[geeks] Network Nightmare

[Mike Meredith]

On Mon, 20 Jul 2020 09:30:27 -0400, Nathan Raymond wrote:
> Unplug network cables, then plug things in one at a time until the
> problem recurs. You can often look at the activity lights and will

If you have double wall sockets, look for where people have 'tidied' up
unused network cables by plugging one end into one socket and the other
to the other. It's a regular thing at $work (fortunately we have
managed switches). STP (or more updated versions of the same) is the
killer feature of managed switches - worth the price of admission to
stop this sort of issue in its tracks.

The other possibility (although I think that a loop is probably more
likely) is that you've got a rogue dhcp server handing out "bad" IPs.
Watch out for someone who has brought in a domestic router to attach
more 'stuff' to the network. Or there's a conflicting IP using the same
address as 'something important'.

--
Mike Meredith (http://zonky.org/)
  One test is worth a thousand opinions.

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