2 Windows 2003 Domain Controllers, 1 DHCP Scope?

Posted on 2007-07-24
Last Modified: 2011-09-20
Is it possible to have 2 domain controllers share the same scope?  We would like to implement some sort of fail safe in case one of the domain controllers would die.  
Question by:AzagThothe
    LVL 31

    Accepted Solution

    yes u can configure it like this

    Server1 has Scope
    Address Pool from: -
    Exclusions Range: -

    Server2 has Scope
    Address Pool: from192.168.1.126 -
    Exclusions range: -
    LVL 23

    Expert Comment

    But that wasn't sharing a same scope?
    DHCP server needs to be authorised before they can server clients. So if you setup DHCP on server2 using the same scope of server1, but leave it UNAUTHORISED - which means server1 will be your only DHCP server. If it dies, just go to server2 and authorise DHCP.
    LVL 4

    Expert Comment

    by:Mark Walden
    Are you running DHCP service on your DC's.  I would not recommend this.  Domain controllers are to important to the business.  DHCP does not require much overhead so i would get a midrange server to run this on.  I understand some business want to keep cost down, but the IT department is not the place to do it.  But back to you question, Merowinger is correct.  He is suggesting the 80/20 rule.
    But i would still put DHCP on another box.
    LVL 23

    Expert Comment

    But don't you think if server1 broke down, server2 will NOT give out the first lots of addresses?
    LVL 4

    Expert Comment

    by:Mark Walden
    Well, this is all a mater of opinion as how to set up failover for DHCP.  DHCP is a low power service that is free with the Server OS.  I guess depends on the size of your network.  For a small network I would suggest backing up the database to an external source nightly.  You would only need 1 server to run DHCP.  If the server fails, simply install DHCP on another server through Add/Remove Windows components and apply the database.  For a large net such as the one I work with, I have the DHCP database stored on a SAN with 2 Clustered boxes pointing to the database.  If DHCP1 fails, the cluster will fire up the DHCP service on DHCP2 and uses the same database.

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