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Amit;
After reading what you are dealing with further, without a firewall you can not get to where you want to be. The router is not able to offer port or IP restrictions. Not positive, but that is what I suspect.
Using ACL's on your router I do ...
Peter;
You have the correct concept but I do not know enough to guide him. A hardware firmware solution or an OS solution. I gave him both.
I basically said the same as you did but maybe explaining a bit more logic and concept behind my thought proce...
HOW TO BLOCK A MAC ADDRESS TO THE INTERNET ON A PRIVATE NETWORK.
I'm looking at the same issue for a client. Security and disclosure issues.
Trust me, a difficult model to manage, especially in a large node network. Hardware swaps etc.
I may be...