Security issue with the vista pc

Unanswered Question
Jan 22nd, 2010
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i have configured an interface with port security as follows:

port sec

port sec max 1

port sec act shut

and connected one pc. But when vista pc got connected to the above secured port, that pc was able to access the lan and it doesn't violated port.

As we configured the above port with port sec max 1, it should not allow that vista pc right? what may be the reason?


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Giuseppe Larosa Fri, 01/22/2010 - 09:57
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Hello Rammi,

in the other post you complain that port security works and here you complain that it is not working

it is the same switch, what IOS version is running?

can the original PC or vista PC (not clear) be running any virtualization software? they can associate additional MAC addresses to the PC NIC.

also, using port security max  first MAC address seen on port is considered secure.

I would suggest you to start to teast by adding manually the MAC address.

Besides this, the secure host MAC address table has its own timers and can be influenced by some additional commands the aging time can be based on inactivity  on the port or it can be absolute.


Hope to help



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