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Dynamically Block or Unblock a user’s MAC Address

Hi:

I would like to be able to dynamically (i) block a specific user's machine (MAC address) from being able to access the internet via a Gate Keeper Machine (GKM) and (ii) allow them through again.  Also, while this action is being done, I would like that there would be no disruption to the other users that are currently surfing (e.g watching Youtube; Sending and receiving  e-mail, etc.).  

My two Questions are:
(I) What is the technical name or classification of this system? So that I would know in future.
(ii) Most importantly: What are the applications etc. that I would I need to setup this system (GKM)?

GKM Details:
CentOS 5.5 with 1GB of RAM, two (2) x NICs(One for the users (LAN Switch), and the next for an ADSL router) , AMD Athlon II X2 250 Regor 3.0 GHz Dual-Core CPU; Hard Drive Space: 200GB

My Abilities:
New to setting up a router; squid; iptables; GKM.
Can program in Java and Perl, but prefer Java; working knowledge of MySQL.

Note:  Since I am new to this area, I may need some help with the configuration of the recommended solution when I am stumped.
ASKER CERTIFIED SOLUTION
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ASKER

Based on your experience:
(i) Would this method immediately block or unblock a user?
(ii) Would I have to restart a service or reboot the system?
(iii) Would it allow for the non disruption of the other users?
1. Yes, this method immediately block's a user
2. No restart of any service is necessary. Command is effective imediately.
3. Other users will not notice any change

SOLUTION
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