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some of users are already knew our LAN IPs .. so they can manually configure an interface on their PC and completely bypass our DHCP seerver..
I thought this can be done by checking its MAC address, so although they use valid IP address but if their MAC address not recognized by our server then they must be denied and they cannot go anywhere and cannot do anything in our LAN..
Faced with intelligent troublemakers, this is daunting. They can spoof MAC addresses and cause other mischief easily. Can you physically prevent them from connecting to your LAN?
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