The DHCPv4 Relay Agent Identifier Sub-Option
RFC 6925
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RFC - Proposed Standard
(April 2013; No errata)
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Last updated |
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2015-10-14
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IETF
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plain text
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WG Document
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RFC 6925 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Responsible AD |
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Ralph Droms
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Ted Lemon (ted.lemon@nominum.com) is the document shepherd.
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Send notices to |
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Internet Engineering Task Force (IETF) B. Joshi
Request for Comments: 6925 R. Desetti
Category: Standards Track Infosys Ltd.
ISSN: 2070-1721 M. Stapp
Cisco Systems, Inc.
April 2013
The DHCPv4 Relay Agent Identifier Sub-Option
Abstract
This document defines a new Relay Agent Identifier sub-option for the
Dynamic Host Configuration Protocol (DHCP) Relay Agent Information
option. The sub-option carries a value that uniquely identifies the
relay agent device within the administrative domain. The value is
normally administratively configured in the relay agent. The sub-
option allows a DHCP relay agent to include the identifier in the
DHCP messages it sends.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on
Internet Standards is available in 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/rfc6925.
Copyright Notice
Copyright (c) 2013 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Joshi, et al. Standards Track [Page 1]
RFC 6925 The Relay Agent ID Sub-Option April 2013
Table of Contents
1. Introduction ....................................................2
2. Terminology .....................................................2
3. Example Use Cases ...............................................3
3.1. Bulk Leasequery ............................................3
3.2. Industrial Ethernet ........................................3
4. Sub-Option Format ...............................................4
5. Identifier Stability ............................................4
5.1. Identifier Uniqueness ......................................5
6. Security Considerations .........................................6
6.1. Forged Relay ID Attacks ....................................6
6.2. Factory-Floor Scenario .....................................6
7. IANA Considerations .............................................7
8. Acknowledgments .................................................7
9. References ......................................................7
9.1. Normative References .......................................7
9.2. Informative References .....................................8
1. Introduction
The Dynamic Host Configuration Protocol for IPv4 (DHCPv4) [RFC2131]
provides IP addresses and configuration information for IPv4 clients.
It includes a relay agent capability, in which network elements
receive broadcast messages from clients and forward them to DHCP
servers as unicast messages. In many network environments, relay
agents add information to the DHCP messages before forwarding them,
using the Relay Agent Information option [RFC3046]. Servers that
recognize the Relay Agent Information option echo it back in their
replies.
This specification introduces a Relay Agent Identifier (Relay-ID)
sub-option for the Relay Agent Information option. The Relay-ID sub-
option carries a sequence of octets that is intended to uniquely
identify the relay agent within the administrative domain. In this
document, an administrative domain consists of all DHCP servers and
relay agents that communicate with each other.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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