Joining three separate domain controllers into one domain controller


Not very experienced in migrating and or restructuring Windows Domains.

I have three separate domain controllers.  Two are Win Serv 2012 R2 and one Win Serv 2008 R2.  They each have different domain names name1.local, name2.local, name3.local.  Is it possible to move all three onto another Win 2012 R2 Domain Controller with newname.local? And have the user accounts from the old domains work the same in the new domain?

Thanks for any help!

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Are the three organization joining becoming one firm?
You could choose one to be the remaining, and establish trust relationship between them.

Are you planing on having/retaining all three domain logins/setup?
ChadHsrnAuthor Commented:
Couple notes I forgot to add.  We would like to have the three old domain controllers remain at those locations as domain controllers that have the Global Catalog and the new domain controller will have Global Catalog and FSMO roles.

ChadHsrnAuthor Commented:
We want the three to be in one single domain.  I've been told we need to avoid using trust relationships between them.  Ultimately we would have on domain login that would work at all sites.
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Helao MwapangashaData Centre: Server EngineerCommented:
you will need to have a trust relationship first  you them migrate the primary roles to a new DC that can service all log on attempts from all 3 domain. you then   enable the old servers as global catalog.

if you want the users in the other domain to log onto the new domain, there should be a trust or u must have those domain as sub domains.

but in order to have the fsmos transfer, there should be a trust
Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
I would suggest the following:

1.  Break trust relationships
2.  Rename one of your domains to the new domain you would like
3.  Establish trusts between the newly renamed domain and the other two domains
4.  Using ADMT, migrate all objects from the other two domains to the newly renamed domain
5.  Make changes to your DHCP server to ensure the desired DC is listed as the DNS server and the new domain name is set as the default suffix.  Ensure to do the same for the servers/devices with static IP addresses
6.  Run DCPROMO and demote the two domain
7.  Run DCPROMO and promote the two servers to become DCs in the new domain
8.  You could now use the newly created DCs as DNS servers locally at each site

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ChadHsrnAuthor Commented:
Thanks for the ideas!! I am going to run this on my lab.
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