Network Working Group R. Droms
Internet-Draft Cisco Systems
Expires: December 26, 2003 June 27, 2003
Unused DHCP Option Codes
draft-ietf-dhc-unused-optioncodes-04
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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This Internet-Draft will expire on December 26, 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 will be used to confirm that these option codes can be
reused for other DHCP options in the future.
1. Introduction
This document lists the unused DHCP option codes from the IANA list
of BOOTP and DHCP option codes [1]. Each option code includes any
known documentation and contact information from the IANA list.
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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 [4]
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
Defined in: (expired Internet-Draft)
Contact: Mike Carney
Reason to recover: Never published as standard and not in general use
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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
2.7 LDAP Servers
Code: 95
Name: LDAP Servers
Defined in: (none)
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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
Defined in: (expired Internet-Draft)
Contact: Baiju Patel, Munil Shah
Reason to recover: Never published as standard and not in general use
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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; agress 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
2.14 URL
Code: 114
Name: URL
Defined in: (none)
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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" [5]
Contact: Kim Kinnear
Reason to recover: Current version of "DHCP Failover Protocol" does
not use a DHCP option
3. Option codes used in PXE Specification
The following option codes are used in the "Preboot Execution
Environment (PXE) Specification, Version 2.1" [2]. 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 Client System
Code: 93
Name: Client System
Defined in: "Preboot Execution Environment (PXE)
Specification, Version 2.1" [2]
Contact: Michael Johnston
3.2 Client NDI
Code: 94
Name: Client NDI
Defined in: "Preboot Execution Environment (PXE)
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Specification, Version 2.1" [2]
Contact: Michael Johnston
3.3 UUID/GUID Client Identifier
Code: 97
Name: UUID/GUID Client Identifier
Defined in: "Preboot Execution Environment (PXE)
Specification, Version 2.1" [2] (and an expired Internet-Draft)
Contact: Dan Harrington, Michael Johnston
4. Option Code Extensions
Note that these option codes are identified in draft-volz-dhc-
extended-optioncodes-00 [3] 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
Defined in: (expired Internet-Draft)
Contact: Ralph Droms
Reason to recover: Never published as standard; note that these
option codes are mentioned in "Extending DHCP Options Codes" [3].
5. Already Returned for Reassignment
The option codes 99, 102-107, 109 and 111 have already been returned
for reassignment to future DHCP options.
6. 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].
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Normative References
[1] Assigned Numbers Editor, IANA., "BOOTP and DHCP Parameters",
http://www.iana.org/assignments/bootp-dhcp-parameters,
February 2003.
[2] Intel Corporation, "Preboot Execution Environment (PXE)
Specification Version 2.1",
http://www.pix.net/software/pxeboot/archive/pxespec.pdf,
September 1999.
[3] Volz, B., Droms, R. and T. Lemon, "Extending DHCP Options
Codes", draft-volz-dhc-extended-optioncodes-00.txt (work in
progress), September 2000.
Informative References
[4] Patrick, M., "DHCP Relay Agent Information Option", RFC 3046,
January 2001.
[5] 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.
[6] Droms, R., "Procedures and IANA Guidelines for Definition of New
DHCP Options and Message Types", BCP 43, RFC 2939, September
2000.
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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Funding for the RFC Editor function is currently provided by the
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