I do not know why an ethernet switch, which I assume is basically a pass-through device, should isolate the TC from the modem, but thought that it could not hurt to give it a try. I had a conversation with one of the Apple Specialists who suggested placing a router (with the wifi signal turned off) or an ethernet switch between the modem and the Time Capsule to try to isolate it and that is what I have done. As it is I have had repeated problems using it as a router as it seems very sensitive to fluctuations in the incoming modem signal and I was constantly having to reboot it or reset and reconfigure it. I assume that it was introduced something like 4 years ago and that is why I called it "somewhat old". I was new to the Mac when I bought my MBP 2 1/2 years ago and bought a refurbished TC at about the same time so it was the previous version, not the one that was new at that time. Based on this I guess I assumed incorrectly. Of course I know that each can receive wifi from the devices like laptops, iPads and so on, but I assumed that those devices used different handshakes than the base stations and that the TC and AE needed a hard ethernet connection. I was not aware of the TC or the AE being able to receive wifi signals from each other and rebroadcast them, but I guess that is what would have to happen. The Apple webpage said that the Extreme could be used as an extender for the Time Capsule and showed a graphic of how that works but there was no physical connection between the TC and the AE. I was actually reading about doing exactly what you suggest with the Airport Extreme the other day but I guess I am missing something about the devices themselves. See related MacWorld article: Does your AirPort Extreme Base Station work but is unreachable via AirPort Utility?.Click to expand.I was new to the Mac when I bought my MBP 2 1/2 years ago and bought a refurbished TC at about the same time so it was the previous version, not the one that was new at that time. It seems there's a bug in at least the 7.7.7 and 7.7.8 firmware revisions that causes the AirPort Extreme to become unmanageable (though still functional as a router) if you sign into one of your Apple IDs to use Back to My Mac :/ The AirPort should appear and be manageable (by clicking on it) for a brief period-quickly click on it, click Edit, then clear out any Apple IDs in the 'Back to My Mac' section.Plug it back in, and connect to the WiFi network as soon as possible, then immediately go to the AirPort Utility.Unplug your AirPort Extreme, and wait 10 seconds.Open AirPort utility (it will likely show "Device Not Found").Basically, everything was running great, then one day around August 2016, my Extreme disappeared from the network-even though it was routing Internet traffic for all the devices in my house just as good as ever! If you've had an AirPort Extreme for a while, and recently (within the past year or two) had it go missing from your network (when you open AirPort Utility you get 'Device Not Found'), there's a good chance you ran into the same issue I did.
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