Problem Statement Regarding IPv6 Address Usage
draft-gont-6man-address-usage-recommendations-04

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IPv6 maintenance Working Group (6man)                            F. Gont
Internet-Draft                                    SI6 Networks / UTN-FRH
Intended status: Informational                                   G. Gont
Expires: May 3, 2018                                        SI6 Networks
                                                         M. Garcia Corbo
                                                                 SITRANS
                                                              C. Huitema
                                                    Private Octopus Inc.
                                                        October 30, 2017

             Problem Statement Regarding IPv6 Address Usage
            draft-gont-6man-address-usage-recommendations-04

Abstract

   This document analyzes the security and privacy implications of IPv6
   addresses based on a number of properties (such as address scope,
   stability, and usage type), and identifies gaps that currently
   prevent systems and applications from leveraging the increased
   flexibility and availability of IPv6 addresses.

Status of This Memo

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   This Internet-Draft will expire on May 3, 2018.

Copyright Notice

   Copyright (c) 2017 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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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Gont, et al.               Expires May 3, 2018                  [Page 1]
Internet-Draft             IPv6 Address Usage               October 2017

   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  IPv6 Address Properties . . . . . . . . . . . . . . . . . . .   4
     4.1.  Address Scope Considerations  . . . . . . . . . . . . . .   4
     4.2.  Address Stability Considerations  . . . . . . . . . . . .   5
     4.3.  Usage Type Considerations . . . . . . . . . . . . . . . .   6
   5.  Default Address Selection in IPv6 . . . . . . . . . . . . . .   7
   6.  Current Possible Approaches for IPv6 Address Usage  . . . . .   8
     6.1.  Incoming communications . . . . . . . . . . . . . . . . .   9
     6.2.  Outgoing communications . . . . . . . . . . . . . . . . .   9
   7.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Issues Associated with Sub-optimal IPv6 Address Usage . .  10
       7.1.1.  Correlation of Network Activity . . . . . . . . . . .  10
       7.1.2.  Testing for the Presence of Node in the Network . . .  10
       7.1.3.  Unexpected Address Discovery  . . . . . . . . . . . .  11
       7.1.4.  Availability Outside the Expected Scope . . . . . . .  11
     7.2.  Current Limitations in the Address Selection APIs . . . .  12
     7.3.  Sub-optimal IPv6 Address Configuration  . . . . . . . . .  12
     7.4.  Sub-optimal IPv6 Address Usage  . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     11.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   IPv6 addresses may differ in a number of properties, such as address
   scope (e.g. link-local vs. global), stability (e.g. stable addresses
   vs. temporary addresses), and intended usage type (outgoing
   communications vs. incomming communications).  While often
   overlooked, these properties have impact on areas such as security,
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