Issues with multiple stateful DHCPv6 options
draft-ietf-dhc-dhcpv6-stateful-issues-00

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Last updated 2012-05-06
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Network Working Group                                           O. Troan
Internet-Draft                                                   B. Volz
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: November 8, 2012                                    May 7, 2012

              Issues with multiple stateful DHCPv6 options
              draft-ietf-dhc-dhcpv6-stateful-issues-00.txt

Abstract

   Dynamic Host Configuration Protocol for IPv6 (DHCPv6) was not written
   with the expectation that additional stateful DHCPv6 options would be
   developed.  IPv6 Prefix Options for Dynamic Host Configuration
   Protocol (DHCP) version 6 shoe-horned the new options for Prefix
   Delegation into DHCPv6.  Implementation experience of the CPE model
   described in has shown multiple issues with the DHCPv6 protocol in
   supporting multiple stateful options.

Status of this Memo

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   This Internet-Draft will expire on November 8, 2012.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Handling of multiple IA options types . . . . . . . . . . . . . 4
     4.1.  Advertisement message . . . . . . . . . . . . . . . . . . . 4
     4.2.  Placement of Status codes . . . . . . . . . . . . . . . . . 5
     4.3.  T1/T2 timers  . . . . . . . . . . . . . . . . . . . . . . . 5
     4.4.  Confirm message . . . . . . . . . . . . . . . . . . . . . . 6
     4.5.  Release messages  . . . . . . . . . . . . . . . . . . . . . 6
     4.6.  Unanswered options  . . . . . . . . . . . . . . . . . . . . 6
     4.7.  Multiple provisioning domains . . . . . . . . . . . . . . . 7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 8
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 8

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1.  Introduction

   DHCPv6 [RFC3315] was not written with the expectation that additional
   stateful DHCPv6 options would be developed.  DHCPv6 Prefix Delegation
   [RFC3633] shoe-horned the new options for Prefix Delegation into
   DHCPv6.  Implementation experience of the CPE model described in
   [RFC6204] has shown multiple issues with the DHCPv6 protocol in
   supporting multiple stateful options.

   This document describes a number of problems encountered with
   multiple IA option types into DHCP and recommended changes to the
   DHCPv6 protocol specifications.

   The intention of this work is to modify the DHCP protocol
   specification to support multiple IA option types within a single
   DHCP session.  This problem can also be solved by implementing a
   separate DHCP session (separate client state machine) per IA option
   type.  This latter approach has a number of issues: additional DHCP
   protocol traffic, 'collisions' between stateless options also
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