Reclassifying Dynamic Host Configuration Protocol version 4 (DHCPv4) Options
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From: The IESG <email@example.com> To: IETF-Announce <firstname.lastname@example.org> Cc: Internet Architecture Board <email@example.com>, RFC Editor <firstname.lastname@example.org>, dhc mailing list <email@example.com>, dhc chair <firstname.lastname@example.org> Subject: Protocol Action: 'Reclassifying DHCPv4 Options' to Proposed Standard The IESG has approved the following document: - 'Reclassifying DHCPv4 Options ' <draft-ietf-dhc-reclassify-options-02.txt> as a Proposed Standard This document is the product of the Dynamic Host Configuration Working Group. The IESG contact persons are Margaret Wasserman and Mark Townsley. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-dhc-reclassify-options-02.txt
Technical Summary The DHCPv4 option codes defined for public use in RFC 2131 and RFC 2132, option codes 1-127, are nearly all assigned to DHCP options.Â Efforts such as the reclamation of unused DHCP option codes in RFC 3679 help to extend the life of the option code space, but ultimately the space is expected to be exhausted. This document reclassifies much of the site-specific option range, option codes 128-254, which has not been widely used for its original intended purpose, to be used as option codes for publicly defined DHCP options.' There are known to be some devices that use options in the range of 128-254 in undocumented ways.Â This document defines a process through which an option code is provisionally marked as a candidate for assignment to a DHCP option and subject to public review and comment before actual assignment.Â Vendors will be encouraged to bring forward specifications for options that currently use option codes that are reclassified by this document. Working Group Summary The dhc WG reviewed several alternative mechanisms for extending the option code space before choosing the mechanism specified in this document.Â The other mechanisms were described in earlier drafts of the document.Â The WG reviewed the alternatives in two WG meetings and on the WG mailing list. Protocol Quality The mechanism for review and reclassification of option codes in this document allows for public review of reclassifed option codes to avoid conflict with the use of DHCP option codes by existing and deployed devices. This document was reviewed for the IESG by Margaret Wasserman.