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RFC 7871 - Client Subnet in DNS Queries

Carlo Contavalli
Wilmer van der Gaast
David C Lawrence
Warren Kumari
IETF, IETF (2016)

Abstract

This document describes an Extension Mechanisms for DNS (EDNS0) option that is in active use to carry information about the network that originated a DNS query and the network for which the subsequent response can be cached. Since it has some known operational and privacy shortcomings, a revision will be worked through the IETF for improvement.