TFTP Server Address Option for DHCPv4
RFC 5859
| Document | Type |
RFC - Informational
(June 2010; No errata)
Was draft-raj-dhc-tftp-addr-option (individual in int area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5859 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Jari Arkko | ||
| Send notices to | dhc-chairs@ietf.org | ||
Internet Engineering Task Force (IETF) R. Johnson
Request for Comments: 5859 Cisco Systems, Inc.
Category: Informational June 2010
ISSN: 2070-1721
TFTP Server Address Option for DHCPv4
Abstract
This memo documents existing usage for the "TFTP Server Address"
option. The option number currently in use is 150. This memo
documents the current usage of the option in agreement with RFC 3942,
which declares that any pre-existing usages of option numbers in the
range 128-223 should be documented, and the Dynamic Host
Configuration working group will try to officially assign those
numbers to those options. The option is defined for DHCPv4 and works
only with IPv4 addresses.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5859.
Johnson Informational [Page 1]
RFC 5859 TFTP Server Address June 2010
Copyright Notice
Copyright (c) 2010 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
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the Trust Legal Provisions and are provided without warranty as
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This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
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Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
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it for publication as an RFC or to translate it into languages other
than English.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. TFTP Server Address Option Definition . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1. Normative References . . . . . . . . . . . . . . . . . . . 5
6.2. Informative References . . . . . . . . . . . . . . . . . . 6
Johnson Informational [Page 2]
RFC 5859 TFTP Server Address June 2010
1. Introduction
Voice over IP (VoIP) devices, such as IP phones, have a need to
download their configuration from a configuration server on the
network. There are two commonly accepted methods to discover this
server via DHCP; the "sname" field in the DHCP header [RFC2131] and
the "TFTP Server Name" option (66) [RFC2132]. Both of these sources
of information, however, contain the TFTP server's hostname. That
hostname must then be translated to an IP address. The usual method
to accomplish this would be DNS [RFC1034]. This means the firmware
in a VoIP device (with possibly limited flash, memory, and/or
processing resources) would need to implement the DNS protocol in
order to perform this translation. This would also introduce an
additional unnecessary point of failure whereby the device is
dependent on the DNS server infrastructure in order to boot up and
communicate with its call agent.
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