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DNS Forward Lookup Zone IP Addresses incorrect

Posted on 2013-01-28
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Last Modified: 2013-03-09
Looking at DNS on my two domain controllers, if I go into the Forward Lookup Zone, I see I have 54 records, but the 'Name' column has old info that isn't current with the 'Data' (IP) column.

For instance, my laptop's IP address, from DHCP, is nnn.nnn.nnn.41.  In the forward lookup zone the name given for that IP address is not my laptop.  It's an old computer that doesn't exist any more, as far as I know.

Yes, I am not a DNS expert.

Also, interestingly, I have a DHCP reservation for nnn.nnn.nnn.111 and that matches up in the Forward Lookup Zone with that IP and the correct machine... BUT, if I ping -a the .111 it returns a different computer name.

Do I need to clear some cache or flush something to get that all sorted out in the servers?
I don't want to hose up any user's access or screw up the running systems.

Thanks...
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Question by:bs_ssg
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6 Comments
 
LVL 57

Expert Comment

by:Pete Long
ID: 38828868
Set up scavenging on the DNS Server and the zone http://technet.microsoft.com/en-us/library/cc755716(v=ws.10).aspx
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Author Comment

by:bs_ssg
ID: 38828946
Thanks for the link.  I'll have to look into that.  However, this is in the text at that link:

 Caution

    By default, the aging and scavenging mechanism for the DNS Server service is disabled. Enable aging and scavenging only after you understand all parameters. Otherwise, the server could be accidentally configured to delete resource records that should not be deleted. If a resource record is accidentally deleted, not only will users fail to resolve queries for that resource record, but any user can create the resource record and take ownership of it, even on zones configured for secure dynamic update.

That's kinda scary to me.  If I somehow hose up a B2B VPN we have setup with a customer.. I could be severely killed.  ;-)
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LVL 16

Expert Comment

by:choward16980
ID: 38829017
It's safe.  You will not be deleting active hosts.  Just orphaned hardware...
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LVL 3

Expert Comment

by:arifkayaca
ID: 38831545
Aging - scavenging mechanism only works dynamic dns restrictions, if you add your hosts manually, dns records don't be deleted automatically; According to me, delete old,unused records from dns, enter new records to dns (right click zone > add host(A) ), on all clients computer open command prompt and write  ipconfig /flushdns

And clients will resolve new dns records.


Good Luck...
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Accepted Solution

by:
bs_ssg earned 0 total points
ID: 38897203
Hey, I got laid off.  They are outsourcing IT.

Thanks for the help along the way.
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Author Closing Comment

by:bs_ssg
ID: 38968882
The issue became a moot point.
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