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03.28.2008 at 01:03PM PDT, ID: 23278364
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Need to clean up DNS duplicate resource records

Tags: Microsoft, Windows, 2000/2003, DNS Duplicate Resource records
Hi I have 2 servers, running Windows 2000 and Windows 2003, replicating eachother.  I have DNS turned on both machines. DHCP is running on the 2000 machine.  I have recently noticed that scavenging has never been turned on on either machine, and the forward and reverse lookup zones are full of stale and duplicate IP records.  I have read many, many articles about turning scavenging on, and (I think) I have turned it on using basic default settings (ie: Server level 7 days all settings, Zone level 7 days all settings and scavenge period 7 day).  My DHCP leases expire every 8 days.

Is this how I should begin with getting things cleaned up?  Should I go through the zones and manually delete stale records before scavenging happens?  (I would like to get this cleaned up ASAP as we are experiencing problems.. can I set the refresh/no refresh periods to shorter to cause the scavenge to happen quicker?)  Do I need to do anything else?  

In looking at the A and PTR records for some special machines, I turned OFF the "Delete when record becomes stale" just in case because I do not want those to delete (they are "application server" machines or machines that stay on all the time).  I also ran the manual command to age the records immediately.

I noticed that when I ran the manual scavenge to delete records now, nothing got deleted, and I'm assuming that's because no records are eligible yet because of the refresh/no refresh periods?

Sorry, I'm not the best at DNS.  
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Question Stats
Zone: Networking
Question Asked By: deik313
Solution Provided By: techno-wiz
Participating Experts: 1
Solution Grade: A
Views: 117
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03.28.2008 at 01:16PM PDT, ID: 21233826

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03.28.2008 at 01:19PM PDT, ID: 21233847

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03.28.2008 at 02:53PM PDT, ID: 21234392

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03.28.2008 at 03:37PM PDT, ID: 21234588

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03.28.2008 at 01:16PM PDT, ID: 21233826
Lots of questions about this today.

You can have a good quick read here:
http://www.experts-exchange.com/Networking/Protocols/DNS/Q_23019450.html

You don't need to manually delete stale records before scavenging.

You don't want to set the refresh/no refresh periods too short because you will end up scavenging DNS records that are still good and will cause people to lose access to network resources because the DNS records are missing. Voice of experience there! Not fun.
 
03.28.2008 at 01:19PM PDT, ID: 21233847
Also make sure you have set your scavenging properties at both the server and zone level.
 
03.28.2008 at 02:53PM PDT, ID: 21234392
Thank you for your answers, and for the article.  That helped a lot.  So, I've done the following:
1. At the Server level, I've set both scavaging intervals to 4 days.
2. At the Server level, I've enabled scavaging and made the scavaging period 1 day.
3. On the Forward lookup zone, I've set the scavaging intervals both to 4 days and made sure Dynamic updates was enabled.
4. In DHCP, the lease duration is 8 days, and the DNS settings are:
     * Automatically update DHCP client info in DNS (Always)
     * Discard forward lookups when lease expires
     (I'm running DHCP on the Windows 2000 server)

A few more questions:
Is this all correct?
Do I need to UNcheck the individual DNS options in DHCP for fixed IP machines (ie: for firewalls, servers, machines that stay on all the time?)?
Do I need to check the "Update associated PTR record" on any of the A records in the forward lookup zone (don't really know why that is there)?
Do I need to set scavenging intervals on the reverse lookup zone?
Will these changes automatically propogate to my 2003 server DNS?

Thank You!!!
 
03.28.2008 at 03:37PM PDT, ID: 21234588
Is this all correct?

Looks good to me.


Do I need to UNcheck the individual DNS options in DHCP for fixed IP machines (ie: for firewalls, servers, machines that stay on all the time?)?

Don't follow you here.


Do I need to check the "Update associated PTR record" on any of the A records in the forward lookup zone (don't really know why that is there)?

I wouldn't alter any individual DNS records unless they are records you are manually entering in which case they won't be scavenged anyway.


Do I need to set scavenging intervals on the reverse lookup zone?

No


Will these changes automatically propogate to my 2003 server DNS?

The scavenge settings won't. But of course the records that get deleted on one server will get deleted on the other through replication.
Accepted Solution
 
 
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