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How to Prevent Broadcast for DHCP Client

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  • How to Prevent Broadcast for DHCP Client

    Hi
    for security resone how can I prevent the client from sending a broadcast to find the DHCP server..
    is there any way to speicfy the DHCP IP so the client will be able to communicate with it direct


    and as there are other DHCP Software .
    if some had install one of these software in my network
    will the client take the offer from it
    Thanks

  • #2
    Re: How to Prevent Broadcast for DHCP Client

    No, I don't think that can be done, as it will be against all the DHCP/BOOTP RFC specifications.

    Maybe you can start a startup company and develop such a tool, however if you're already going to visit each client and specify its DHCP IP address, why not just manually configure the IP address and get done with it?
    Cheers,

    Daniel Petri
    Microsoft Most Valuable Professional - Active Directory Directory Services
    MCSA/E, MCTS, MCITP, MCT

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    • #3
      Re: How to Prevent Broadcast for DHCP Client

      To specify IP Add to the DCHP clients, you will do this from the "Reservation" option on the DCHP server.
      MCSA, MCDST, MCP


      Ordinary Human in an Extra Ordinary World....

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      • #4
        Re: How to Prevent Broadcast for DHCP Client

        Yes but that will NOT prevent the client from having to find the DHCP in the first place...
        Cheers,

        Daniel Petri
        Microsoft Most Valuable Professional - Active Directory Directory Services
        MCSA/E, MCTS, MCITP, MCT

        Comment


        • #5
          Re: How to Prevent Broadcast for DHCP Client

          I agree with daniel.
          I guess that the only option would be a static ip address on the client.
          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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          • #6
            Re: How to Prevent Broadcast for DHCP Client

            I would use VLAN. clients in let's say VLAN 10 would need dhcp helper configured on the network to get the IP from dhcp server. Client that don't need to use dhcp would use separate VLAN and IPs configured manaully (that would suck ).
            But if you gonna use VLANs you would have separate scope for each so I don't know what are the security reasons as you can configure each scope according to you security policies.

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