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Status:

BEST CURRENT PRACTICE

Updated by:

RFC 9520

Authors:

M. Larson
P. Barber

Stream:

IETF

Source:

dnsop (ops)

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Abstract

This memo describes DNS iterative resolver behavior that results in asignificant query volume sent to the root and top-level domain (TLD)name servers. We offer implementation advice to iterative resolverdevelopers to alleviate these unnecessary queries. Therecommendations made in this document are a direct byproduct ofobservation and analysis of abnormal query traffic patterns seen attwo of the thirteen root name servers and all thirteen com/net TLDname servers. This document specifies an Internet Best Current Practices for theInternet Community, and requests discussion and suggestions forimprovements.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.