Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration Information
RFC 4776
Document | Type |
RFC - Proposed Standard
(November 2006; No errata)
Obsoletes RFC 4676
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Author | Henning Schulzrinne | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4776 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) |
Network Working Group H. Schulzrinne Request for Comments: 4776 Columbia U. Obsoletes: 4676 November 2006 Category: Standards Track Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration Information 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) The IETF Trust (2006). RFC Editor Note RFC 4776 is being published to correct an error in the assignment of the numeric value of the DHCPv6 option-code in RFC 4676 (Section 3.2). This document obsoletes RFC 4676. Abstract This document specifies a Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) option containing the civic location of the client or the DHCP server. The Location Configuration Information (LCI) includes information about the country, administrative units such as states, provinces, and cities, as well as street addresses, postal community names, and building information. The option allows multiple renditions of the same address in different scripts and languages. Schulzrinne Standards Track [Page 1] RFC 4776 DHCP Civic November 2006 Table of Contents 1. Introduction ....................................................2 2. Terminology .....................................................5 3. Format of the DHCP Civic Location Option ........................5 3.1. Overall Format for DHCPv4 ..................................5 3.2. Overall Format for DHCPv6 ..................................6 3.3. Element Format .............................................7 3.4. Civic Address Components ...................................7 4. Postal Addresses ...............................................13 5. Example ........................................................14 6. Security Considerations ........................................15 7. IANA Considerations ............................................15 8. References .....................................................16 8.1. Normative References ......................................16 8.2. Informative References ....................................17 Acknowledgements ..................................................17 1. Introduction Many end system services can benefit by knowing the approximate location of the end device. In particular, IP telephony devices need to know their location to contact the appropriate emergency response agency and to be found by emergency responders. There are two common ways to identify the location of an object, either through geospatial coordinates or by so-called civic addresses. Geospatial coordinates indicate longitude, latitude, and altitude, while civic addresses indicate a street address. The civic address is commonly, but not necessarily, closely related to the postal address, used by the local postal service to deliver mail. However, not all postal addresses correspond to street addresses. For example, the author's address is a postal address that does not appear on any street or building sign. Naturally, post office boxes would be unsuitable for the purposes described here. The term 'civil address' or 'jurisdictional address' is also sometimes used instead of civic address. This document mainly supports civic addresses, but allows the postal community name to be indicated if it differs from the civic name. A related document [15] describes a DHCPv4 [2] option for conveying geospatial information to a device. This document describes how DHCPv4 and DHCPv6 [6] can be used to convey the civic and postal address to devices. Both geospatial and civic formats can be used simultaneously, increasing the chance to deliver accurate and timely Schulzrinne Standards Track [Page 2] RFC 4776 DHCP Civic November 2006 location information to emergency responders. The reader should also be familiar with the concepts in [11], as many of the protocol elements below are designed to dovetail with PIDF-LO elements. This document only defines the delivery of location information from the DHCP server to the client, due to security concerns related to using DHCP to update the database. Within the GEOPRIV architecture as defined by RFC 3693 [9], the defined mechanism in this documentShow full document text