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  • Backup DHCP

    HI All,

    Sometimes my DHCP server not responding and problem with client connection.

    I found some infor about setting up second DHCP Server like this

    If you have an existing DHCP Server that hands out IP Address
    leases for, say, 192.168.1.1 - 192.168.1.254 ( with 192.168.1.1 -
    192.168.1.30 not available ) then all you need to do is to go in and change
    the available range to 192.168.1.1-192.168.1.200 ( or so ). Then stop and
    start the DHCP Services. Then add the second DHCP Server and make that one
    responsible for 192.168.1.201-192.168.1.254.

    But with my DHCP its bit hard to devide into 2 range.

    But is that possible to do with DHCP Relay agent? Or anyother way if my DHCP server stop giving the ip's my client.
    AusNetIT Solutions

    Web Design | Web Hosting | SEO | IT Support

  • #2
    Re: Backup DHCP

    Hi Cosy,
    First I would like to clear you that you can use two Dhcp server. You can use two Dhcp server for load balancing, fault tolerance and for reliability. For load balancing you either define 80% of addresses on one server and 20% of addresses on another or you define 50% on one and 50% on another.
    If I am hosting 10.0.0.1 to 10.0.0.255 and If I am using 50%-50%. Then, I'll define scope of 10.0.0.1 to 10.0.0.123 and exclusion range from 10.0.0.124 to 10.0.0.254 in one server and on another server i'll define scope from 10.0.0.124 to 10.0.0.254 and exclusion from 10.0.0.1 to 10.0.0.123.
    This way I am doing load balancing with my DHCP servers. As far as I know, We can use DHCP relay agent to forward allocation of ip addresses and request for ip addresses from routers but can not use for load balancing.

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    • #3
      Re: Backup DHCP

      HI,

      Thanks, If i create 2 DHCP like that and if i exclude all the servers in first DHCP
      then how do i set second DHCP for all my client?

      I create Virtual Server for my second DHCP

      how this work? What happen to current leases?

      I got 192.168.1.1 to 192.168.1.254 for address distribution and few exclutions
      so how do i create 50% 50%? need to delete? is this make any problems?
      AusNetIT Solutions

      Web Design | Web Hosting | SEO | IT Support

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      • #4
        Re: Backup DHCP

        COSY, how many DHCP clients do you have?
        Do you know why your DHCP server doesn't respond? <- this should be your focus
        What is your subnet mask?


        If you can, exclude the addresses that you want your second DHCP server to hand out from the scope on the first server, wait for the leases to expire, authorize the second server, configure and activate the scope on the second server.
        Regards,
        Jeremy

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

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        • #5
          Re: Backup DHCP

          HI,

          I got 75 client base in main office. Somehow reason it's not respond and getting the DHCP from next office . They have connect to our web server for maintenance and backup.

          I don't know why my main Windows 2003 DHCP is not responding?
          AusNetIT Solutions

          Web Design | Web Hosting | SEO | IT Support

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          • #6
            Re: Backup DHCP

            Originally posted by COSY View Post
            I got 75 client base in main office.
            You could then add an exclusion from 192.168.1.143 - 192.168.1.254, wait for the leases to expire then configure the new server.


            Somehow reason it's not respond and getting the DHCP from next office .
            So the clients are getting a response from a DHCP server, just not the proper one?


            They have connect to our web server for maintenance and backup.
            What kind of connection? What router do you use? Is the router relaying the DHCP requests?


            I don't know why my main Windows 2003 DHCP is not responding?
            This is what you should be trying to find out.
            Maybe use something like wireshark to see if it's getting two responses from a dhcp server. The client go with the first server to respond.
            Regards,
            Jeremy

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

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            • #7
              Re: Backup DHCP

              Thank you so much.
              AusNetIT Solutions

              Web Design | Web Hosting | SEO | IT Support

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