IPv6 Addressing Considerations
draft-gont-v6ops-ipv6-addressing-considerations-00

Document Type Active Internet-Draft (individual)
Authors Fernando Gont  , Guillermo Gont 
Last updated 2020-12-11
Stream (None)
Intended RFC status (None)
Formats plain text pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
IPv6 Operations Working Group (v6ops)                            F. Gont
Internet-Draft                                                   G. Gont
Intended status: Informational                              SI6 Networks
Expires: June 14, 2021                                 December 11, 2020

                     IPv6 Addressing Considerations
           draft-gont-v6ops-ipv6-addressing-considerations-00

Abstract

   IPv6 addresses can differ in a number of properties, such as scope,
   stability, and intended usage type.  This document analyzes the
   impact of these properties on aspects such as security, privacy,
   interoperability, and network operations.  Additionally, it
   identifies challenges and 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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 14, 2021.

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
   Provisions Relating to IETF Documents
   (https://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

Gont & Gont               Expires June 14, 2021                 [Page 1]
Internet-Draft       IPv6 Addressing Considerations        December 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may not be modified, and derivative works of it may not
   be created, and it may not be published except as an Internet-Draft.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Legacy Specifications and Schemes . . . . . . . . . . . .   4
     3.2.  Unique Local IPv6 Unicast Addresses (ULAs)  . . . . . . .   5
   4.  IPv6 Address Properties . . . . . . . . . . . . . . . . . . .   5
     4.1.  Address Scope Considerations  . . . . . . . . . . . . . .   6
     4.2.  Provider Dependency . . . . . . . . . . . . . . . . . . .   7
     4.3.  Address Reachability  . . . . . . . . . . . . . . . . . .   8
     4.4.  Address Stability Considerations  . . . . . . . . . . . .   9
   5.  IPv6 Address Usage  . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Default Address Selection . . . . . . . . . . . . . . . .  11
     5.2.  Usage Type Considerations . . . . . . . . . . . . . . . .  12
     5.3.  Current Alternatives for IPv6 Address Usage . . . . . . .  12
       5.3.1.  Incoming communications . . . . . . . . . . . . . . .  12
       5.3.2.  Outgoing communications . . . . . . . . . . . . . . .  14
   6.  Current Issues  . . . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  Sub-optimal IPv6 Address Usage  . . . . . . . . . . . . .  14
       6.1.1.  Correlation of Network Activity . . . . . . . . . . .  14
       6.1.2.  Passive Host Tracking . . . . . . . . . . . . . . . .  15
       6.1.3.  Unintended Service Disclosure . . . . . . . . . . . .  15
       6.1.4.  Availability Outside the Expected Scope . . . . . . .  16
     6.2.  Sub-optimal Address Configuration . . . . . . . . . . . .  16
       6.2.1.  Number of Addresses . . . . . . . . . . . . . . . . .  16
       6.2.2.  SLAAC/DHCPv6 Interaction  . . . . . . . . . . . . . .  17
     6.3.  Operation of Multi-Prefix/Multi-Address/Multi-Router
           Networks  . . . . . . . . . . . . . . . . . . . . . . . .  17
       6.3.1.  Implications of Addresses . . . . . . . . . . . . . .  17
       6.3.2.  Legitimate Network Activity Correlation . . . . . . .  17
       6.3.3.  Routing in Multi-Prefix/Multi-Router Networks . . . .  18
       6.3.4.  Renumbering . . . . . . . . . . . . . . . . . . . . .  18
   7.  Current Gaps that Prevent Leveraging IPv6 Addressing  . . . .  19
     7.1.  Better Address Selection APIs . . . . . . . . . . . . . .  19
     7.2.  Universal Support of Multi-prefix/Multi-router Networks .  20
Show full document text