DNS Transport over TCP - Implementation Requirements
draft-ietf-dnsop-5966bis-03

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Document Type Active Internet-Draft (dnsop WG)
Authors John Dickinson  , Sara Dickinson  , Ray Bellis  , Allison Mankin  , Duane Wessels 
Last updated 2015-11-01 (latest revision 2015-09-20)
Replaces draft-dickinson-dnsop-5966-bis
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dnsop                                                       J. Dickinson
Internet-Draft                                              S. Dickinson
Obsoletes: 5966 (if approved)                                    Sinodun
Intended status: Standards Track                               R. Bellis
Expires: March 23, 2016                                              ISC
                                                               A. Mankin
                                                              D. Wessels
                                                           Verisign Labs
                                                      September 20, 2015

          DNS Transport over TCP - Implementation Requirements
                      draft-ietf-dnsop-5966bis-03

Abstract

   This document specifies the requirement for support of TCP as a
   transport protocol for DNS implementations and provides guidelines
   towards DNS-over-TCP performance on par with that of DNS-over-UDP.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on March 23, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Dickinson, et al.        Expires March 23, 2016                 [Page 1]
Internet-Draft                DNS over TCP                September 2015

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Terminology  . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Transport Protocol Selection  . . . . . . . . . . . . . . . .   5
   6.  Connection Handling . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Current practices . . . . . . . . . . . . . . . . . . . .   6
       6.1.1.  Clients . . . . . . . . . . . . . . . . . . . . . . .   7
       6.1.2.  Servers . . . . . . . . . . . . . . . . . . . . . . .   7
     6.2.  Recommendations . . . . . . . . . . . . . . . . . . . . .   7
       6.2.1.  Connection Re-use . . . . . . . . . . . . . . . . . .   7
         6.2.1.1.  Query Pipelining  . . . . . . . . . . . . . . . .   8
       6.2.2.  Concurrent connections  . . . . . . . . . . . . . . .   8
       6.2.3.  Idle Timeouts . . . . . . . . . . . . . . . . . . . .   9
       6.2.4.  Tear Down . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Response Reordering . . . . . . . . . . . . . . . . . . . . .   9
   8.  TCP Message Length Field  . . . . . . . . . . . . . . . . . .  10
   9.  TCP Fast Open . . . . . . . . . . . . . . . . . . . . . . . .  10
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     13.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Appendix A.  Summary of Advantages and Disadvantages to using TCP
                for DNS  . . . . . . . . . . . . . . . . . . . . . .  14
   Appendix B.  Changes between revisions  . . . . . . . . . . . . .  15
     B.1.  Changes -02 to -03  . . . . . . . . . . . . . . . . . . .  15
     B.2.  Changes -01 to -02  . . . . . . . . . . . . . . . . . . .  15
     B.3.  Changes -00 to -01  . . . . . . . . . . . . . . . . . . .  16
     B.4.  Changes to RFC 5966 . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Most DNS [RFC1034] transactions take place over UDP [RFC0768].  TCP
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