Dear DNSOP, In light of some recent events and research, we feel that it could be beneficial to strengthen the requirements around negative caching of DNS resolution failures. Please see the recently submitted Internet Draft referenced below and let us know if you have any feedback.
DW Begin forwarded message: From: <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] New Version Notification for draft-dwmtwc-dnsop-caching-resolution-failures-00.txt Date: January 13, 2022 at 1:28:00 PM PST To: Duane Wessels <[email protected]<mailto:[email protected]>>, Matthew Thomas <[email protected]<mailto:[email protected]>>, William Carroll <[email protected]<mailto:[email protected]>> A new version of I-D, draft-dwmtwc-dnsop-caching-resolution-failures-00.txt has been successfully submitted by William Carroll and posted to the IETF repository. Name: draft-dwmtwc-dnsop-caching-resolution-failures Revision: 00 Title: Negative Caching of DNS Resolution Failures Document date: 2022-01-13 Group: Individual Submission Pages: 13 URL: https://www.ietf.org/archive/id/draft-dwmtwc-dnsop-caching-resolution-failures-00.txt Status: https://datatracker.ietf.org/doc/draft-dwmtwc-dnsop-caching-resolution-failures/ Htmlized: https://datatracker.ietf.org/doc/html/draft-dwmtwc-dnsop-caching-resolution-failures 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. The IETF Secretariat
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