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 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 December 6, 2018. 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 Templin Expires December 6, 2018 [Page 1] Internet-Draft AERO Address June 2018 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. Templin Expires December 6, 2018 [Page 2] Internet-Draft AERO Address June 2018 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- Templin Expires December 6, 2018 [Page 3] Internet-Draft AERO Address June 2018 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, . [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, . [RFC4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless Address Autoconfiguration", RFC 4862, DOI 10.17487/RFC4862, September 2007, . Templin Expires December 6, 2018 [Page 4] Internet-Draft AERO Address June 2018 [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", STD 86, RFC 8200, DOI 10.17487/RFC8200, July 2017, . 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 Templin Expires December 6, 2018 [Page 5]