2nd domain inside existing domain -- Windows 2012 ?

I currently have all of my devices on the 192.168.50.x network, including my current "company.root.tld" DOMAIN on 192.168.50.10

Can I create a new "newCompany.newRoot.tld" DOMAIN on a 2nd Windows 2012 HyperV using the available 192.168.50.20, with DHCP disabled and slowly move the 10 PCs I have over to the new domain one-at-a-time, with the machines still getting DHCP IPs from the old 192.168.50.10 until I have everyone moved over, then enable DHCP on 192.168.50.20 ?

If not, what do you recommend since I just want to get everyone to a BRAND-NEW domain, recreating AD Groups and individual FileServer folder group permissions ?
finance_teacherAsked:
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Cliff GaliherCommented:
Well, first, I think you mean that you have domain CONTROLLERS at those IP addresses. Domains are entities without a single IP address, technically speaking.

Which matters because, no, you cannot do what you want the way you describe.  Clients need to be able to find a domain controller to work on a domain. If the DHCP server has data out DNS entries for the old domain, new machines getting addresses via DHCP won't work. If you configure DHCP to give out new DC addresses for DNS, machines still OK the old domain and on DHCP won't work.

And you can't have two different DHCP settings for old and new. At least not easily.

You can manually configure IP settings and not use DHCP during the transition. Or you can split your network so they aren't on the same broadcast domain  (as in layer 2 OSI model terms, not to be confused with active directory domains) as separate LANs or VLANs. But regardless it'll be a different and not seamless approach.
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finance_teacherAuthor Commented:
I am almost 100% sure I did this before, just making all the machines on the "newCompany.newRoot.tld" have a STATIC "DNS" server that was the "newCompany.newRoot.tld" server, still allowing all machines on both domains to get DHCP issued from the old "company.root.tld" DHCP server until I sunset it

Could that be possible ?
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Cliff GaliherCommented:
Yes, and my answer did say as much. I addressed DHCP giving out DNS settings. If you configure that static settings, it isn't fully utilizing DHCP.Which Kay be fine in your situation, But that does still require touching each machine and disabling DNS settings via DHCP, and then touching each machine AGAIN TO re-enable it later after the conversion is done if that is ever desired.... Which can be particularly troublesome, error prone, and labor intensive. I'd usually say a second LAN is cheaper since unmanaged switches can be had very inexpensively. Plus  if any of the machines are laptops, that's an added headache.  If they ever go off-site, they cannot pull DNS from any public Hotspot or home connection they are Roaming on.
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masnrockCommented:
No, you actually can't do it in the exact way that you want to in your question UNLESS you allow every single machine on the network AD domain to have static addresses until you've disabled DHCP on the old DHCP server. I am assuming this is for the same educational environment that you've posted questions on in the past, which would mean that you have a minimal number of machines ever leaving the campus. I agree with Cliff's commentary that a separate LAN/VLAN would actually be more appropriate if you're intended to let both domains operate for a period of time, especially while school is in session. Otherwise, I'd wait until school is out for the summer to get the project done.
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