DNS Session Signaling
draft-ietf-dnsop-session-signal-02

Document Type Active Internet-Draft (dnsop WG)
Last updated 2017-03-13
Replaces draft-bellis-dnsop-session-signal
Stream IETF
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DNSOP Working Group                                            R. Bellis
Internet-Draft                                                       ISC
Updates: RFC 7766 (if approved)                              S. Cheshire
Intended status: Standards Track                              Apple Inc.
Expires: September 14, 2017                                 J. Dickinson
                                                            S. Dickinson
                                                                 Sinodun
                                                               A. Mankin
                                                              Salesforce
                                                             T. Pusateri
                                                            Unaffiliated
                                                          March 13, 2017

                         DNS Session Signaling
                   draft-ietf-dnsop-session-signal-02

Abstract

   The EDNS(0) Extension Mechanism for DNS is explicitly defined to only
   have "per-message" semantics.  This document defines a new Session
   Signaling Opcode used to communicate persistent "per-session"
   operations, expressed using type-length-value (TLV) syntax, and
   defines an initial set of TLVs used to manage session timeouts and
   termination.

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 September 14, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Bellis, et al.         Expires September 14, 2017               [Page 1]
Internet-Draft            DNS Session Signaling               March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Session Lifecycle and Timers  . . . . . . . . . . . . . .   6
       3.1.1.  Client-Initiated Termination  . . . . . . . . . . . .   9
       3.1.2.  Server-Initiated Termination  . . . . . . . . . . . .   9
     3.2.  Connection Sharing  . . . . . . . . . . . . . . . . . . .  11
     3.3.  Message Format  . . . . . . . . . . . . . . . . . . . . .  13
     3.4.  Message Handling  . . . . . . . . . . . . . . . . . . . .  15
     3.5.  TLV Format  . . . . . . . . . . . . . . . . . . . . . . .  17
   4.  Keepalive TLV . . . . . . . . . . . . . . . . . . . . . . . .  18
   5.  Retry Delay TLV . . . . . . . . . . . . . . . . . . . . . . .  21
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
     6.1.  DNS Session Signaling Opcode Registration . . . . . . . .  22
     6.2.  DNS Session Signaling RCODE Registration  . . . . . . . .  22
     6.3.  DNS Session Signaling Type Codes Registry . . . . . . . .  22
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  23
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  23
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   The use of transports for DNS other than UDP is being increasingly
   specified, for example, DNS over TCP [RFC1035][RFC7766] and DNS over
   TLS [RFC7858].  Such transports can offer persistent, long-lived
   sessions and therefore when using them for transporting DNS messages
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