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Versions: 00 01 02 03 04 05 06 07 RFC 3679

IPv6 Group                                                      R. Droms
Internet-Draft                                             Cisco Systems
Expires: November 30, 2003                                     June 2003


                        Unused DHCP Option Codes
                  draft-ietf-dhc-unused-optioncodes-05

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that other
   groups may also distribute working documents as Internet-Drafts.

   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."

   The list of current Internet-Drafts can be accessed at http://
   www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on November 30, 2003.

Copyright Notice

   Copyright (C) The Internet Society (2003). All Rights Reserved.

Abstract

   Prior to the publication of RFC2489 (which was updated by RFC2939),
   several option codes were assigned to proposed DHCP options that were
   subsequently never used. This document lists those unused option
   codes and directs IANA to make these option codes available for
   assignment to other DHCP options in the future.

   The document also lists several option codes that are not currently
   documented in an RFC but should not be made available for
   reassignment to future DHCP options.

1. Introduction

   Section 2 of this document lists the unused DHCP option codes from



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   the IANA list of BOOTP and DHCP option codes [1].  Each option code
   includes any known documentation and contact information from the
   IANA list.  IANA will make these option codes available for
   assignment to other DHCP options in the future.

   Section 3 lists several DHCP option codes that are not currently
   documented in an RFC but should not be made available for
   reassignment to future DHCP options.

2. Unused DHCP Option Codes to be Reassigned to Future DHCP Options

   The option codes listed in this section are to be returned to IANA
   for reassignment to new options.  Responses from associated contact
   persons are noted where they have been received.

2.1 Service Location Protocol Naming Authority

   Code:              80

   Name:              Service Location Protocol Naming Authority

   Defined in:        (expired Internet-Draft)

   Contact:           Charlie Perkins

   Reason to recover: Never published as standard and not in general use


2.2 Relay Agent Options

   Codes:             83, 84

   Name:              Relay Agent Options

   Defined in:        Early draft of RFC3046 [2]

   Contact:           (none)

   Reason to recover: Not defined in RFC3046 as published


2.3 IEEE 1003.1 POSIX Timezone

   Code:              88

   Name:              IEEE 1003.1 POSIX Timezone





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   Defined in:        (expired Internet-Draft)

   Contact:           Mike Carney

   Reason to recover: Never published as standard and not in general use


2.4 FQDNs in DHCP Options

   Code:              89

   Name:              FQDNs in DHCP Options

   Defined in:        (expired Internet-Draft)

   Contact:           Ralph Droms; agrees that option code should be
      reassigned

   Reason to recover: Never published as standard and not in general use


2.5 VINES TCP/IP Server

   Code:              91

   Name:              VINES TCP/IP Server

   Defined in:        (none)

   Contact:           (none)

   Reason to recover: Never published as Internet-Draft


2.6 Server Selection

   Code:              92

   Name:              Server Selection

   Defined in:        (none)

   Contact:           (none)

   Reason to recover: Never published as Internet-Draft






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2.7 LDAP Servers

   Code:              95

   Name:              LDAP Servers

   Defined in:        (none)

   Contact:           (none)

   Reason to recover: Never published as Internet-Draft


2.8 IPv6 Transition

   Code:              96

   Name:              IPv6 Transition

   Defined in:        (expired Internet-Draft)

   Contact:           Dan Harrington; agrees that option code should be
      reassigned

   Reason to recover: Never published as standard and not in general use


2.9 Printer Name

   Code:              100

   Name:              Printer Name

   Defined in:        (none)

   Contact:           (none)

   Reason to recover: Never published as Internet-Draft


2.10 Multicast Assignment through DHCP

   Code:              101

   Name:              Multicast Assignment through DHCP






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   Defined in:        (expired Internet-Draft)

   Contact:           Baiju Patel, Munil Shah

   Reason to recover: Never published as standard and not in general use


2.11 Swap Path

   Code:              108

   Name:              Swap Path

   Defined in:        (none)

   Contact:           (none)

   Reason to recover: Never published as Internet-Draft


2.12 IPX Compatibility

   Code:              110

   Name:              IPX Compatibility

   Defined in:        (none)

   Contact:           Juan Luciani; agrees that option code should be
      reassigned

