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  • Problems applying DHCP to a network that have different Vlans

    Hii
    am having problims with appling DHCP to a network that have deferent Vlans
    and I need to give all the clints on deferent Vlans an Ip address from the DHCP server
    am using windows 2003 Ent.
    thanks

  • #2
    Re: Video on How to Configure VLAN s in the Cisco IOS

    Originally posted by yuri View Post
    Hii
    am having problims with appling DHCP to a network that have deferent Vlans
    and I need to give all the clints on deferent Vlans an Ip address from the DHCP server
    am using windows 2003 Ent.
    thanks
    Hi, yuri.
    Please read the forum rules. Especially #13: No thread hijacking! Especially not a sticky thread !
    I asked the moderator to split your post into a separate thread...

    Sorin Solomon


    In order to succeed, your desire for success should be greater than your fear of failure.
    -

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    • #3
      Re: Problems applying DHCP to a network that have different Vlans

      Yuri
      Why don't you create a Win DHCP server scope for each subnet (vlan) with the proper info?
      David Davis - Petri Forums Moderator & Video Training Author
      Train Signal - The Global Leader in IT Video Training
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      • #4
        Re: Problems applying DHCP to a network that have different Vlans

        You'll also need a DHCP relay agent on each VLAN (except the VLAN where the DHCP server resides) in order for the DHCP traffic to cross VLAN (subnet) boundaries.

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        • #5
          Re: Problems applying DHCP to a network that have different Vlans

          For a DHCP server to allocate an IP address to a host in a subnet, the DHCP server needs to have itself an address in the same subnet. When you're dealing with VLANs (thus, different subnets), you have to define a superscope.

          Another link.
          Last edited by sorinso; 29th April 2008, 19:16. Reason: link added...

          Sorin Solomon


          In order to succeed, your desire for success should be greater than your fear of failure.
          -

          Comment


          • #6
            Re: Problems applying DHCP to a network that have different Vlans

            Originally posted by joeqwerty View Post
            You'll also need a DHCP relay agent on each VLAN (except the VLAN where the DHCP server resides) in order for the DHCP traffic to cross VLAN (subnet) boundaries.

            Or an IP-helper address on the switches

            @Sorin, As far as I know superscopes aren't especially needed.
            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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            • #7
              Re: Problems applying DHCP to a network that have different Vlans

              Originally posted by Dumber View Post
              Or an IP-helper address on the switches
              Thats what we use on ours and it works perfectly.

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              • #8
                Re: Problems applying DHCP to a network that have different Vlans

                AFAIK, the DHCP server does not need an ip address nor an interface on each subnet in order to allocate addresses to each subnet from scopes relevant to each subnet, that is what the DHCP relay agent (ip-helper address in Cisco parlance) is for.

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                • #9
                  Re: Problems applying DHCP to a network that have different Vlans

                  One interface and one IPaddress is enough for a DHCP server.
                  With an IP helper address you tell the switch where he can find the DHCP Server.

                  Oh, IP-helper is not cisco only. Others (like HP) use this command to.
                  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

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