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Cleaning up AD and removing old DHCP servers

Question

Tuesday, July 22, 2014 2:38 AM

Currently we have 4 authorized DHCP servers. As part of checking AD / DNS / DHCP health, we found some old DHCP servers that were removed along time ago still showing up in the dhcpmgmt.msc console as authorized servers.

I used adsiedit.msc to view the following: CN=NetServices,CN=Services,CN=Configuration,DC=DOMAIN,DC=INTERNAL. Here I see entries for all the current authorized DHCP servers, and the old ones that don't exist.

I then had a look at the following using adsiedit.msc: CN=DhcpRoot,CN=NetServices,CN=Services,CN=Configuration,DC=DOMAIN,DC=INTERNAL. Here I see only 3 entries which are of the old DHCP servers which no longer exist.

Based on the above, I have a couple of questions.

  1. Why do I only see 3 entries in CN=DhcpRoot, all of which are old servers that don't exist?
  2. Can they be removed safely?
  3. Should we add the current DHCP servers into CN=DhcpRoot, as they don't show up now?

All replies (2)

Tuesday, July 22, 2014 9:28 AM

Hi,

I believe the following link would help you in the questions you have:

http://social.technet.microsoft.com/Forums/windowsserver/en-US/f93e64c9-2796-4a8d-b23f-7ae35d924693/dhcproot-in-adsiedit-should-it-be-empty

Hope this helps.

Thanks.

Calin

Wednesday, July 23, 2014 4:24 AM

Thanks for the reply.

Does anyone know if there is a Technet / Microsoft article explaining this behavior?