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  • Block unauthorized user from using network

    Hi,

    in my company i have windows 2003 DC, and currently anyone that connect network cable, can use company Internet, can i block it?

  • #2
    Re: Block unauthorized user from using network

    What system you use for your internet connection? MS Proxy, ISA, Websense, Surf Control, PIX, Bluecoat?
    Server 2000 MCP
    Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

    ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

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    • #3
      Re: Block unauthorized user from using network

      Don't think this is the right forum for this question...
      Having a Internet proxy could accomplish this. Also, if you configure all your machines to have static IPs (not recommended unless you have something like 10 or fewer computers) then you could use your firewall to block all but legitimate computers, plus people just plugging in would have to have a knowledge of your subnet info to even attempt to connect to the Internet.
      Regards,
      Jeremy

      Network Consultant/Engineer
      Baltimore - Washington area and beyond
      www.gma-cpa.com

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      • #4
        Re: Block unauthorized user from using network

        Instead of static IP's a more sensible solution on a big network is reserved IP addresses on your DHCP server.

        Blocking at the internet connection is easier though. Using something like ISA or Websense or Bluecoat will accomplish this very easily.

        You could also look at 802.1x - if your switch supports it. Or VLANs.

        There are MANY ways to solve this but as Jeremy hinted at GPO is CERTAINLY not one as the computer being plugged in will almost certainly not be a member of the domain and as such will not get any of your domains GPO's applied.
        Server 2000 MCP
        Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

        ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

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        • #5
          Re: Block unauthorized user from using network

          if its only you're managed client computers, enter a fake proxy server into a GPO.
          Marcel
          Technical Consultant
          Netherlands
          http://www.phetios.com
          http://blog.nessus.nl

          MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
          "No matter how secure, there is always the human factor."

          "Enjoy life today, tomorrow may never come."
          "If you're going through hell, keep going. ~Winston Churchill"

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