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Ghost DNS Entry

Posted on 2009-05-12
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Last Modified: 2012-05-06
I recently formatted a test server that was part of my domain(mydomain.com).  It had an IP of x.x.x.183.  This address was given by our DHCP server that had a reservation created for it.  I reloaded the machine(testdc) and promoted it to a DC in a new domain(test.com).  I deleted the DHCP reservation and static assigned it the IP address of x.x.y.110.  I also added 3 workstations to the domain(test.com).  

testdc - x.x.y.110
test01 - x.x.y.111
test02 - x.x.y.112
test03 - x.x.y.113

From my PC in mydomain.com, I can ping all three workstations by typing "ping test01" from a cmd prompt.  If I type "ping testdc", I get the machines old IP of x.x.x.183 and the ping fails.  Mydomain.com has 2 DNS servers.  I have checked both of them for any records with an IP of x.x.x.183.  There isn't one.  Also in the reverse lookup zones, all 4 test machines are listed with the correct IP's.  There is no records for those machines in the forward zones.  On the DNS servers and my workstation I have performed a "ipconfig /flushdns".  I have also highlighted each of the DNS servers in mydomain.com, right clicked and then selected 'Clear Cache".  

I am hoping to find out what I am missing.  Where this record or old IP is still being referenced.  Thanks in advance.

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Question by:RHNOC
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Chris Dent earned 1000 total points
ID: 24372583

When you pinged it... did it append the domain name?

e.g.

Pinging testdc.domain.com [x.x.x.183]

Or did it just run show this:

Pinging testdc [x.x.x.183]

If it's the latter to suggests that the IP address is the result of a NetBIOS Broadcast or a Lookup on a WINS server. The latter being more likely if the server is no longer active. Do you use WINS? Have you checked the records there?

Chris
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Author Comment

by:RHNOC
ID: 24376045
I do have WINS enabled on both DC's for mydomain.com.  I checked WINS and it is listed there.  The old Server name and New server name are both listed.  Their State is "Released".  I clicked on Scavenge Database and now the records are "Tombstoned".  Should I manually delete or wait for them to behandled automatically by the parameters set on the server?  Thanks for all of your help!  
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Author Comment

by:RHNOC
ID: 24379581
I am now able to ping the server by its name(testdc).  The records still show "Tombstoned" but I think they will be removed after a set period of time.  Thanks for your help.  
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