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Hi Maysee, my name is Johnnatan and I am part of the Small business Support community.You can filter the mac-addresses you don´t want to have access to your device, you can do this going Firewall>Mac filtering> Mac filtering, you can take a look of this document in order to configure it.
http://www6.nohold.net/CiscoSB/Loginr.aspx?login=1&pid=2&app=search&vw=1&articleid=737
By the way, you post your question in a wrong forum, post in "Small business Security". You can move your post using the actions panel on the right.
I hope you find this answer useful, if it was satisfactory for you, please mark the question as Answered. Please rate post you consider useful.
Greetings,
Johnnatan Rodriguez Miranda.
Cisco network support engineer
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Greetings,
Johnnatan Rodriguez Miranda.
Cisco Network Support Engineer.