Tue Feb 07, 2023 11:52 am
Your config file doesn't match the screenshoot however, and shows a rather old version (although 6.47.10 was a great release, it's no longer the long-term build). I'll assume your screenshoot is "more accurate", and your config is largely based on the defaults (like the included one).
So in the photo... you have a NAT rule for your LTE WAN on ether2, but it generally better to use /interface/list (Interface > Interface Lists in winbox) to add the 2nd WAN port to the "WAN" list – the default firewall then do filtering/NAT correctly. So you don't need a seperate NAT rule and the firewall correctly filter by using the LTE ether2 WAN being a member of the WAN interface list.
You'd also want to make sure ether2 is not a port of the bridge (similar to how ether1 WAN is not part of bridge).
And for failover, make sure the DHCP client for ether2 uses default-route-distance=2 (or something bigger than the default-route-distance on the dhcp-client for ether1).
Why wireless won't work, vs LAN, hard to guess with the wrong config.