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Replace Windows 2003 DHCP Server RRS feed

  • Question

  • Hi guys, I have a single Windows 2003 DHCP server with 40 scopes and looking to migrate to a windows 2012 R2. Ideally I want to migrate with as little disruption as possible and I want the client machines to maintain the IPs they have as much as possible. As such, considering the following options. Advise, caveats etc most welcome:

    Option 1: Big Bang

    • Reduce all client scope lease to 1 day
    • Force renew of lease (using SCCM or otherwise)
    • Create a single Windows 2012 R2 Server with DHCP Role
    • At quiet time when minimal DHCP activity, export/import DHCP DB data
    • Turn off old 2003 DHCP server
    • Change IP on new DHCP to match old server (so don't have to change IP helper anywhere)
    • Done!

    Will this work? I was hoping this would amount to a straight upgrade

    Option 2: Migrate per scope

    • Reduce all client scope lease to 1 day
    • Force renew of lease (using SCCM or otherwise)
    • Create a single Windows 2012 R2 Server with DHCP Role
    • Use local firewall to block response to DHCP requests
    • Add new IP Helper on every VLAN
    • At quiet time when minimal DHCP activity, export/import DHCP DB data
    • Use a local firewall on old 2003 servers to block response to DHCP requests on a per scope basis
    • Open firewall on new server to allow it to service requests

    Wednesday, May 18, 2016 10:48 PM

Answers

  • Usually, similar activities are done outside of Business hours so that the change does not create disruptions.

    I usually  do what you call a "Big Bang" and just migrate the old server completely to a new one. However, the second option would be less risky but would require more time.

    Maybe it would be a good idea to plan this during the WE (I assume you have no one at work at that time) and progressively migrate and test your scopes.


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    Ahmed MALEK

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    Wednesday, May 18, 2016 11:36 PM

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