Server 1 (the first DC) has a static and primary DNS in the IP CONFIG should go to this IP.
Server 2, the second machine that you built, should have a static IP and the Primary DNS should be the IP of the First DC. Even though you have DNS on this machine, the DNS entries for AD and the other server are not going to be there until it joins the domain as a DC - assuming that the DNS is set up as Active Directory Integrated.
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