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Using script to switch from using ethernet to usb port

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zachary

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I wish to use the dual Wan with my 1+1gbps fibre broadband and at the same time have a 4g USB dongle as a failover. As the primary wan will be used for first 1gbps (eth0) and secondary wan used for second 1gbps (eth1) with load balancing enabled, I am not able to setup the 4g USB dongle (usb0) as a failover on the secondary wan. Therefore, I would like to write a script to check when primary and secondary wan are down, I will then assign secondary wan to the 4g USB dongle and restart secondary wan to activate 4g USB dongle. Then when wan 1 is up again, I will assign secondary wan back to the second 1gbps and restart secondary wan. Can I know if it is possible to write a script for it and can anyone point me to any documentation that allows me to do that, especially how I can switch secondary wan from eth1 to usb0?
 
Before you even start, Dual WAN failover doesn't work reliably in Asuswrt. The code is the same in Asuswrt-Merlin.
 
Thanks. I am already using load balancing as I have two 1gbps broadband. The issue is that both are from the same isp and maybe down at the same time so I wish to switch to 4g dongle when both 1gbps are down.
 
 
Yeah, I'm not a fan of Asus dual WAN implementations either. Maybe it has improved recently. I went with a 2 router network solution instead. It overcome a CG-NAT limitation I had with one service also.
 

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