Domain Controller and a secondary IP address

ClintWeldon
ClintWeldon used Ask the Experts™
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We are trying to reduce the number of DC's we have in our domain.  We have one DC that has been around for ever with the same IP address. Lots of "other" devices point to that IP.  We want to decommission the server as well as the IP address but this could potentially have an impact on many unknown configurations.  The question is, would it be safe to add this IP address as a secondary IP on one of our new DC's that is configured as a DNS/WINS/Time server?  
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Top Expert 2013
Commented:
No you can't put that IP as a secondary IP of a current DC.   What you can do is standup a new box and "re-use" that IP address.

Thanks

Mike

Author

Commented:
I didn't think so.  Would there be any documentation on this?  I haven't been able to find anything.
If you are using DHCP it is not a problem.

if you have assigned static IP - you have to manually change DNS entry for them
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Author

Commented:
Yes, i understand that aspect, the manual changing of the devices.  However, my question is around documentation on why you wouldn't want to have a secondary IP address on a DC to answer to devices that might be configured for that IP address.  I know from years of dealing with AD replication and other things, that it could cause problems, but I need some documentation to justify for my team why I am going to make them go and manually change all their stuff.  We are not going to use that IP address, it is going away.  
Top Expert 2012

Commented:
I would have to agree with Mike no you can not do this without causing problems.

Author

Commented:
Thanks for the guidance. Can you guys point me to any technical documentation on this?  
Top Expert 2012
Commented:
No documentation that I know of that directly points to having multiple IPs on one interface would cause an issue but there are documents that state that multiple IP addresses or multihomed Domain Controllers can have DNS related issues which cause AD issues.

You can only register one IP address on a domain controller this is common knowledge you can not have multiple IP addresses registering in DNS for a DC.

Author

Commented:
Yes, I agree.  Thanks for the information guys.
Top Expert 2013

Commented:
There was also a similar thread about reusing over at activedir

http://www.activedir.org/ListArchives/tabid/55/forumid/1/postid/42855/view/topic/Default.aspx

listmail  = joe Richards = my idol :)

Thanks

Mike

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