Interactive Connectivity Establishment Patiently Awaiting Connectivity (ICE PAC)
draft-ietf-ice-pac-03

Document Type Active Internet-Draft (ice WG)
Last updated 2019-10-15 (latest revision 2019-10-13)
Replaces draft-holmberg-ice-pac
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ICE Working Group                                            C. Holmberg
Internet-Draft                                                  Ericsson
Updates: 8445 (if approved)                                    J. Uberti
Intended status: Standards Track                                  Google
Expires: April 15, 2020                                 October 13, 2019

 Interactive Connectivity Establishment Patiently Awaiting Connectivity
                               (ICE PAC)
                         draft-ietf-ice-pac-03

Abstract

   During the process of establishing peer-to-peer connectivity, ICE
   agents can encounter situations where they have no candidate pairs to
   check, and, as a result, conclude that ICE processing has failed.
   However, because additional candidate pairs can be discovered during
   ICE processing, declaring failure at this point may be premature.
   This document discusses when these situations can occur and proposes
   a way to avoid premature failure.  This document updates RFC 8445 and
   RFC XXXX.

   [RFC EDITOR NOTE: Please replace RFC XXXX with the RFC number of
   draft-ietf-ice-trickle once it has been published.  Please also
   indicate that this specification updates RFC XXXX.]

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
   Task Force (IETF).  Note that other groups may also distribute
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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 April 15, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft                   ICE PAC                    October 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Relevant Scenarios  . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  No Candidates From Peer . . . . . . . . . . . . . . . . .   3
     3.2.  All Candidates Discarded  . . . . . . . . . . . . . . . .   3
     3.3.  Immediate Candidate Pair Failure  . . . . . . . . . . . .   4
   4.  Update to RFC 8445  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Update to RFC XXXX  . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [RFC8445] describes a protocol, Interactive Connectivity
   Establishment (ICE), for Network Address Translator (NAT) traversal
   for UDP-based communication.

   When using ICE, endpoints will typically exchange ICE candidates,
   form a list of candidate pairs, and then test each candidate pair to
   see if connectivity can be established.  If the test for a given pair
   fails, it is marked accordingly, and if all pairs have failed, the
   overall ICE process typically is considered to have failed.

   During the process of connectivity checks, additional candidates may
   be created as a result of successful inbound checks from the remote
   peer.  Such candidates are referred to as peer-reflexive candidates,
   and once discovered, will be used to form new candidate pairs which
   will be tested like any other.  However, there is an inherent race
   condition here; if, before learning about any peer-reflexive
   candidates, an endpoint runs out of candidate pairs to check, either
   because it has none, or it considers them all to have failed, it will
   prematurely declare failure and terminate ICE processing.  This race
   condition can occur in many common situations.

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