A New Internet-Draft is available from the on-line Internet-Drafts
directories. This Internet-Draft is a work item of the Domain Name System
Operations (DNSOP) WG of the IETF.
Title : Negative Caching of DNS Resolution Failures
Authors : Duane Wessels
William Carroll
Matthew Thomas
Filename : draft-ietf-dnsop-caching-resolution-failures-05.txt
Pages : 17
Date : 2023-07-10
Abstract:
In the DNS, resolvers employ caching to reduce both latency for end
users and load on authoritative name servers. The process of
resolution may result in one of three types of responses: (1) a
response containing the requested data; (2) a response indicating the
requested data does not exist; or (3) a non-response due to a
resolution failure in which the resolver does not receive any useful
information regarding the data's existence. This document concerns
itself only with the third type.
RFC 2308 specifies requirements for DNS negative caching. There,
caching of type (1) and (2) responses is mandatory and caching of
type (3) responses is optional. This document updates RFC 2308 to
require negative caching for DNS resolution failures.
RFC 4035 allows DNSSEC validation failure caching. This document
updates RFC 4035 to require caching for DNSSEC validation failures.
RFC 4697 prohibits aggressive requerying for NS records at a failed
zone's parent zone. This document updates RFC 4697 to expand this
requirement to all query types and to all ancestor zones.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-dnsop-caching-resolution-failures/
There is also an htmlized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-caching-resolution-failures-05
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-dnsop-caching-resolution-failures-05
Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts
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