DHCP Multiple Scopes RRS feed

  • Question

  • Hi Members,

    We Are Going To Deploy DHCP Server For Our New Building but having Below Requirement

    Building Have Three Floor and we have decided to run multiple scopes one scope for one floor for example

    172.16.25.X For Ground Floor

    172.16.26.X For First Floor

    172.16.27.X For Second Floor

    17.16.28.X  For Third Floor

    172.16.29.X  For Servers

    I am new in multiple scopes deployment but how can we /distinguish and assign all computer get IP from 25.X from Ground Floor , 26.X For First Floor and Further on For Different Floors

    Pls Let me know


    Saturday, June 7, 2014 7:59 AM

All replies

  • The best way how to control the IP assignement is reservation. IP  reservation is based on MAC address that is unique identification (one part of MAC address is based on well known identification number of network card vendor and second part is the "order" in production series ).

    If there is  router in your network, then it should support protocol that enables spread assignment into all subnets. (BOOTP)

    Alternatively you can use virtual networks to isolate traffic (VLAM).

    For large (extent) networks there are multiple DHCP servers in subnets.



    Saturday, June 7, 2014 9:16 AM
  • Hi,

    The DHCP request packet will contain something called a gateway IP address (GIADDR). This is added by the relay agent when it forwards the DHCP request from a client to the DHCP server on a different subnet.

    See http://technet.microsoft.com/en-us/library/cc779610.aspx

    If the DHCP request arrives from a relay agent and not a broadcast, it will contain the GIADDR and the DHCP sever will issue an IP address from a scope that matches the subnet mask and network ID of the interface on which the DHCP request originated.

    Basically if you have a router with an interface of that is the default gateway for your ground floor, then the DHCP server will know to use the 172.16.25.x scope for requests that came from that interface.


    • Proposed as answer by Vivek Dadu Monday, June 9, 2014 6:26 AM
    Saturday, June 7, 2014 1:10 PM