https://help.mikrotik.com/docs/pages/vi ... d=26476608

Failover (WAN Backup)

This is a basic failover guidance document, where no other traffic is involved or discussed ( no LAN servers, no VPN etc....) just two wans and a LAN.

I see two major problems on this doc:

1. Why does MT bring up MANGLING. To me this is confusing for the new beginner and not required.
2. Even if mangling was required, which it is not, the other error is having both mangle chains as OUTPUT? The connection-marking chain should be PRE-ROUTING

Please correct my thinking if I am off base. I am quite happy to be wrong!!
...... ....

Note: I also take issue with their first example when they use the same source GOOGLE for checking both ISP1 and ISP2. Truer redundancy ( yes I know the IPs are different but still ) would be to use a different IP (dns provider) for connectivity. At least they do so, use a different source for a second check on each ISP, but again its the same company - different ISP........... sigh.........