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Modification to Default Values of SOL_MAX_RT and INF_MAX_RT
RFC 7083

Internet Engineering Task Force (IETF)                          R. Droms
Request for Comments: 7083                                 Cisco Systems
Updates: 3315                                              November 2013
Category: Standards Track
ISSN: 2070-1721

      Modification to Default Values of SOL_MAX_RT and INF_MAX_RT

Abstract

   This document updates RFC 3315 by redefining the default values for
   SOL_MAX_RT and INF_MAX_RT and defining options through which a DHCPv6
   server can override the client's default value for SOL_MAX_RT and
   INF_MAX_RT with new values.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7083.

Copyright Notice

   Copyright (c) 2013 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
   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.

Droms                        Standards Track                    [Page 1]
RFC 7083                DHCPv6 SOL_MAX_RT Option           November 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  Updates to SOL_MAX_RT and INF_MAX_RT in RFC 3315  . . . . . .   2
   4.  SOL_MAX_RT option . . . . . . . . . . . . . . . . . . . . . .   3
   5.  INF_MAX_RT Option . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Updates for SOL_MAX_RT and INF_MAX_RT Options to RFC 3315 . .   4
   7.  DHCPv6 Client Behavior  . . . . . . . . . . . . . . . . . . .   5
   8.  DHCPv6 Server Behavior  . . . . . . . . . . . . . . . . . . .   6
   9.  DHCPv6 Relay Agent Behavior . . . . . . . . . . . . . . . . .   6
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   6
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     13.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     13.2.  Informative References . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Section 5.5 of the DHCPv6 specification [RFC3315] defines the default
   values of SOL_MAX_RT and INF_MAX_RT to be 120 seconds.  In some
   circumstances, these defaults will lead to an unacceptably high
   volume of aggregated traffic at a DHCPv6 server.

   The change to SOL_MAX_RT is in response to DHCPv6 message rates
   observed on a DHCPv6 server in a deployment in which many DHCPv6
   clients are sending Solicit messages, but the DHCPv6 server has been
   configured not to respond to those Solicit messages.  While no
   explicit observations of traffic due to INF_MAX_RT have been
   conducted, this document updates INF_MAX_RT for consistency with
   SOL_MAX_RT.

2.  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].

3.  Updates to SOL_MAX_RT and INF_MAX_RT in RFC 3315

   This document changes Section 5.5 of RFC 3315 as follows:

   OLD:
      SOL_MAX_RT      120 secs  Max Solicit timeout value

   NEW:
      SOL_MAX_RT     3600 secs  Max Solicit timeout value

Droms                        Standards Track                    [Page 2]
RFC 7083                DHCPv6 SOL_MAX_RT Option           November 2013

   OLD:
      INF_MAX_RT      120 secs  Max Information-request timeout value

   NEW:
      INF_MAX_RT     3600 secs  Max Information-request timeout value

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