ICE Renomination: Dynamically selecting ICE candidate pairs
draft-thatcher-ice-renomination-01

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Network Working Group                                        P. Thatcher
Internet-Draft                                                  H. Zhang
Intended status: Standards Track                         T. Brandstetter
Expires: March 23, 2017                                           Google
                                                      September 19, 2016

      ICE Renomination: Dynamically selecting ICE candidate pairs
                   draft-thatcher-ice-renomination-01

Abstract

   This document describes an extension to the Interactive Connectivity
   Establishment (ICE) that enables ICE agents to dynamically change the
   selected candidate pair of the controlled side by allowing the
   controlling side to nominate different candidate pairs over time as
   network conditions change.

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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Thatcher, et al.         Expires March 23, 2017                 [Page 1]
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Renomination  . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  "Nomination" attribute  . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   ICE agents are either controlling or controlled.  The controlling ICE
   agent can unilaterally select a given candidate pair at any time.
   But it cannot control what candidate pair the controlled ICE agent
   selects once the controlling ICE agent has nominated a candidate pair
   (with passive nomination) or nominated many candidate pairs (with
   aggressive nomination), with the exception that it may nominate a
   higher priority candidate pair with aggressive nomination.  This
   greatly limits the controlling side's options.

   For example, if an ICE agent selects and nominates a candidate pair
   over a cellular network, and then later connects to a Wi-Fi network
   and trickles ICE candidates for the Wi-Fi network, it may wish to
   select and nominate a candidate pair using Wi-Fi.  If soon thereafter
   the Wi-Fi network disconnects and the ICE agent wishes to select and
   nominate the cellular candidate pair again, it would be unable to do
   with either passive or aggressive nomination.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Renomination

   We define a new ICE option called "renomination".  When renomination
   is signaled, aggressive nomination is disabled, and the controlled
   side follows a rule of "last nomination wins".  This allows the
   controlling side to send nominations for new candidate pairs at any
   time.  The controlling side SHOULD send the new nomination until the
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