Network Working Group                                          E. Horley
Internet-Draft                                                T. Coffeen
Intended status: Informational                                   S. Hogg
Expires: 30 July 2022                                          HexaBuild
                                                             N. Buraglio
                                                             C. Cummings
                                                 Energy Sciences Network
                                                                K. Myers
                                                           IP ArchiTechs
                                                                R. White
                                                        Juniper Networks
                                                         26 January 2022

                    Expanding the IPv6 Lab Use Space


   To reduce the likelihood of addressing conflicts and confusion
   between lab deployments and non-lab (i.e., production) deployments,
   an IPv6 unicast address prefix is reserved for use in lab, proof-of-
   concept, and validation networks as well as for any similar use case.
   This document describes the use of the IPv6 address prefix 0200::/7
   as a prefix reserved for this purpose (repurposing the deprecated OSI
   NSAP-mapped prefix).

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

   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 30 July 2022.

Copyright Notice

   Copyright (c) 2022 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (
   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 Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  New Lab IPv6 Address Prefix . . . . . . . . . . . . . . . . .   3
   3.  Operational Implications  . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The address architecture for IPv6 ([RFC4291]) does not explicitly
   define any prefixes allocated exclusively for lab use, nor is such
   address space allocated in [RFC6890] or in [RFC8200].  While lab
   deployments could potentially use IPv6 address prefixes typically
   assigned and configured in non-lab network, the use of such
   addressing in lab environments may create addressing conflicts and
   operational confusion.  For instance, designing labs utilizing ULA
   fc00::/7 [RFC4193] is problematic due to the random global ID
   requirement preventing hierarchical network prefix design
   possibilities.  Further, default address selection behavior [RFC6724]
   by end nodes may result in a depreferencing of such addresses and
   prevent lab deployments from accurately modeling their desired non-
   lab equivalents.

   To resolve these problems involved in building large-scale lab
   networks, and pre-staging, or automating large-scale networks for
   deployment, this document allocates the IPv6 address prefix 0200::/7
   for these purposes.

   The goal is to allow organization to share working lab configuration
   files (with little or no need of modification) to be deployed in a
   third party lab environment like,

   public and private clouds,

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   virtualization or hosting environments,

   and in other networks like Service Providers, Enterprise, Government,
   IoT, and Energy,

   all with the knowledge that the lab GUA address space will perform
   the same as any GUA but with the added knowledge that filtering will
   be used to protect accidental leaks to the Internet.

   The following criteria is for selecting the lab prefix:

   The precedence for the lab prefix should no be lower than the GUA
   prefix as defined in [RFC6724] (unlike ULA).  Reduce the operational
   impacts to IANA and the RIR's in selecting lab prefix space.

2.  New Lab IPv6 Address Prefix

   The prefix reserved for lab and testing purposes is 0200::/7.

3.  Operational Implications

   This space SHOULD NOT be employed for addressing use cases which are
   already defined in other RFCs, such as addresses set apart for
   documentation, testing, etc.

   Enterprise and large-scale networks have some specific criteria
   around building and validating prior to deployment.  The issues with
   ULA for infrastructure modeling and labbing at the host level are
   more impactful in large enterprises.  This is due to the increased
   focus on large-scale hosts, servers, and apps testing.  Also, it is
   likely that both GUA and ULA may co-exist (or are planned) and
   reconfiguring lab hosts and networks isn't practical or desirable due
   to inconsistent results for host preference due to [RFC6724]

   Most large enterprises strive to build lab, dev, and QA environments
   that reflect production as accurately as possible.  This is a fairly
   straightforward way to avoid disparity between production and non-
   production.  Enterprise environments are an area that need increased
   IPv6 adoption.  In an effort to make it easier to model a global
   enterprise and to avoid the pitfalls of ULA de-preferenced host
   behavior or squatting on other IPv6 space, a specific IPv6 lab prefix
   is being assigned.

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   Because this address prefix has previously been used for the OSI
   NSAP-mapped prefix set in [RFC4048] and [RFC4548], and deprecated,
   this address prefix is already limited in its usability.  In
   addition, the address prefix was returned to IANA and is available to
   be marked for lab or other purposes.

   This assignment implies that IPv6 network operators SHOULD add this
   address prefix to the list of non-routable IPv6 address space, and if
   packet filters are deployed, then this address prefix SHOULD be added
   to packet filters.  This is not a local-use address prefix so these
   filters may be used in both local and public contexts.

4.  IANA Considerations

   IANA is to record the reservation of the IPv6 global unicast address
   prefix 0200::/7 as a lab-only prefix in the IPv6 address registry.
   No end party is to be assigned this address.

5.  Security Considerations

   The addresses assigned for lab and staging use SHOULD be filtered as
   noted above.

   Setting aside address space for lab and staging use, and adding this
   address space to common filters to prevent destinations in this space
   from being routed in production networks (including the global
   Internet) improves security by preventing the leakage of prefixes
   used for testing into production environments.  As such, setting
   aside this space improves the overall security posture of the

6.  Acknowledgements

   The authors acknowledge the work of Bob Hinden and Stephen Deering,
   in authoring the protocol standard and the addressing architecture
   for IPv6.

7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,

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Internet-Draft      Expanding the IPv6 Lab Use Space        January 2022

   [RFC8200]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", STD 86, RFC 8200,
              DOI 10.17487/RFC8200, July 2017,

7.2.  Informative References

   [RFC3515]  Sparks, R., "The Session Initiation Protocol (SIP) Refer
              Method", RFC 3515, DOI 10.17487/RFC3515, April 2003,

   [RFC4048]  Carpenter, B., "RFC 1888 Is Obsolete", RFC 4048,
              DOI 10.17487/RFC4048, April 2005,

   [RFC4193]  Hinden, R. and B. Haberman, "Unique Local IPv6 Unicast
              Addresses", RFC 4193, DOI 10.17487/RFC4193, October 2005,

   [RFC4291]  Hinden, R. and S. Deering, "IP Version 6 Addressing
              Architecture", RFC 4291, DOI 10.17487/RFC4291, February
              2006, <>.

   [RFC4548]  Gray, E., Rutemiller, J., and G. Swallow, "Internet Code
              Point (ICP) Assignments for NSAP Addresses", RFC 4548,
              DOI 10.17487/RFC4548, May 2006,

   [RFC5180]  Popoviciu, C., Hamza, A., Van de Velde, G., and D.
              Dugatkin, "IPv6 Benchmarking Methodology for Network
              Interconnect Devices", RFC 5180, DOI 10.17487/RFC5180, May
              2008, <>.

   [RFC6724]  Thaler, D., Ed., Draves, R., Matsumoto, A., and T. Chown,
              "Default Address Selection for Internet Protocol Version 6
              (IPv6)", RFC 6724, DOI 10.17487/RFC6724, September 2012,

   [RFC6890]  Cotton, M., Vegoda, L., Bonica, R., Ed., and B. Haberman,
              "Special-Purpose IP Address Registries", BCP 153,
              RFC 6890, DOI 10.17487/RFC6890, April 2013,

Authors' Addresses

   Ed Horley

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Internet-Draft      Expanding the IPv6 Lab Use Space        January 2022


   Tom Coffeen


   Scott Hogg


   Nick Buraglio
   Energy Sciences Network


   Chris Cummings
   Energy Sciences Network


   Kevin Myers
   IP ArchiTechs


   Russ White
   Juniper Networks


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