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The key thing...
The EdgeMax Router... every ethernet port is a physically distinct network.
Meaning a distinct IP range on each port.
i.e.
Eth1 = 192.168.1.1-192.168.1.255
Eth2 = 192.168.2.1-192.168.2.255Typically, you want a switch after the EdgeMax so that you run a single network if you expect devices attached to different WiFi access points to talk to each other.
If you are all Mac, and that is using Bonjour or other auto-discovery stuff... then you do want everything on the same network.
https://www.lfgss.com/conversations/156865/?offset=10200#comment13297893