Link-Layer Addresses Assignment Mechanism for DHCPv6
draft-bvtm-dhc-mac-assign-01

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Dynamic Host Configuration (DHC)                                 B. Volz
Internet-Draft                                                     Cisco
Intended status: Standards Track                            T. Mrugalski
Expires: November 15, 2018                                           ISC
                                                            May 14, 2018

          Link-Layer Addresses Assignment Mechanism for DHCPv6
                      draft-bvtm-dhc-mac-assign-01

Abstract

   In certain environments, e.g. large scale virtualization deployments,
   new devices are created in an automated manner.  Such devices
   typically have their link-layer (MAC) addresses randomized.  With
   sufficient scale, the likelihood of collision is not acceptable.
   Therefore an allocation mechanism is required.  This draft proposes
   an extension to DHCPv6 that allows a scalable approach to link-layer
   address assignments.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on November 15, 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
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Volz & Mrugalski        Expires November 15, 2018               [Page 1]
Internet-Draft    DHCPv6 Link-Layer Address Assignment          May 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.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Mechanism Overview  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Design Assumptions  . . . . . . . . . . . . . . . . . . . . .   6
   6.  Information Encoding  . . . . . . . . . . . . . . . . . . . .   6
   7.  Requesting Addresses  . . . . . . . . . . . . . . . . . . . .   7
   8.  Renewing Addresses  . . . . . . . . . . . . . . . . . . . . .   8
   9.  Releasing Addresses . . . . . . . . . . . . . . . . . . . . .   8
   10. Option Definitions  . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Identity Association for Link-Layer Addresses Option . .   8
     10.2.  Link-Layer Addresses Option  . . . . . . . . . . . . . .  10
   11. Client Behavior . . . . . . . . . . . . . . . . . . . . . . .  12
   12. Server Behavior . . . . . . . . . . . . . . . . . . . . . . .  12
   13. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   14. Security Considerations . . . . . . . . . . . . . . . . . . .  13
   15. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  13
   16. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     16.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     16.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Appendix A.  IEEE 802c Summary  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   There are several new deployment types that deal with a large number
   of devices that need to be initialized.  One of them is a scenario
   where virtual machines (VMs) are created on a massive scale.
   Typically the new VM instances are assigned a random link-layer (MAC)
   address, but that does not scale well due to the birthday paradox.
   Another use case is IoT devices.  Typically there is no need to
   provide global uniqueness of MAC addresses for such devices.  On the
   other hand, the huge number of such devices would likely exhaust a
   vendor's OUI (Organizationally Unique Identifier) global address
   space.  For those reasons, it is desired to have some form of local
   authority that would be able to assign MAC addresses.

   This document proposes a new mechanism that extends DHCPv6 operation
   to handle link-layer address assignments.