@alexhaydock My setup is a bit hacky. Most notably, I have to *break* two public IPv4 addresses. So I broke Google DNS.
It pings Google DNS IPs on the router, where master is routed to one physical network and slave routed to the other.
It's a static route, and the way it's done means that clients connecting to the router can't use Google DNS.
The router pings each one, to know which line is up.
Switching takes ~1 minute, so I make it stay on the backup for 8 hours before switching back.
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