A DNS Query including A Main Question with Accompanying Questions
draft-yao-dnsop-accompanying-questions-03

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Last updated 2017-06-23
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dnsop                                                             J. Yao
Internet-Draft                                                  P. Vixie
Intended status: Standards Track         CNNIC-Farsight Joint Laboratory
Expires: December 25, 2017                                       N. Kong
                                                                   X. Li
                                                                   CNNIC
                                                           June 23, 2017

   A DNS Query including A Main Question with Accompanying Questions
               draft-yao-dnsop-accompanying-questions-03

Abstract

   This document enables DNS initiators to send a main question
   accompanying with several related questions in a single DNS query,
   and enables DNS responders to put the answers into a single DNS
   response.  This extension enables a range of initiators to look up
   "X, or failing that, Y" in a better way than both current
   alternatives.  This mechanism can reduce the number of DNS round-
   trips per application work-unit.

Status of This Memo

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Yao, et al.             Expires December 25, 2017               [Page 1]
Internet-Draft            accompanying-queries                 June 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Mechanism for a main question with accompanying questions . .   3
   4.  Responder Processing  . . . . . . . . . . . . . . . . . . . .   6
   5.  Initiator Processing  . . . . . . . . . . . . . . . . . . . .   7
   6.  Query and Response Example  . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   10. Change History  . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  draft-yao-dnsop-accompanying-questions: Version 00 . . .   9
     10.2.  draft-yao-dnsop-accompanying-questions: Version 01 . . .   9
     10.3.  draft-yao-dnsop-accompanying-questions: Version 02 . . .   9
     10.4.  draft-yao-dnsop-accompanying-questions: Version 03 . . .   9
   11. Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Sometimes, when DNS lookup of X, an application will lookup Y if X
   fails.  For examples, the initiator may fall back to A record if the
   lookup of MX record fails.

   Some initiators do it in sequence, X and after a few seconds, then Y.
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