It would be nice if it was possible to select one of the 1Gbit ports for Ethernet2/Ethernet WAN2 on the Flint2 so that the 2.5G lan port can still be used.
This would be handy if you have a fast primary wan but a slower than 1Gbit/s secondary.
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That is possible to configure the LAN2 (1Gbps) interface to work as WAN in the Luci page.
Uncheck the LAN2 in the br-lan.
Create and name the 'WAN3' and select the LAN2, check it into the WAN group in the firewall.
Probably also needs the interface metric changed otherwise it will become the default route, that said I also don't think this works with the failover scripts because its not the expected interface
I think I changed KMWAN to track WAN3 instead of secondwan, but I'm not 100% sure.
Edit: Looked at the kmwan config a bit further and figured out how to add an interface to it rather than trying to bodge secondwan 
yes, custom interface lan2 (wan3) does not work with the failover, the 'kmwan' is for wan1 and wan2 (also lan1), it adapts only in the GL firmware.
Probably can install the vanilla OpenWRT + the plugins mwan3
I think it is working, I added an entry to /etc/config/kmwan, it's setting the metric, it's also stating it added the interface in dmesg when kwan is restarted.
[61645.276121] kmwan: All nodes are deleted.
[61645.287457] kmwan: sensitivity and mode are set.
[61645.378122] [add_dev_config 287]add node success. iface:wan, dev:eth1, ifindex:3
[61645.385628] [add_dev_config 287]add node success. iface:WAN3, dev:lan2, ifindex:4
I did think about stock openwrt, but I'd quite like to play with astrowarp 
For now, I could just put the 2nd wan into the normal port, but I was thinking of upgrading my network to 2.5G at some point soon so I wanted the 2.5G LAN port free ideally.
Great. It supposed to cannot show the WAN3 interface in the GL GUI -> Network -> Multi-WAN
So after some more playing around it seems it's even possible to get kmwan to see a wan that's actually a VLAN on one of the lan ports.
I found it easier to rename WAN3 to WANTHREE as it's expecting the ipv6 interface to end in a 6
It didn't seem to like WAN3_6, and I didn't want to try WAN36
WANTHREE and WANTHREE6 seem to work
This frees up a port on my switch (My Starlink/Cellular connections are elsewhere in the building to where the Flint2 is, so they get trunked over on a VLAN)
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