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[dhcp] how to obtain ip address from specific scope

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  • [dhcp] how to obtain ip address from specific scope

    hello,

    today in our mcse course we learned about dhcp.

    what i didn't understand how to make a specific client to obtain the right address from the right scope.

    explain:

    let's say i have 1 lan of the helpdesk team and want to give this group the scope: 10.10.99.1 - 10.10.99.255

    the 2 lan is the company users and i want to give them the scope: 10.10.1.1- 10.10.1.255

    thanks
    Last edited by largo; 10th November 2008, 19:44. Reason: typo
    Any advice is given in good faith and without warranty.
    Please give reputation points where appropriate.

  • #2
    Re: [dhcp] how to obtain ip address from specific scope

    Look into the use of "DHCP Class IDs". From what little I've seen of it, it's rarely used though and might be a bit cumbersome. I believe that you have to manually bind each NIC to one class ID or another.
    Wesley David
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    • #3
      Re: [dhcp] how to obtain ip address from specific scope

      Can you not achieve this by setting up reserved IP addresses?
      Gareth Howells

      BSc (Hons), MBCS, MCP, MCDST, ICCE

      Any advice is given in good faith and without warranty.

      Please give reputation points if somebody has helped you.

      "For by now I could have stretched out my hand and struck you and your people with a plague that would have wiped you off the Earth." (Exodus 9:15) - I could kill you with my thumb.

      "Everything that lives and moves will be food for you." (Genesis 9:3) - For every animal you don't eat, I'm going to eat three.

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      • #4
        Re: [dhcp] how to obtain ip address from specific scope

        Create vlans and use Iphelper address to the DHCP server.
        Give the VLAN an ipaddress and the requested will be forwarder from that ip address.
        The DHCP server will give you an address from that range.
        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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        • #5
          Re: [dhcp] how to obtain ip address from specific scope

          Hmmm I wrote it a bit doggy but ok..

          What is happening with this:

          Client sits in a VLAN, and is requesting a IP address.
          The switch is receiving this and because he is detecting that this is a DHCP request, he forwards the packet with his own address.
          The DHCP server sees the ipaddress of the vlan and supplies an ip address from that range.

          But some people are better to explain it from EE
          http://www.experts-exchange.com/Netw..._21464595.html
          JFrederick29:
          It picks up the correct address based on the source of the DHCP request (assuming your are using the IP helper command). For example, if VLAN210 has an IP address of 172.27.21.1 assigned to it and you are using the "ip helper-address" command to send DHCP requests to the DHCP server, the source of the DHCP request will be 172.27.21.1 so the DHCP server will issue an address from the 172.27.21.0 subnet.
          Last edited by Dumber; 20th November 2008, 10:19.
          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: [dhcp] how to obtain ip address from specific scope

            thank to all of you ,

            especially you Dumber\marcel , you explanation cleared me the issue
            (by the way i can't read nothing from ee so thank you for bringing the quote)
            Any advice is given in good faith and without warranty.
            Please give reputation points where appropriate.

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            • #7
              Re: [dhcp] how to obtain ip address from specific scope

              If you scroll down you MIGHT be able to read it, however sometimes you can sometimes you cannot.
              I still don't know when you can or cannot read it. I don't have an account either.
              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"

              Comment


              • #8
                Re: [dhcp] how to obtain ip address from specific scope

                i'm with the same question about ee,

                i wanted to ask if the same idea goes (i don't think)
                when i have remote branches thaking they pool address from the company dhcp server (only one)

                example :

                los angeles - 10.172.36.1
                new york - 10.172.50.1
                and so on
                Last edited by largo; 10th November 2008, 22:32. Reason: explain
                Any advice is given in good faith and without warranty.
                Please give reputation points where appropriate.

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                • #9
                  Re: [dhcp] how to obtain ip address from specific scope

                  yes it can,
                  but usually I would put an own DHCP server onsite. A router can also be a dhcp server.
                  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"

                  Comment


                  • #10
                    Re: [dhcp] how to obtain ip address from specific scope

                    It makes sense to have DHCP at each site. If the WAN link goes down, sites without a DHCP and DNS server could run into difficulties.
                    Gareth Howells

                    BSc (Hons), MBCS, MCP, MCDST, ICCE

                    Any advice is given in good faith and without warranty.

                    Please give reputation points if somebody has helped you.

                    "For by now I could have stretched out my hand and struck you and your people with a plague that would have wiped you off the Earth." (Exodus 9:15) - I could kill you with my thumb.

                    "Everything that lives and moves will be food for you." (Genesis 9:3) - For every animal you don't eat, I'm going to eat three.

                    Comment


                    • #11
                      Re: [dhcp] how to obtain ip address from specific scope

                      Originally posted by gforceindustries View Post
                      It makes sense to have DHCP at each site. If the WAN link goes down, sites without a DHCP and DNS server could run into difficulties.

                      I second it. If the networks are in the same physical location, better avoiding more than one DHCP server. Also if sites are in separate WAN locations or connected via wifi links, chances to get DHCP requests blocked are high.
                      Last edited by mohanmathew; 20th November 2008, 08:26.
                      Mohan Mathew[VU3MMU]
                      MCITP [AD]

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