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openwrt-wan-failover
This is a simple script/service that constantly pings your primary interface (WAN) and secondary interface (WWAN, though I suppose in practice it doesn't have to be a wireless WAN link).
Install it with the install.sh script on your OpenWRT device, and
either reboot, or start it immediately with service wan-failover start.
There is currently no UI to configure it; use uci or manually edit the
provided sample configuration file before installing.
Before starting the service, you should set your primary interface's metric to 10, and the backup to 20.