@AnachronistJohn I've used the two FTTC WANs in two ways: the default one had two controls: one was (is) a ping to an external ip. If the ping fails, it's marked as down and the default router switches to the other one. The second rule monitors the traffic, and if it goes over 120 Mbit/sec for some seconds, it will switch to the other one (for the new connections). It's been stable & reliable for years. Now I've just set (for now) default gateway on the FTTH (distance 1), and the two FTTC at distance 2 and 3. Or I could just set both of them at distance 2 for a sort of round robin.
