IPv6 Address Assignment to End-Sites
draft-palet-v6ops-rfc6177-bis-02

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IPv6 Operations (v6ops)                                J. Palet Martinez
Internet-Draft                                          The IPv6 Company
Obsoletes: 6177 (if approved)                                 L. Roberts
Intended status: Best Current Practice          Stanford University, UIT
Expires: April 12, 2019                                  October 9, 2018

                  IPv6 Address Assignment to End-Sites
                    draft-palet-v6ops-rfc6177-bis-02

Abstract

   The Regional Internet Registries (RIRs) policies have different views
   regarding the recommendation of the prefix to be assigned to end-
   sites.  However, all them allow up to a /48 without further
   justification and clearly state that the exact choice of how much
   address space should be assigned to end-sites is a decision of each
   operator.

   This document reviews the architectural and operational
   considerations of end-site assignments, and reiterates that
   assignment policy and guidelines belong to the RIR community.  This
   revision is being made to emphasize that IPv6 protocol evolution
   requires an ever-increasing availability of subnets at the end-site,
   so policy should reflect that assignment of a single subnet is never
   recommended.

   This document obsoletes RFC6177 (IPv6 Address Assignment to End
   Sites).

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 April 12, 2019.

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Copyright Notice

   Copyright (c) 2018 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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Considerations Regarding the Prefix Length  . . . . . . . . .   4
   3.  On /48 Assignments to End-Sites . . . . . . . . . . . . . . .   5
   4.  Summary . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   There are a number of considerations that factor into address and
   prefix assignment policies.  For example, to provide for the long-
   term health and scalability of the public routing infrastructure, it
   is important that prefixes aggregate well [Route-Scaling].  Likewise,
   giving out an excessive amount of address space could result in
   premature depletion of the address space.  This document focuses on
   the (narrower) question of what is an appropriate IPv6 address
   assignment size for end-sites.  That is, when end-sites request IPv6
   address space from ISPs, what is an appropriate assignment size.

   [RFC3177] called for a default end-site IPv6 assignment size of /48.
   Subsequently, the Regional Internet Registries (RIRs) developed and
   adopted IPv6 address assignment and allocation policies consistent
   with ISP practices, and it triggered the development of [RFC6177].
   Current RIR policies still allow using /48, but leave the decision in
   the hands of the ISP.  In some cases, encourage the assignment /48
   blocks for all, while other RIRs encourage the assignment of smaller
   (e.g., /56) blocks to residential end-sites, while keeping /48 for
   business.

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   More recently, a Global IPv6 Deployment Survey (for residential/