AD Integrated DNS Change - Can I do this?

Hello AD Experts,

I have a question that I think I know the answer to, but I want to ask it anyways.  I have a Windows Server 2003 domain with a total of four domain controllers.  Active Directory integrated DNS is running on each domain controller.  The IP addresses of the domain controllers are as follows:
DC-A – 172.16.100.2
DC-B – 172.16.200.2
DC-C – 172.16.300.2
DC-4 – 172.16.400.2

The DNS on all workstations and member servers is set as follows:
Primary DNS:  172.16.100.2
Secondary DNS: 172.16.200.2

DC-A is experiencing some issues and we want to take it offline.  My plan is to demote the domain controller to a member server, change its IP address to whatever and then join it to a workgroup to get it out of the domain.  My question is can I then assign DC-4 the address of 172.16.100.2 so I don’t have to change any DNS settings?  I can’t see why this would be a problem, but I wanted to throw the question out there.

Thanks in advance for all of your help.

Regards,
Nick
LVL 1
ndalmolin_13Asked:
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Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
Yep, that works fine.. just make sure DC-4 has all the records you see on DC-A.
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yo_beeDirector of Information TechnologyCommented:
I know this is a DNS question, but I also just want to bring to the attention of the FSMO roles.
If DC1 has them all make sure that they are transfered prior to demoting.

http://support.microsoft.com/kb/324801
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SysExpertCommented:
In addition, after demoting and FMSO transfer, you may want to clean up the DNS before changing the IP.
Also double check the AD to make sure that there are no site to site issues.



I hope this helps !
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