried, without failover, to let all traffic use priority WAN (by ip policy routing)....