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My experiences with migration from W2K3R2 to W2K8R2 domain & forest

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  • My experiences with migration from W2K3R2 to W2K8R2 domain & forest

    Last week we migrated our domain/forest from windows 2003 R2 to Windows 2008 R2. I thought i share my experiences with you guys.

    DFS
    We had some issues with creating DFS domain namespaces. It seems that after installation we could create a windows 2008 namespace type. The enable windows 2008 mode was greyed out. Solved this by rebooting every domain controller that was used to hold the domain namespace.
    The second issue we had with DFS is that we could not create new DFS namespaces since there we still old DFS namespaces residing in active directory. To resolve this issue I found this article
    http://developers.de/blogs/ivan_luci...available.aspx

    DHCP
    We needed to migrate our DHCP servers from windows R2 to Windows 2008 R2 as well.
    We did this by using the netsh dhcp server export and import commands. DO NOT use these commands to migrate your DHCP Server. We had serious problems since it didnít migrate our reservations well and ended up with a corrupt DHCP Database. I also read various threads across the net that said the same. Use the following procedure to migrate it :
    http://technet.microsoft.com/nl-nl/l...35(WS.10).aspx
    There is another issue I found with a Windows 2008 R2 DHCP that is not documented. It is not possible to create a reservation anymore in a scope that holds an ip address that is not used in that scope. For instance you have a scope from 10.10.10.1 to 10.10.10.100 and you want to create a reservation for a PC that needs IP 10.10.10.101. You get a nice error warning that this is not possible. Quite annoying for us since it was supported on a Windows 2003 R2 DHCP Server.

    DNS WPAD
    We have an ISA 2006 in our environment and after we migrated our domain to Windows 2008 R2 all PCís that had an ISA Firewall Client could not connect anymore to that ISA Server.
    We got a warning : Could not detect ISA Server.
    After investigation this we found out that Windows 2008 R2 DNS Services had a new feature called DNS Block list. The wpad entry was blocked by default so that was the reason that the Firewall client could not connect. You must remove the wpad entry from that block list.
    http://technet.microsoft.com/en-us/l.../cc995158.aspx
    http://technet.microsoft.com/en-us/l.../cc995261.aspx

    Hope this helps people out there.
    BioÖ

  • #2
    Re: My experiences with migration from W2K3R2 to W2K8R2 domain & forest

    Thanks for sharing Bio,

    I am sure someone will find this useful.
    Also, interesting about the reservation outside the DHCP scope range.
    As you said, previously this was possible as long as it was within the subnet range!!
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