Monitoring connected AP clients??

edited March 2006 in Science & Tech
I am running a wireless network in my area, am using D-Link DWL-2100AP to transmit my SSID. Am using MAC filter and WEP. Am using a DHCP server from Mikrotik. I manage my users by their computers MAC addresses too with no username and password.
Since the MAC can be cloned, i have one user that cloned his NIC MAC and he is loging to our network, through a registered MAC of an Access Point client, the question is there is a way i can monitor the connected AP clients?? or find which AP Client he is using?? I want to shut him down.
Any comment and answers are welcome

Thanx for your time
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