IANA Allocation Guidelines for the Address Resolution Protocol (ARP)
RFC 5494
Document | Type |
RFC - Proposed Standard
(April 2009; No errata)
Updates RFC 951, RFC 2131, RFC 2132, RFC 1044, RFC 2834, RFC 1329, RFC 826, RFC 4361, RFC 2835, RFC 3315, RFC 2225, RFC 2176, RFC 4701, RFC 4338
Was draft-arkko-arp-iana-rules (individual in gen area)
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Authors | Jari Arkko , Carlos Pignataro | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5494 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Russ Housley | ||
Send notices to | (None) |
Network Working Group J. Arkko Request for Comments: 5494 Ericsson Updates: 826, 951, 1044, 1329, 2131, C. Pignataro 2132, 2176, 2225, 2834, 2835, Cisco Systems 3315, 4338, 4361, 4701 April 2009 Category: Standards Track IANA Allocation Guidelines for the Address Resolution Protocol (ARP) Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (c) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Abstract This document specifies the IANA guidelines for allocating new values in the Address Resolution Protocol (ARP). This document also reserves some numbers for experimentation purposes. The changes also affect other protocols that employ values from the ARP name spaces. Arkko & Pignataro Standards Track [Page 1] RFC 5494 ARP IANA Rules April 2009 1. Introduction This document specifies the IANA guidelines [RFC5226] for allocating new values for various fields in the Address Resolution Protocol (ARP) [RFC0826]. The change is also applicable to extensions of ARP that use the same message format, such as [RFC0903], [RFC1931], and [RFC2390]. The change also affects other protocols that employ values from the ARP name spaces. For instance, the ARP hardware address type (ar$hrd) number space is also used in the "htype" (hardware address type) fields in the Bootstrap Protocol (BOOTP) [RFC0951] and Dynamic Host Configuration Protocol (DHCP) [RFC2131], as well as in the "hardware type" field in the DHCP Unique Identifiers in DHCPv6 [RFC3315]. These protocols are therefore affected by the update in the IANA rules. Other affected specifications include the specialized address resolution mechanisms in: o HYPERchannel [RFC1044] o DHCP options [RFC2132] [RFC4361] o ATM (Asynchronous Transfer Mode) ARP [RFC2225] o HARP (High-Performance Parallel Interface ARP) [RFC2834] [RFC2835] o Dual MAC (Media Access Control) FDDI (Fiber Distributed Data Interface) ARP [RFC1329] o MAPOS (Multiple Access Protocol over Synchronous Optical Network/ Synchronous Digital Hierarchy) ARP [RFC2176] o FC (Fibre Channel) ARP [RFC4338] o DNS DHCID Resource Record [RFC4701] The IANA guidelines are given in Section 2. Previously, no IANA guidance existed for such allocations. The purpose of this document is to allow IANA to manage number assignments based on these guidelines in a consistent manner. This document also reserves some numbers for experimentation purposes. These numbers are given in Section 3. Arkko & Pignataro Standards Track [Page 2] RFC 5494 ARP IANA Rules April 2009 2. IANA Considerations The following rules apply to the fields of ARP: ar$hrd (16 bits) Hardware address space Requests for ar$hrd values below 256 or for a batch of more than one new value are made through Expert Review [RFC5226]. Note that certain protocols, such as BOOTP and DHCPv4, employ these values within an 8-bit field. The expert should determine that a need to allocate the new values exists and that the existing values are insufficient to represent the new hardware address types. The expert should also determine the applicability of the request and assign values higher than 255 for requests that do not apply to BOOTP/DHCPv4. Similarly, the expert should assign 1-octet values for requests that apply to BOOTP/DHCPv4, as for example the "IPsec tunnel" with value 31 [RFC3456]. Conversely, ARP-only uses, without a foreseeable reason to use the same value in BOOTP/DHCPv4, should favor 2-octet values. Requests for individual new ar$hrd values that do not specify a value, or where the requested value is greater than 255, are made through First Come First Served [RFC5226]. The assignment will always result in a 2-octet value. ar$pro (16 bits) Protocol address spaceShow full document text