Not sure there is a way to do this without a routing protocol.
Don't think there is link monitoring or path monitoring to switch the default
route to backup route.
Maybe you can have a cron job that check the link status and next hop
connectivity and switch the route when there is a failure.
G
I am assuming wan1 is also connected to same network as wan0, is that correct?
Curious, what is your use case for wanting to have two interface connected to
same network?
Also, check to see if you got an address from DHCP and try to ping the next hop
first.
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