Network Working Group                                    F. Templin, Ed.
Internet-Draft                              Boeing Research & Technology
Updates: rfc4191, rfc4861 (if approved)                    June 04, 2018
Intended status: Standards Track
Expires: December 6, 2018


                            The AERO Address
                   draft-templin-6man-aeroaddr-02.txt

Abstract

   IPv6 interfaces are required to have a link-local address that is
   unique on the link.  Nodes normally derive a link local address
   through the use of IPv6 Stateless Address Autoconfiguration (SLAAC)
   and employ Duplicate Address Detection (DAD) to ensure uniqueness.
   This document presents a method for a node that obtains a delegated
   prefix to statelessly construct a link-local address (known as the
   "AERO address") that is assured to be unique on the link.

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 December 6, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   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 . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  The AERO Address  . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   IPv6 interfaces are required to have a link-local address that is
   unique on the link [RFC8200][RFC4861].  Nodes normally derive a link
   local address through the use of IPv6 StateLess Address Auto
   Configuration (SLAAC) and employ Duplicate Address Detection (DAD)
   [RFC4862] to ensure uniqueness.  This document presents a method for
   a node that obtains a delegated prefix to statelessly construct a
   link-local address (known as the "AERO address") that is assured to
   be unique on the link.

   Nodes that construct AERO addresses must have assurance that all
   other nodes on the link employ the same address autoconfiguration
   method.  This can be assured on links for which there is an
   "IPv6-over-(foo)" specfication that mandates use of AERO addresses
   (e.g., see: [I-D.templin-aerolink]).  Other link types can be
   administratively coordinated (e.g., via network management) to assure
   that only AERO addresses are used.

2.  Terminology

   The terminology in the normative references applies.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].  Lower case
   uses of these words are not to be interpreted as carrying RFC2119
   significance.




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3.  The AERO Address

   An AERO address is an IPv6 link-local address with an interface
   identifier based on a prefix that has been delegated to a node for
   its own exclusive use.  AERO addresses begin with the prefix
   fe80::/64 and include in the interface identifier (i.e., the lower 64
   bits) a 64-bit prefix taken from one of the node's delegated
   prefixes.  For example, if the node obtains the delegated prefix:

      2001:db8:1000:2000::/64

   it constructs its corresponding AERO addresses as:

      fe80::2001:db8:1000:2000

   After constructing the AERO address, the node can assign the address
   to the interface over which it received the prefix delegation.  Since
   the prefix delegation is already known to be unique, the node need
   not use Duplicate Address Detection (DAD) to test the AERO address
   for uniqueness.

   AERO addresses can be constructed for any IPv6 prefix that is no
   longer than /64.  For prefixes shorter than /64, the AERO address is
   constructed based on the lowest-numbered /64 prefix taken from the
   shorter prefix.  For example, if the node obtains the delegated
   prefix:

      2001:db8:1000:2000::/56

   it constructs its corresponding AERO addresses as:

      fe80::2001:db8:1000:2000

4.  Applicability

   The AERO address is intended for use by mobile networks that comprise
   a mobile router and a tethered network of "Internet of Things"
   devices that travel together with the router as a single unit.  The
   mobile router assigns the AERO address to its upstream interface over
   which it receives a prefix delegation from a delegating router.  The
   manner for receiving the delegated prefix could be through static
   configuration or some automated prefix delegation service.

   Many other use case scenarios are possible (e.g., home networks) but
   the above case extends to multitudes of applications, e.g., a cell
   phone and its associated devices, an airplane and its on-board
   network, etc.  A similar uses case exists for a mobile node that
   obtains a delegated prefix solely for its own internal multi-



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   addressing purposes.  These use cases are discussed in
   [I-D.templin-v6ops-pdhost].

5.  Implementation Status

   Public domain implementations exist that use the AERO address format
   as described in this document.

6.  IANA Considerations

   This document introduces no IANA considerations.

7.  Security Considerations

   TBD

8.  Acknowledgements

   This work is aligned with the NASA Safe Autonomous Systems Operation
   (SASO) program under NASA contract number NNA16BD84C.

   This work is aligned with the FAA as per the SE2025 contract number
   DTFAWA-15-D-00030.

   This work is aligned with the Boeing Information Technology (BIT)
   MobileNet program and the Boeing Research & Technology (BR&T)
   enterprise autonomy program.

9.  References

9.1.  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,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              DOI 10.17487/RFC4861, September 2007,
              <https://www.rfc-editor.org/info/rfc4861>.

   [RFC4862]  Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
              Address Autoconfiguration", RFC 4862,
              DOI 10.17487/RFC4862, September 2007,
              <https://www.rfc-editor.org/info/rfc4862>.





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   [RFC8200]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", STD 86, RFC 8200,
              DOI 10.17487/RFC8200, July 2017,
              <https://www.rfc-editor.org/info/rfc8200>.

9.2.  Informative References

   [I-D.templin-aerolink]
              Templin, F., "Asymmetric Extended Route Optimization
              (AERO)", draft-templin-aerolink-82 (work in progress), May
              2018.

   [I-D.templin-v6ops-pdhost]
              Templin, F., "IPv6 Prefix Delegation Models", draft-
              templin-v6ops-pdhost-20 (work in progress), May 2018.

Author's Address

   Fred L. Templin (editor)
   Boeing Research & Technology
   P.O. Box 3707
   Seattle, WA  98124
   USA

   Email: fltemplin@acm.org


























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