Prerequisites : Promote as server to Windows Domain Controller

1. Need to give proper computer name
2. Static IP should be configured
3. Disable windows Firewall. Recommended by Microsoft
4. If its the first and primary DC the DNS should be the IP of DC itself
5. You can add one of the DNS as 127.0.0.1

You may loose internet connection once you configure the IP and especially DNS. Connection will be back once the Active Domain services are created and DNS is functional

Now system is ready to add role of Active Directory