RFC 8767 on Serving Stale Data to Improve DNS Resiliency
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Subject: RFC 8767 on Serving Stale Data to Improve DNS Resiliency
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A new Request for Comments is now available in online RFC libraries.
RFC 8767
Title: Serving Stale Data to Improve DNS Resiliency
Author: D. Lawrence,
W. Kumari,
P. Sood
Status: Standards Track
Stream: IETF
Date: March 2020
Mailbox: tale@dd.org,
warren@kumari.net,
puneets@google.com
Pages: 12
Updates: RFC 1034, RFC 1035, RFC 2181
I-D Tag: draft-ietf-dnsop-serve-stale-10.txt
URL: https://www.rfc-editor.org/info/rfc8767
DOI: 10.17487/RFC8767
This document defines a method (serve-stale) for recursive resolvers
to use stale DNS data to avoid outages when authoritative nameservers
cannot be reached to refresh expired data. One of the motivations for
serve-stale is to make the DNS more resilient to DoS attacks and
thereby make them less attractive as an attack vector. This document
updates the definitions of TTL from RFCs 1034 and 1035 so that data
can be kept in the cache beyond the TTL expiry; it also updates RFC
2181 by interpreting values with the high-order bit set as being
positive, rather than 0, and suggests a cap of 7 days.
This document is a product of the Domain Name System Operations Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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