DNS Session Signaling
draft-ietf-dnsop-session-signal-03

Document Type Active Internet-Draft (dnsop WG)
Last updated 2017-07-03
Replaces draft-bellis-dnsop-session-signal
Stream IETF
Intended RFC status Proposed Standard
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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: January 4, 2018                                    J. Dickinson
                                                            S. Dickinson
                                                                 Sinodun
                                                               A. Mankin
                                                              Salesforce
                                                             T. Pusateri
                                                            Unaffiliated
                                                           July 03, 2017

                         DNS Session Signaling
                   draft-ietf-dnsop-session-signal-03

Abstract

   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.  This mechanism is
   intended to reduce the overhead of existing "per-packet" signaling
   mechanisms with "per-message" semantics as well as defining new
   signaling operations not defined in EDNS(0).

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 4, 2018.

Bellis, et al.           Expires January 4, 2018                [Page 1]
Internet-Draft            DNS Session Signaling                July 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Message Format  . . . . . . . . . . . . . . . . . . . . .   6
       4.1.1.  Header  . . . . . . . . . . . . . . . . . . . . . . .   7
       4.1.2.  Session Signaling Data  . . . . . . . . . . . . . . .   8
       4.1.3.  EDNS(0) and TSIG  . . . . . . . . . . . . . . . . . .  10
     4.2.  TLV Format  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Message Handling  . . . . . . . . . . . . . . . . . . . .  11
   5.  Keepalive Operation TLV . . . . . . . . . . . . . . . . . . .  12
     5.1.  Relation to EDNS(0) TCP Keepalive Option  . . . . . . . .  14
   6.  Retry Delay TLV . . . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  Use as an Operational TLV . . . . . . . . . . . . . . . .  14
     6.2.  Use as a Modifier TLV . . . . . . . . . . . . . . . . . .  15
   7.  Session Lifecycle and Timers  . . . . . . . . . . . . . . . .  15
     7.1.  Session Initiation  . . . . . . . . . . . . . . . . . . .  15
     7.2.  Timers  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.3.  Inactive Sessions . . . . . . . . . . . . . . . . . . . .  16
     7.4.  The Inactive Timeout  . . . . . . . . . . . . . . . . . .  17
       7.4.1.  Closing Inactive Sessions . . . . . . . . . . . . . .  17
       7.4.2.  Values for the Inactive Timeout . . . . . . . . . . .  18
     7.5.  The Keepalive Interval  . . . . . . . . . . . . . . . . .  18
       7.5.1.  Keepalive Interval Expiry . . . . . . . . . . . . . .  19
       7.5.2.  Values for the Keepalive Interval . . . . . . . . . .  19
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