Network Working Group R. Droms
Internet-Draft Cisco Systems
Expires: October 15, 2003 April 16, 2003
Unused DHCP Option Codes
draft-ietf-dhc-unused-optioncodes-02
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 October 15, 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 Option Codes
The option codes listed in this section are to be returned to IANA
for reassignment to new options.
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
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
Defined in: (expired Internet-Draft)
Contact: Mike Carney
Reason to recover: Never published as standard
2.4 FQDNs in DHCP Options
Code: 89
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Name: FQDNs in DHCP Options
Defined in: (expired Internet-Draft)
Contact: Ralph Droms
Reason to recover: Never published as standard
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)
Contact: (none)
Reason to recover: Never published as Internet-Draft
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2.8 IPv6 Transition
Code: 96
Name: IPv6 Transition
Defined in: (expired Internet-Draft)
Contact: Dan Harrington
Reason to recover: Never published as standard
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
2.11 Swap Path
Code: 108
Name: Swap Path
Defined in: (none)
Contact: (none)
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Reason to recover: Never published as Internet-Draft
2.12 IPX Compatibility
Code: 110
Name: IPX Compatibility
Defined in: (none)
Contact: Juan Luciani
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)
Contact: Vinod Valloppillil
Reason to recover: Never published as Internet-Draft
2.15 Failover
Code: 115
Name: Failover
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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 used in PXE Specification
The following option codes are used in the "Preboot Execution
Environment (PXE) Specification, Version 2.1" [4]. However, none of
these option codes have been specified as a Standards-track RFC.
3.1 Client System
Code: 93
Name: Client System
Defined in: (none)
Contact: (none)
Reason to recover: Never published as Internet-Draft
3.2 Client NDI
Code: 94
Name: Client NDI
Defined in: (none)
Contact: (none)
Reason to recover: Never published as Internet-Draft
3.3 UUID/GUID Client Identifier
Code: 97
Name: UUID/GUID Client Identifier
Defined in: (expired Internet-Draft)
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Contact: Dan Harrington
Reason to recover: Never published as standard
4. Option Code Extensions
Note that these option codes are identified in draft-volz-dhc-
extended-optioncodes-00 [6] 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 as
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 [5].
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-
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ietf-dhc-failover-11.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] Droms, R., "Procedures and IANA Guidelines for Definition of New
DHCP Options and Message Types", BCP 43, RFC 2939, September
2000.
[6] Volz, B., Droms, R. and T. Lemon, "Extending DHCP Options Codes",
draft-volz-dhc-extended-optioncodes-00.txt (work in progress),
September 2000.
Author's Address
Ralph Droms
Cisco Systems
250 Apollo Drive
Chelmsford, MA 01824
USA
Phone: +1 978 497 4733
EMail: rdroms@cisco.com
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