@Gertjan said in Ethernet devices being assigned WI-Fi Range IP addresses - How do I keep the subnets separate?:
Normally, when you are at home, and wired up (cable) you shut down ( there is a key on the keyboard for this ) the Wifi.
I have never done that. I just rely on the metric. Also, with Linux, unlike Windows, the WiFi address is still reachable via the Ethernet port. So, if I ping the WiFi address, while connected with Ethernet, the ping goes in via Ethernet. I have verified that with Wireshark.