After reading all 20 pages of this post I am still quite confused by the networking.
What I would like is the following basic setup...perhaps someone can help me get started with this, I opted to use systemd config files, I have the appropriate services disabled/enabled
wan: static ip 192.168.1.100
lan0/lan1: these should run as switch ports and offer dhcp to clients in 192.168.2.x
eth0: I am assuming this is really just way to get the to OS via the lan side, but I'm not 100% sure.
What I have tried:
10-wan.network: [Network] - set static address of 192.168.1.100
10-br0.network: [Network] - set static address of 192.168.2.1
10-eth/lan0/lan1: [Network] Bridge=br0
This then requires ifconfig wan up before the port comes up. But then pinging anything from the serial console results in Destination Host Unreachable, cable is plugged into the jack closest to the USB3 port. Both lights are lit up.