DNS name conflict - Windows

Hi All,

I'm trying to install a new Windows 2008 forest in our existing corp network in preparation for a migration.  Our existing corp network is Windows 2000,  and the domain is ourcompany.com.  I want to name the new 2008 network ourcompany.local.   But dcpromo is telling me I can't because of a name conflict.  Why is that?  Isn't the .com and .local completely different?  The ourcompany.local does not currently exist anywhere in the DNS server.

Any ideas how to get around this?


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Not easily. Unfortunately windows STILL uses netbios naming in certain areas so ourcompany .(anything) will shorten to OURCOMPANY for the purposes of netbios. Your other option is to do something like INTERNAL.OURCOMPANY.COM or pick a different name.

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Mike KlineCommented:
Netbios is the reason as FC mentioned.   You could install a brand new forest called ourcompany.local but not a domain in the same/current forest.
...however you may have a name conflict when trying to creat the trust.
Are you just trying to upgrade your DCs to 2008.  You could just install them in the same domain and AD will replicate to them...plenty of guides on that.
Adam BrownSenior Systems AdminCommented:
Well, the trick is that you have to give it a DNS name and a Netbios name (still), and the netbios name is whatever is before the next highest domain level. So in bob.jones.com, the Netbios is bob, and in jones.com it's jones. You just need to change the NetBIOS name that is chosen during DCPromo. something like ourcompanyad or something like that. You can use the DomainNetBiosName: switch when you run DCPromo to set that. I haven't run DCPromo in a while so I can't remember if the GUI let's you set the NetBIOS name or not. http://technet.microsoft.com/en-us/library/cc732887%28WS.10%29.aspx has an explanation of all the command line switches you can use with it, though.
Theo1972Author Commented:
We're both upgrading to new server hardware and the OSs (2000 to 2008).  So I can just add a couple of Windows 2008 DCs to the existing Windows 2000 domain and all the AD will replicate over properly?


Theo1972Author Commented:
Thanks for all your help.

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