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Well I have the following setup...
Computer A , B and C are networked....
Computer A is connected to the internet, computer B and C are not setup for internet access currently but I guess its possible with some kind of setting they would eventually be able to access the internet and this is what I would like to prevent.
In summary only A should have internet access while A and B and C should still be on intranet.
Is this kind of config possible?, what kind of software or setup or tools would I need to achive this?

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    From your comment, I'm not convinced a technological solution is best for your problem.
    – Captain Segfault
    Commented Oct 13, 2009 at 1:24
  • What else could be the alternative?
    – Kevin Boyd
    Commented Oct 13, 2009 at 11:28

1 Answer 1

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Block their MAC addresses from accessing the internet in your router.

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  • Currently I don't have a router but a switch.. can that also block mac addresses?
    – Kevin Boyd
    Commented Oct 12, 2009 at 23:55
  • Also what kind of tool can I use to find MAC address of the said computers does windows have anything like it?
    – Kevin Boyd
    Commented Oct 12, 2009 at 23:57
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    If your switch has an administration page yes. The router/switch should show MAC addresses of connected nodes if they are active, if you want to obtain them manually run ipconfig (ifconfig on linux) or getmac from the command line (ipconfig would be easier to pinpoint the NIC card). If you explain your situation to us a bit better we can find a better solution. Are you simply trying to block kids from the internet? Take away the ethernet cable.
    – user1931
    Commented Oct 13, 2009 at 0:05
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    As long as your computer isn't configured as the gateway, then no.
    – user1931
    Commented Oct 13, 2009 at 0:43
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    There are multiple ways to MAC filter, the method that should be chosen is "Only allow MACS in the allow list to access the internet" then he can simply add his, problem solved, you can do all the spoofing you want. And if your colleagues are that intent on getting on the internet rather than doing their work, I'd let higher management know. Going further than this shouldn't be necessary. Once you realized you've been blocked from something at work, trying to circumvent it is the last thing you should do if you value your job.
    – user1931
    Commented Oct 13, 2009 at 1:31

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