How does Screen Mirroring, AirPlay, ethernet, wifi and an Apple TV work together?

Cupertino, January 7, 2022

So I fixed an issue with Screen Mirroring on Apple TV 4K. Whenever I tried to mirror the Apple TV on my MacBook, iPad, or iPhone, the Apple TV would turn black for a few seconds and then return to what it had done before. To be absolutely clear, I'm just talking about the Screen Mirroring feature in the Control Center or the addition of the Apple TV as an additional display on the Mac. I'm not talking about AirPlay, which has always worked perfectly for me. I finally discovered that Screen Mirroring would work if I disconnected my ethernet cable from my Apple TV. I assumed this was a weird mistake, because there are a lot of results if Google "screen mirroring doesn't work on ethernet." Another finding was that it actually worked, I just assigned the same static IP address to both Ethernet and Apple TV Wi-Fi. I did not assume that this would be a problem, as I assumed that they would never be used at the same time. The wifi option even disappears from the settings menu if you connect an ethernet cable. I was wrong, though. We set separate static IP addresses for ethernet and wifi and voila - Screen Mirroring works again. Somewhat. For some reason, it is even later than when using wifi without ethernet. So my question is why? And is it solvable? How do they all play together? I guess Screen Mirroring always uses wifi to share the display, while AirPlay is good to use ethernet because it downloads directly from the internet? I would like a perspective.

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