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Scavenging DNS records

he_who_dares
he_who_dares asked
on
Medium Priority
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Last Modified: 2012-06-21
Hi,

We have a lot of old duplicated records and i was going to enable scavenging.

However, having a look at some of the timestamps of the records such as the ones for the Exchange 2003 Cluster, i see that their timestamp is from 2005 (i assume when setup).

If i enabled scavenging would it also wipe out these records?

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CERTIFIED EXPERT

Commented:
Only if they are dynamic records.
DNS records that you create manually as static records will not be scavenged.

Here's some good reading:
http://blogs.technet.com/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx

Author

Commented:
How do you know if they are static or not?

We use dynamic dns and i would imagine those records for the Exchange were dynamically created when it was built..
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Commented:
Well, if the record is there because the machine joined the domain and registered it's own DNS, then it's dynamic. If you manually went into DNS and created the record, then most likely it's static, especially if you turn off the check box that says to delete the record when it expires.

Author

Commented:
Well i imagine the server records were created when joined to the domain yes.

The image below shows the record for one of the exchange cluster nodes.

Does this mean it will get deleted if i run scavenging?
dns.JPG
CERTIFIED EXPERT

Commented:
Yes. If you turn off that checkbox, then it becomes a static record that will never become stale and will never have to be refreshed by the client.

Author

Commented:
so really then its very dangerous to use scanvenging as it could wipe out all your server records?!
CERTIFIED EXPERT
Commented:
No. Not necessarily. Since the server updates it's record every day anyhow, then the records should always be fresh. Scavenging will only delete records that are old and outdated. The graphic below shows the settings that can be used for scavenging. The default setting of 7 days shows to only delete records that have not been updated within 7 days.

Here is an article from Microsoft that further details the workings behind Dynamic DNS updates from servers. In particular, "By default, Windows XP and Windows Server 2003 reregister their A and PTR resource records every 24 hours regardless of the computer's role."
From: http://support.microsoft.com/kb/816592



Scavenging.jpg

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