I have a question regarding a MAC address that popped up twice on two different switches on our network; the MAC address is 7e77.3777.5776. We have setup port security on all our switches, allowing only two MAC Addresses per port. One for an IP phone and the other for machine.
When the violation occurred on two different occasions, I checked the last MAC Addressed that tried to access those ports and it turned out to be the same MAC address of 7e77.3777.5776. This MAC address can't be traced, I know the two people who are connected to those ports didn't try to connect any other machine to their port.
Would I be right to say that someone is using a spoofed MAC address? I believe it's not a physical connection. Someone else on this forum posted the very same question in 2011, and what's bizarre that he had the same problem with the very same MAC address.
Here's the link to his question posted on this forum:
Paul, that is a good suggestion but would I be able to catch it again popping up as port security violation? 'cause if I can't then I would do it later. As I would like to know from where did MAC Address originated from? Could it be traced? Should I dare and think that we could be victim of ARP Poisioning? Is MAC Address Spoofing possible with Port Security enabled on all switches?
Any suggestion would be good. Thank you for responses
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