• Switch 3 wasn't actually static IP and has gone to a different IP?

    Switches are switches... it still works. Lack of visibility is it's controller not being where you expect it (the IP of it) or the controller having crashed (it can happen even on embedded systems).

    It won't affect the capability of a switch, because that's just raw hardware.

  • That makes sense.

    After nmapping and pinging a few thousand addresses, I just reset it & took the opportunity to update the firmware.

    Then I lost on of the other switches...

    It's back now, though, and it means I can now troubleshoot a dead / dying NAS

    Thanks!

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