MAC Address issue
MAC Address issue
- Subject: MAC Address issue
- From: Jonathan Guy via Macnetworkprog <email@hidden>
- Date: Thu, 9 Jan 2025 14:40:43 +0000
Hi all,
I'm struggling to identify the cause of a really strange issue that has started
to plague our network of Mac devices. We use Cisco switches and have port
security turned on which means any device that registers more than one MAC
address triggers a port violation which then shuts down the port for a short
period of time (5 mins I believe).
A few months ago we suddenly started get lots of violations from Mac devices
the were all registering additional MAC addresses (2 usually) that all had the
same 6 character prefix (00:00:40).
So far we've not been able to determine the cause and now getting pretty
desperate and exploring all possible avenues.
All we know is that prefix is registered to a company called Applicon from back
in the day but is now shut down.
Has anyone come across this issue or know of any possible reason why this may
be happening?
Thanks
Jonathan
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