Changing the IP address on a domain controller

Step-by-step instructions for changing the IP address on an AD domain controller, as well as a method to make sure it is resolving properly after the change.

Changing your IP address on an Active Directory domain controller can cause many issues with the DNS server on that machine. To change the IP address, complete the following steps:

Select:    Start -> Settings -> Network and Dial Up Connections
Select:    Your Local Area Connection
Select:    Internet Connections (TCP/IP) Properties
Change:    Your IP Address and Subnet Mask and Gateway 
Change:    Preferred DNS server's address to the new server address
Select:    OK -> OK -> Close

Your server's address is now changed.

Select:    Start -> Programs -> Administrative Tools -> DNS
           
Double click Forward Look Up Zones. Then double click your server name.

Delete:    Your type A records

Reset your information in your SOA and NS records and exit DNS. Now drop down to an MS-DOS prompt and type the following: 

ipconfig /flushdns Enter
Net Stop DNS  Enter
Net Start DNS  Enter 
Net Stop Netlogon Enter
Net Start Netlogon Enter

ipconfig /registerdns Enter

You can now go back to DNS and make sure the records were all created and they should have changed the address to the correct address on their own.

Now run NSLookup from an MS-DOS prompt and see if all is resolved OK or not. It the names and IP addresses all resolve correctly, you're all set. If not, then go back to NSLookup and type set root=servername (the name of your DNS domain) and hit Enter. When the prompt returns, type exit to exit out of NSLookup. When you type NSLookup, it should resolve the name correctly.

This was first published in September 2003

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