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Baffled - RPi WiFi only seems to work when Ethernet is plugged in - SOLVED
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rx8pilot:
I have an RPi 3B that has been doing a simple headless automation task for a few years. It has been connected via WiFi all this time.
Last week, it stopped responding and I realized it was not connected to the WiFi anymore. I then attached an ethernet cable to troubleshoot. The ethernet immediately got a DHCP issued address, but the WiFi also connected. I was not expecting the cable to have anything to do with the Wireless.
As long as the cable is plugged in (which gets its own unique IP) the WiFi works. I can SSH to the IP given to the WLAN interface until the ethernet cable is disabled or disconnected.
Not sure where to start on this, but guessing this may be a question for someone far more pro in Linux than me. Personally, I have never seen this behavior before.
rx8pilot:
Found the problem.....
The person that setup this RPi had set a static gateway on the wireless interface. It looks like it was full DHCP on the surface. Sneaky little problem for a non-pro like me.
I generally go full static or full DHCP.
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