splitting dhcp scope

Discussion in 'Server Networking' started by Joey, May 19, 2009.

  1. Joey,
    1) Each Scope is one subnet e.g. The Address Pool is the part
    of the subnet you want to use for clients (in your case .50 - .254).
    Exclusions are any part of the Pool you can't use.
    2) Each DHCP server is one one subnet
    3) Each DHCP server has all scopes
    4) Each DCHP server uses reciprocal exclusions. So one might exclude .50 -
    ..150 and the other will exclude .151 - .254 This way both servers service
    every subnet, but can not assign duplicate IP's
    5) Each client VLAN must have an IP Forwarder address configured so that
    DHCP requests are forwarded to the DHCP servers

    Hope that helps,

    Anthony [MVP], May 20, 2009
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  2. THe way I showed you seems to be appropriate. As said, you may need to expand it to a larger subnet for each VLAN to elegantly offer enough IPs so one server can handle it when you have two splitting the scope.

    As for giving out IPs to the multiple subnets, use IP Helpers on your layer 3 switches using the DHCP relay agent.

    The idea is to look at recovery time of your server, or how fast you can simply replace it. Do you have a DR plan? Have you explored this area of recovery? I understand you are looking at clustering, NLB, etc, but a DR sounds like is what you need here as well.

    Ace Fekay [Microsoft Certified Trainer], May 20, 2009
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  3. Out of curiousity, what subnet mask are you using for those?

    Ben M. Schorr, MVP
    Roland Schorr & Tower
    Author - The Lawyer's Guide to Microsoft Outlook 2007:

    Ben M. Schorr - MVP (OneNote), May 20, 2009
  4. Joey

    Joey Guest

    they are

    Joey, May 21, 2009
  5. You do realize that Ethernet looses efficiency after round 250-300
    hosts,...so subnets should not go beyond the normal 245 host

    Lower bit masks are for supernetting within routing tables.

    Phillip Windell

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.

    Phillip Windell, May 21, 2009
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