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RFC 9715
Title: IP Fragmentation Avoidance in DNS over UDP
Author: K. Fujiwara,
P. Vixie
Status: Informational
Stream: IETF
Date: January 2025
Mailbox: fujiw...@jprs.co.jp,
p...@redbarn.org
Pages: 13
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-dnsop-avoid-fragmentation-20.txt
URL: https://www.rfc-editor.org/info/rfc9715
DOI: 10.17487/RFC9715
The widely deployed Extension Mechanisms for DNS (EDNS(0)) feature in
the DNS enables a DNS receiver to indicate its received UDP message
size capacity, which supports the sending of large UDP responses by a
DNS server. Large DNS/UDP messages are more likely to be fragmented,
and IP fragmentation has exposed weaknesses in application protocols.
It is possible to avoid IP fragmentation in DNS by limiting the
response size where possible and signaling the need to upgrade from
UDP to TCP transport where necessary. This document describes
techniques to avoid IP fragmentation in DNS.
This document is a product of the Domain Name System Operations Working Group
of the IETF.
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It does not specify an Internet standard of any kind. Distribution of
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