Information Technology Reference
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not been updated in a certain amount of time (determined by the scavenging interval).
These stale records will be scavenged at the next cleanup interval. DNS uses time stamps on
the resource records to determine how long they have been listed in the DNS database.
DNS allows an administrator to set up and configure aging and scavenging through the
use of the DNS snap-in. DNS aging and scavenging allows an administrator to perform
some of the following related tasks for your DNS servers and any of the Active Directory-
Integrated zones that they load:
■
Administrators can enable or disable the use of scavenging at a DNS server and/or for
selected zones at the DNS server.
■
You can modify the no-refresh/refresh interval, either as a server default or by specify-
ing an overriding value at selected zones.
■
Administrators can specify when periodic scavenging occurs automatically at the DNS
server for any of its eligible zones and how often these operations are repeated.
■
Manually initiate a single scavenging operation for all eligible zones at the DNS server.
Enabling Scavenging of Stale Records
When you install Windows Server 2012 R2 DNS aging and scavenging features on all DNS
servers and any of their zones, administrators should consider the following settings before
using these features:
Determine whether you should use aging and scavenging for server-wide settings.
When
using these settings, you are choosing to affect every one of the zone-level properties for all
Active Directory-Integrated zones that are loaded at the server.
Determine whether you should use aging and scavenging for zone settings.
When using
these settings, you are choosing to use them for zone-specific properties for just the selected
zones and not the entire server. These settings apply only to the applicable zone and its
resource records, and they do not apply to any other zone on the DNS server. Unless these
zone-level properties are otherwise configured, they inherit their defaults from comparable
settings that are maintained in server aging and scavenging properties.
Enabling aging and scavenging for use with standard primary zones modi-
fies the format of zone files. This change does not affect zone replication to
secondary servers, but the modified zone files cannot be loaded by other
versions of DNS servers.
Monitoring and Troubleshooting DNS
Now that you have set up and configured your DNS name server and created some resource
records, you will want to confirm that it is resolving and replying to client DNS requests. A
couple of tools allow you to do some basic monitoring and managing. Once you are able to
monitor DNS, you'll want to start troubleshooting.
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