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Anybody here with a #linux #firewall #router that has two upstream internet links with #failover between primary/backup?

I'm trying to RTFM just *how* that would be done without a stupid shell script in a cron job "Can I ping interface1's gateway? No, remove it from the routing table" because routes _tend to be sticky_ and it doesn't make sense to _stay_ on a backup network connection if the primary (faster) connection has been restored.