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Status:

INFORMATIONAL

Authors:

K. Fujiwara
P. Vixie

Stream:

IETF

Source:

dnsop (ops)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC9715

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Abstract

The widely deployed Extension Mechanisms for DNS (EDNS(0)) feature inthe DNS enables a DNS receiver to indicate its received UDP messagesize capacity, which supports the sending of large UDP responses by aDNS 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 theresponse size where possible and signaling the need to upgrade fromUDP to TCP transport where necessary. This document describestechniques to avoid IP fragmentation in DNS.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.