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Windows Server 2008 R2 Thread, DHCP Migration in Technical; Hi I have just migrated my 2003 DHCP server to 2008R2 and Clients are taking just over a minute to ...
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    DHCP Migration

    Hi

    I have just migrated my 2003 DHCP server to 2008R2 and Clients are taking just over a minute to get an IP Address when i do a ipconfig /release /renew

    A error will also come up saying "An error occured whiloe renewing interface Local Area Connection : Unable to contact your DHCP server. Request has timed out.

    If i then do a ipconfig /all it does get an ip address.

    Has anyone had this before??

    Clients are XP pro SP3

    Thanks Everyone
    Last edited by techie08; 31st May 2011 at 03:26 PM.

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    bart21's Avatar
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    What procedure did you use to move dhcp. Have you unauthorised the old dhcp server

    Nick

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    Hi

    I used the 2008 R2 migration tools to migrate DHCP. I havent unauthorised DHCP in the 2003 DC yet though, i just stop the DHCP service. Is this something i definatly need to do???

    Thanks

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    i posted in wrong thread, sorry

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    bart21's Avatar
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    i would try it, you can always re autherize again if neccessary.

    It may be looking for that server first as it is still autherised, then when it times out looking for that server picks an address up from the new one.

    nick

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    Tried that but its still the same. I Just found out that imacs aren't getting an IP Address at all.

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    Ive just deactivated the 2008r2 DHCP scope and reactivated the 2003 one and it assigns an IP really quick, iMacs also now get an IP.
    Does anyone have any thoughts?

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    I have uninstalled DHCP from 2008 r2 and reinstalled it and created the new scope and it works perfectly. Looks like there was something that went wrong with the migration.

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    Quote Originally Posted by techie08 View Post
    I have uninstalled DHCP from 2008 r2 and reinstalled it and created the new scope and it works perfectly. Looks like there was something that went wrong with the migration.
    Doesn't fill me with confidence for when I have to migrate!

    Did you use these commands to do it?

    http://technet.microsoft.com/en-us/edge/Video/ff710739

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    Yes i did, Exactly how it explained.

    Not sure if it would of been better to install the DHCP role first then migrate or if was an issue with my 2003 DHCP in the first place that 2008R2 didn't like

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    Did you stop the services on both before the import? In theory it shouldn't make a difference whether the role was installed as it's meant to do it as part of the migration process although I'm paranoid and will probably do it manually when it comes to it.

    Btw did you use the IP migration switch as well or did you have a new address for the new DHCP server?

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    Quote Originally Posted by gshaw View Post
    Did you stop the services on both before the import? In theory it shouldn't make a difference whether the role was installed as it's meant to do it as part of the migration process although I'm paranoid and will probably do it manually when it comes to it.

    Btw did you use the IP migration switch as well or did you have a new address for the new DHCP server?
    No i had a new address for the server. To be honest it may be just as easy to start fresh. When i did, it cleared out the DNS entries and put them back in when it got an ip from the new DHCP server.

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    I just migrated scopes from a handful of edge domain controllers back to a single server, but they were both 2003 R2 boxes. I used these commands at the command line to do it...

    To export the scopes along with the leases:
    netsh dhcp server export "filename" "scope to export"
    ex: netsh dhcp server export Site01.DHCP 10.1.64.0
    To import the scopes along with the leases:
    netsh dhcp server import "filename" "scope to import"
    ex: netsh dhcp server import Site01.DHCP 10.1.64.0
    I didn't have to down the DHCP server service during the process either. Don't forget to change IP Helper addresses in core switches where needed too.

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