Negative Caching of DNS Queries
RFC 2308, “Negative Caching of DNS Queries”, is a Proposed Standard document published in March 1998 by M. Andrews. It updates RFC 1034, RFC 1035. It has since been updated by RFC 4033, RFC 4034, RFC 4035, RFC 6604, RFC 8020, RFC 8499, RFC 9499, RFC 9520. The canonical text is published by the RFC Editor.
Abstract
RFC1034 provided a description of how to cache negative responses. It however had a fundamental flaw in that it did not allow a name server to hand out those cached responses to other resolvers, thereby greatly reducing the effect of the caching. This document addresses issues raise in the light of experience and replaces RFC1034 Section 4.3.4. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 2308 is hosted at rfc-editor.org. Available in TXT,HTML.
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