Q:

What is DNS scavenging?

A:

Quick Answer

DNS scavenging refers to a technique used in DNS servers that allows the cleaning of outdated information used by the DNS server to find resources. This functionality is available in Windows DNS servers and helps automate the removal of obsolete records.

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What is DNS scavenging?
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Full Answer

The feature is integrated in DNS servers to facilitate the removal of old records that are no longer needed by the server. Failure to effectively delete the records leads to their accumulation, affecting the performance of the server. Apart from occupying disk space on the server, the outdated records may also be used to service user queries. It is therefore imperative that the records are updated dynamically.

When a computer previously connected to a network losses the connection, its record needs to be removed from the server. The server administrator therefore needs to understand how to configure DNS scavenging correctly. He should always ensure that the feature is active for all zones.

After enabling the feature, the refresh and no-refresh intervals should be set. These two values determine whether resource records are outdated or are still valid. If outdated, they need to be eliminated so that they are not retained in the server. The event log in the DNS server should be used to troubleshoot problems with DNS scavenging.

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