Guidelines for Creating New DHCPv6 Options
draft-ietf-dhc-option-guidelines-08

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Document Type Active Internet-Draft (dhc WG)
Last updated 2012-06-19
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Dynamic Host Configuration Working                            D. Hankins
Group                                                             Google
Internet-Draft                                              T. Mrugalski
Intended status: Informational                              M. Siodelski
Expires: December 21, 2012                                           ISC
                                                                S. Jiang
                                            Huawei Technologies Co., Ltd
                                                             S. Krishnan
                                                                Ericsson
                                                           June 19, 2012

               Guidelines for Creating New DHCPv6 Options
                  draft-ietf-dhc-option-guidelines-08

Abstract

   This document provides guidance to prospective DHCPv6 Option
   developers to help them creating option formats that are easily
   adoptable by existing DHCPv6 software.

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 http://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 21, 2012.

Copyright Notice

   Copyright (c) 2012 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
   (http://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

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   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.  Requirements Language  . . . . . . . . . . . . . . . . . . . .  3
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  When to Use DHCPv6 . . . . . . . . . . . . . . . . . . . . . .  4
   4.  General Principles . . . . . . . . . . . . . . . . . . . . . .  4
   5.  Reusing Other Options  . . . . . . . . . . . . . . . . . . . .  5
     5.1.  Option with IPv6 addresses . . . . . . . . . . . . . . . .  5
     5.2.  Option with 32-bit integer value . . . . . . . . . . . . .  6
     5.3.  Option with 16-bit integer value . . . . . . . . . . . . .  7
     5.4.  Option with 8-bit integer value  . . . . . . . . . . . . .  7
     5.5.  Option with variable length data . . . . . . . . . . . . .  7
     5.6.  Option with DNS Wire Format Domain Name List . . . . . . .  8
   6.  Avoid Conditional Formatting . . . . . . . . . . . . . . . . .  9
   7.  Avoid Aliasing . . . . . . . . . . . . . . . . . . . . . . . .  9
   8.  Suboptions in DHCPv6 . . . . . . . . . . . . . . . . . . . . . 10
   9.  Additional States Considered Harmful . . . . . . . . . . . . . 11
   10. Is DHCPv6 dynamic? . . . . . . . . . . . . . . . . . . . . . . 11
   11. Multiple provisioning domains  . . . . . . . . . . . . . . . . 11
   12. Considerations for Creating New Formats  . . . . . . . . . . . 12
   13. Option Size  . . . . . . . . . . . . . . . . . . . . . . . . . 12
   14. Clients Request their Options  . . . . . . . . . . . . . . . . 13
   15. Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   16. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   17. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     17.1. Informative References . . . . . . . . . . . . . . . . . . 15
     17.2. Informative References . . . . . . . . . . . . . . . . . . 16
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

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1.  Requirements Language

   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 RFC 2119 [RFC2119].

2.  Introduction

   Most protocol developers ask themselves if a protocol will work, or
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