Network Working Group R. Droms Request for Comments: 3679 Cisco Systems Category: Informational January 2004 Unused Dynamic Host Configuration Protocol (DHCP) Option Codes Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2004). All Rights Reserved.
AbstractPrior to the publication of RFC 2489 (which was updated by RFC 2939), several option codes were assigned to proposed Dynamic Host Configuration Protocol (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. Section 2 of this document lists the unused DHCP option codes from the IANA list of BOOTP and DHCP option codes . 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.
3] Contact: Kim Kinnear Reason to recover: Current version of "DHCP Failover Protocol" does not use a DHCP option 1] until the DHC WG has made a final decision about their disposition. 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. 4] Contact: Michael Johnston (email@example.com) 4] Contact: Michael Johnston (firstname.lastname@example.org)
4] (and an expired Internet-Draft) Contact: Dan Harrington, Michael Johnston (email@example.com)
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 Defined in: (expired Internet-Draft) Contact: Ralph Droms Section 2 to the list of available option codes. These option codes may be reassigned to new DHCP options, according to the procedures in RFC 2939 . IANA is requested to reassign these option codes after the list of option codes that have never been assigned or have previously been returned has been exhausted.  Assigned Numbers Editor, IANA., "BOOTP and DHCP Parameters", http://www.iana.org/assignments/bootp-dhcp-parameters, February 2003.  Patrick, M., "DHCP Relay Agent Information Option", RFC 3046, January 2001.  Droms, R., Kinnear, K., Stapp, M., Volz, B., Gonczi, S., Rabil, G., Dooley, M. and A. Kapur, "DHCP Failover Protocol", Work in Progress.  Intel Corporation, "Preboot Execution Environment (PXE) Specification Version 2.1", http://www.pix.net/software/pxeboot/ archive/pxespec.pdf, September 1999.
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