We help IT Professionals succeed at work.

Check out our new AWS podcast with Certified Expert, Phil Phillips! Listen to "How to Execute a Seamless AWS Migration" on EE or on your favorite podcast platform. Listen Now

x

Old IP address of AD DHCP server keeps returning when I open the DHCP MMC....

ccallison
ccallison asked
on
Medium Priority
490 Views
Last Modified: 2010-04-13
Can someone please tell me where this value resides in AD?  I've unauthorized and re-authorized my DHCP server just like the MS Q-note suggests and the server continues to pop up with the old IP address when I use the "Manage authorized servers".  (btw, it shows two entries for the server; one correct and one old).  It happens even when I am on a machine where I have never used the DHCP MMC, so it's not a locally saved value.

I've tried searching the AD database using ADSI, but no luck so far.  More of an annoyance than anything else.
Comment
Watch Question

Pete LongTechnical Architect
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
whats in your DNS forward lookup zone?
Pete LongTechnical Architect
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
i.e. is there an entry for the WRONG IP address?
Pete LongTechnical Architect
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
also make sure this reg key (on the DHCP server) has a value of 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DisableDynamicUpdate

Pete LongTechnical Architect
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
oops wrong! should have a value of 0

Author

Commented:
I think you're way off, Pete.  The DHCP server is the DC and it is correctly registering itself in DNS, both forward and reverse.  There are two entries listed,  both with the name of the DHCP server - one is the correct new address and one is the incorrect old address.  It is being queried by the DHCP MMC tool from somewhere in AD, not DNS.
Technical Architect
CERTIFIED EXPERT
Distinguished Expert 2019
Commented:
Unlock this solution with a free trial preview.
(No credit card required)
Get Preview

Author

Commented:
Scavenging is already turned on for all forward and reverse zones and there IS no old entry.  DNS is correct.  I have run both DCDiag and Netdiag and found no errors.  AD is highly dependent on DNS as a locator service for many functions( finding PDC, GS, site subnet assignments, etc.), but the admin tools often query the AD database through LDAP directly.

Author

Commented:
Okay, I found a way to remove the old entry, but it still doesn't satisfy my curiosity as to where this value was being held.

In the DHCP MMC, if you have the correct address open and under management, then reselect "Manage Authorized Servers" and then highlight the offending entry with the legacy address and select unauthorize.  It doesn't seem to affect the running service on the new address.
Pete LongTechnical Architect
CERTIFIED EXPERT
Distinguished Expert 2019

Commented:
comment from pete 04/01/04 0436 hrs GMT: or manually delete the old entry
reply >>there IS no old entry
2nd reply >>Okay, I found a way to remove the old entry

Bizaare
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a free trial preview!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.