have a dc that needs to remain dns server but not Active Directory services

i have replaced all dcs with 2012
however i have 1 remaining dc running 2008 that i need to demote
this domain controllers ip has been used as a dns server for an old bit of kit that cant be changed
i need to keep this server as a dns server but not active directory
how can i do this
can i just demote it and then reinstall dns as a secondary zone or something
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dougdogAsked:
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Yes, you can demote and then add the zone as a secondary... but how about demote the server, then add the IP to one of the new domain controllers?

That way you don't have to manage zone transfer settings and maintain an extra server.
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asavenerCommented:
Personally, I'd avoid a multihomed domain controller.

Either put a full DC at the IP address, or a DNS server with the AD zone as a secondary zone.
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Personally, I'd avoid a multihomed domain controller.
No need to multihome. Just add the IP to the existing adapter.
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Will SzymkowskiSenior Solution ArchitectCommented:
When you demote the 2008 DC the DNS server role is still in tact. However if you still want this machine to act as a DNS server (non AD integrated) you need to make sure that that IP is added to the Zone Transfers to all Zones that you want to make available.

If you do not add the IP to the Zone Transfers Tab then updates will not work, they will fail.

Will.
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dougdogAuthor Commented:
so as soon as I demote the server it will still act as a dns server?
does dns stay on server and serve requests
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Yes, it will still respond to requests but when you demote it, the zone will be removed.

If you want to keep the server and not assign the IP address to another DC, you can:
- Configure the forwarders on the server to point to other DNS servers and remove any others
- Demote the server

No need to set it up as a secondary as it will forward all it's requests to the forwarders you've configured. If DNS performance becomes an issue you could then set it up as a secondary.
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dougdogAuthor Commented:
what exactly is a multi homed dc?
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Multihomed refers to having two network connections on a computer.
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dougdogAuthor Commented:
I want to keep server for 6 months
I want it to function as discussed but no Ad
So I can promote functional level and have no 2008 dcs
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asavenerCommented:
No need to multihome. Just add the IP to the existing adapter.
Yeah, my reluctance extends to DCs with multiple IP addresses.  


Another option would be not to configure any zones on the DNS server, and just set it up to forward to your domain controller.  Then you don't have to worry about zone transfers and the like.

(After some consideration, this is what I'd do in your case.  Doesn't even have to stay as a Windows box.  A simple Linux distro with BIND would accomplish this, and you don't have to worry about licensing issues.)
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dougdogAuthor Commented:
How do I set it up to forward
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Open the DNS console
Right-click the DNS server and select Properties
Click on the forwarders tab.
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dougdogAuthor Commented:
Oh yes  so I can still do this even I have demoted the server
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Correct.

This is what I would recommend if you want to keep this server online.
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dougdogAuthor Commented:
Ok and when I want to get rid of it I can use the multihomed method
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
When you want to get rid of the server, if you still need a DNS server at that IP address, you can configure it to another DNS server. This is not multihoming.
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Will SzymkowskiSenior Solution ArchitectCommented:
Do not multiple home a domain controller. If you do you will also need to make sure that you check the listener IP addresses in the DNS configuration on that server. By default DNS will listen on all IP addresses. So if you do not want this you will need to remove them from the listener setting.

Will.
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