W2012 R2 Doman Controller cannot be founb

I just fired up a W2012 R2 domain controller and when I went to add some workstations to the domain they all come back saying the specified domain controller cannot be found. Is there some default domain policy that defaults to negative that is causing this? What should be the first thing I should check on the domain controller to get it to be seen by the workstations?
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Did you check address of DNS server in DHCP?
What DNS server IP address workstations get?
And also, is default gateway OK, if DC is not on the same subnet?

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rwheeler23Author Commented:
In this case I am setting up a test domain controller and workstation outside of our domain. Having said that, you were right. Setting up DHCP correctly resolved this issue.
rwheeler23Author Commented:
Your tip reminded me of what had to be done. Thank you.
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Windows Server 2012

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