LDAP and Active Directory

Expertout out there need help on LDAP.
I am going to demote a domain controller since its hardware is old.
The problem is that this server is being used for LDAP applications.
My plan is to install a new server and promote as DC and retire the old server.
I do not know whether it good idea to change the IP. I am sure I can not change the name if DC.
Any advice on this would be appreciated.
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sara2000Asked:
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MaheshArchitectCommented:
how your applications are configured to lookup LDAP server ?
with hostname or IP address?
You can get answer youself
The other best way around is to promote server with new IP and new hostname and then demote old server and rename new DC hostname to match old one and also set old IP with new DC to avoid issues
DC rename process:
https://www.petri.com/rename-windows-server-2008-domain-controllers
https://support.microsoft.com/en-us/help/2001271/domain-controller-rename-does-not-rename-all-ad-dfsr-sysvol-objects
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sara2000Author Commented:
Why do I have to rename it?
Can I demote it and remove the server from AD
Then  install Windows 2012 R2 with the same name and IP as the old and promote  it?
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MaheshArchitectCommented:
yes you can do that as long as you don't have any dependency on old hostname and IP, otherwise after demoting old server, you will face outage / issues
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sara2000Author Commented:
The outage will be only when I demote old server. It should be backup to normal once I promoted the new server with old server name an dip , am I correct?
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MaheshArchitectCommented:
if new server build up normally without any issues, nobody come to know, however if it's promotion fails or having issues, you need sufficient time to roll it back or at least resolve issue you got
hence I suggested to build new server with new hostname, ip, ensure it's functioning as expected and then   demote old server and rename new server hostname to match old server hostname and ip as well

still if u r enough confident to demote old one and promote new one with same hostname and ip, u can do that , but do it during off business hours or night
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Shaun VermaakTechnical Specialist/DeveloperCommented:
I do not know whether it good idea to change the IP. I am sure I can not change the name if DC.
If that is a concern, double bind the IP to the new server and add the new name as an extra computer name with NETDOM ComputerName
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