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
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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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