   Reason to recover: Never published as Internet-Draft


2.13 Netinfo Parameters

   Codes:             112, 113

   Name:              Netinfo Address, Netinfo Tag

   Defined in:        (none)

   Contact:           Marc Majka

   Reason to recover: Never published as Internet-Draft






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2.14 URL

   Code:              114

   Name:              URL

   Defined in:        (none)

   Contact:           Vinod Valloppillil

   Reason to recover: Never published as Internet-Draft


2.15 Failover

   Code:              115

   Name:              Failover

   Defined in:        Early revisions of "DHCP Failover Protocol" [3]

   Contact:           Kim Kinnear

   Reason to recover: Current version of "DHCP Failover Protocol" does
      not use a DHCP option


3. Option codes to be reserved by IANA

   The option codes listed in this section are the subject of ongoing
   work in the dhc working group.  These options codes should remain on
   the IANA list of assigned option codes [1] until the dhc working
   group has made a final decision about their disposition.

3.1 Option codes used in PXE Specification

   The following option codes are used in the "Preboot Execution
   Environment (PXE) Specification, Version 2.1" [4].  However, although
   these options are in widespread use by devices that use PXE, none of
   these option codes have been described in a published RFC.

   The dhc WG will endeavor to have specifications for these options
   published.

3.1.1 Client System






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   Code:              93

   Name:              Client System

   Defined in:        "Preboot Execution Environment (PXE)
      Specification, Version 2.1" [4]

   Contact:           Michael Johnston


3.1.2 Client NDI

   Code:              94

   Name:              Client NDI

   Defined in:        "Preboot Execution Environment (PXE)
      Specification, Version 2.1" [4]

   Contact:           Michael Johnston


3.1.3 UUID/GUID Client Identifier

   Code:              97

   Name:              UUID/GUID Client Identifier

   Defined in:        "Preboot Execution Environment (PXE)
      Specification, Version 2.1" [4] (and an expired Internet-Draft)

   Contact:           Dan Harrington, Michael Johnston


3.2 Option Code Extensions

   Note that these option codes are identified in "Extending DHCP
   Options Codes" [5] as part of a mechanism for extending the set of
   option codes available to DHCP.  If these option codes are not used
   for DHCP option code extension, they will be returned to IANA for
   reassignment to other DHCP options.

   Codes:             126, 127

   Name:              Option Code Extensions






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   Defined in:        (expired Internet-Draft)

   Contact:           Ralph Droms


4. Already Returned for Reassignment

   The option codes 99, 102-107, 109 and 111 have already been returned
   for reassignment to future DHCP options.

5. IANA Considerations

   When this document has been published as an Informational RFC, IANA
   will be requested to return the unused DHCP option codes to the list
   of available option codes. These option codes may be reassigned to
   new DHCP options, according to the procedures in RFC 2939 [6].

Informative References

   [1]  Assigned Numbers Editor, IANA., "BOOTP and DHCP Parameters",
        http://www.iana.org/assignments/bootp-dhcp-parameters,
        February 2003.

   [2]  Patrick, M., "DHCP Relay Agent Information Option", RFC 3046,
        January 2001.

   [3]  Droms, R., Kinnear, K., Stapp, M., Volz, B., Gonczi, S., Rabil,
        G., Dooley, M. and A. Kapur, "DHCP Failover Protocol",
        draft-ietf-dhc-failover-12.txt (work in progress), November
        2002.

   [4]  Intel Corporation, "Preboot Execution Environment (PXE)
        Specification Version 2.1", http://www.pix.net/software/pxeboot/
        archive/pxespec.pdf, September 1999.

   [5]  Volz, B., Droms, R. and T. Lemon, "Extending DHCP Options
        Codes", draft-volz-dhc-extended-optioncodes-00.txt (work in
        progress), February 2003.

   [6]  Droms, R., "Procedures and IANA Guidelines for Definition of New
        DHCP Options and Message Types", BCP 43, RFC 2939, September
        2000.









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Author's Address

   Ralph Droms
   Cisco Systems
   1414 Massachusetts Avenue
   Boxborough, MA  01719
   USA

   Phone: +1 978 936 1674
   EMail: rdroms@cisco.com









































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   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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