i have installed windows 2003 std. server on my HP server machine.I have one single public IP.I have distributed Internet among 10 others computer using private IPs using routing and remote services (NAT ) in windows 2003 server through two ethernet cards (one for public IP and another for private IPs).Now , i want to block internet traffic on particular computer using MAC address of that computer while sitting on server machine irrespective of any private IP assigned to that computer.i am seeking help for this arrangement in my server.is there any method to implement such type of mechanism.Pl. help me

Hi Vipin, This is Exchange Server Admin forum, suggest you to post your query in Windows Forum to get better and faster responses from product experts. Windows NewsGroup: http://technet.microsoft.com/en-us/windowsserver/bb841405.aspx Besides, I think you can configure IPSec policy to configure the port blocking from server side, check below article for further detail. How to block specific network protocols and ports by using IPSec http://support.microsoft.com/default.aspx/kb/813878

Although,this article does help me in learning IP securities but my problem is another.Let me explain with example. Ihave one static IP address viz. 202.X.X.115. I have installed two LAN card on server machine and installed windows 2003 server on this machine.I have assigned TCP/IP configurations on one card using this static IP address ,DNS and gateway address.I have distributed Internet among the client computers using routing and remote services in windows 2003 server onsecond ethernet card while configuring private IPs on client computers in the range of 192.168.X.2 to 192.168.X.30 ,(local gateway of this card is 192.168.0.1). Through this mechanism all client computers are receiving good Internet connectivity. Now ,I want to block internet connectivity only on computer having private IP address 192.168.0.9 while other comuters must get Internet connectitvity as usual. can I block internet connectivity on this computer using MAC address of this computer or is there any method in windows 2003 server OS to implement it. Pl. help me andreply as soon as possible. Thanking you.