If 1 of the wans goes down (is actually disconnected from router) then it will reroute everything to the remaining wan.
However you need to be wary because my 2nd wan is a 4g usb dongle and when it runs out of data quota my isp blocks traffic...it is STILL connected though...so router still directs traffic through it but never gets anything back because its being blocked by isp.
However you need to be wary because my 2nd wan is a 4g usb dongle and when it runs out of data quota my isp blocks traffic...it is STILL connected though...so router still directs traffic through it but never gets anything back because its being blocked by isp.