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Hello,
I have a RUT240 configured with eth1 as primary WAN and Mobile as WAN backup.
I note that the device tries to use the DNS servers configured for eth1 also when the active WAN interface is Mobile, and it is causing a lot of issues.
eth1 is still UP but the Health check fails, so the active WAN is switched to the Mobile one.
Firmware is RUT2XX_R_00.01.14.5.

How to fix the issue?

Thanks,
M

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Hello Massimo,

For RUT240 I tried reproducing same issue with RUT2XX_R_00.01.14.5. And, the failover is working fine for me. 

However can you please share me the troubleshoot files in private chat.

You can download the troubleshoot file from: 

Webui > System > Administration > Troubleshoot.

Regards,

Shivang