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

Posted on 2004-03-31
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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.
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Question by:ccallison
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12 Comments
 
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Expert Comment

by:Pete Long
ID: 10726774
whats in your DNS forward lookup zone?
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Expert Comment

by:Pete Long
ID: 10726780
i.e. is there an entry for the WRONG IP address?
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LVL 57

Expert Comment

by:Pete Long
ID: 10726792
also make sure this reg key (on the DHCP server) has a value of 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DisableDynamicUpdate

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LVL 57

Expert Comment

by:Pete Long
ID: 10726800
oops wrong! should have a value of 0
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Author Comment

by:ccallison
ID: 10729127
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.
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Accepted Solution

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Pete Long earned 50 total points
ID: 10732845
AD is 99.9% dependant on DNS, either set up scavenging on your forward lookup zone or manually delete the old entry.
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Author Comment

by:ccallison
ID: 10736704
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.
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LVL 2

Author Comment

by:ccallison
ID: 10736864
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.
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LVL 57

Expert Comment

by:Pete Long
ID: 11493873
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
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