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Nov
8

When DNS scavenging isn’t turned on old DNS records will stay populated in DNS, cluttering up your network routing. You’ll end up with PC’s listed multiple times at different IP addresses. Depending on your network setup the same thing could happen to servers. This means that traffic will be taking all sorts of paths to get to it’s destination – some of the correct and some of them incorrect.

We have a motto: It’s always DNS. So check your DNS scavenging settings. Because one of the often missed sets is to enable it.

Here’s how you do it:

Open DNS Manager. Right click on the DNS server and select properties. Move to the Advanced tab. At the bottom of the page check the box to enable scavenging. I usually leave the other settings at default but you can modify as needed. This is only half of the setup you need to perform. Checking this box will actually not result in any scavenging taking place.

image

The next step is to enable scavenging on the forward lookup zones you want scavenged. To do this, expand Forward Lookup Zones and right click on the zone that you wish to have scavenged. Generally this will be the zone where your PC’s reside. Choose Properties from the menu. This time stay on the General tab and press the Aging button.

image

Now that you’ve enable scavenging AND selected the DNS zone to be scavenged, scavenging will begin to happen.

If you server has been around for a while without scavenging turned on, you might want to perform a manual clean up. To do this sort the records in the zone by Timestamp and delete any records that are more than a couple of weeks old. Then let your newly configured scavenging setting take it from there.

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Sep
11
When Computer Logins Fail Randomly, Look at DNS Delegation
Posted by amy on 11 September 2012 11:36 AM

This post was submitted by Brian Higgins. Learn more about Brian at https://www.thirdtier.net/who/brian-higgins/

I recently came across a network that was experiencing some odd DNS problems. Client machines just randomly would fail to contact the domain controller at boot up for no apparent reason.  I ran dcdiag /test:DNS /v on the server and it showed in the summary that everything passed except for Del (delegation)

clip_image002

After reviewing the details of the delegation tests it turns out that when the domain was migrated from 2003 to 2008 R2 DC’s, the glue records for the _msdcs delegation did not get automatically updated, and were still pointing to the old DC. For those unfamiliar with what the _msdcs delegation is, see the image below.

clip_image004

If you click on the delegation you will see one or more Name Servers listed (your domain controllers in almost every case), but that is a little deceiving since what is actually recorded and used for the delegation is an IP address, which is not shown.  If you right click and go to properties on the delegation you can see the IP address associated with the server name, but if it has a * at the end of the name then it means it is a resolved name, and not a recorded name, which for a Name Server delegation, is invalid.

Remove any invalid entries from the list, you will be prompted at the end to confirm you want to remove the glue record associated with whatever IP address was shown, and add the correct server names (be sure to resolve them to the correct IP first) and that should fix your delegation problems, and the otherwise unexplainable client problems should (hopefully) go away as well.

I took a look through all of the other clients that I manage to see how many of them had invalid glue records and found that all but one other system was correct, that one had a DC that was still valid, but had changed IPs at one point, and the glue record still pointed to the old IP. A simple remove and re-add of the record cleared that problem right away.


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