Problem Statement Regarding IP Address Usage
draft-gont-6man-address-usage-recommendations-05

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IPv6 maintenance Working Group (6man)                            F. Gont
Internet-Draft                                    SI6 Networks / UTN-FRH
Intended status: Informational                                   G. Gont
Expires: September 10, 2020                                 SI6 Networks
                                                              C. Huitema
                                                    Private Octopus Inc.
                                                           March 9, 2020

              Problem Statement Regarding IP Address Usage
            draft-gont-6man-address-usage-recommendations-05

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

   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 10, 2020.

Copyright Notice

   Copyright (c) 2020 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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Gont, et al.           Expires September 10, 2020               [Page 1]
Internet-Draft             IPv6 Address Usage                 March 2020

   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.  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 . . . . . . . . . . . . . .   8
   6.  Current Possible Approaches for IPv6 Address Usage  . . . . .   9
     6.1.  Incoming communications . . . . . . . . . . . . . . . . .   9
     6.2.  Outgoing communications . . . . . . . . . . . . . . . . .  10
   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 . . .  11
       7.1.3.  Unexpected Address Discovery  . . . . . . . . . . . .  11
       7.1.4.  Availability Outside the Expected Scope . . . . . . .  12
     7.2.  Current Limitations in the Address Selection APIs . . . .  12
     7.3.  Sub-optimal IPv6 Address Configuration  . . . . . . . . .  13
     7.4.  Sub-optimal IPv6 Address Usage  . . . . . . . . . . . . .  13
     7.5.  Operational Considerations  . . . . . . . . . . . . . . .  14
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     11.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

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,
   privacy, and performance.

   IPv6 hosts typically configure a number of IPv6 addresses of