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DHCP Relay Agent Information Option (RFC3046)

IP.com Disclosure Number: IPCOM000005240D
Original Publication Date: 2001-Jan-01
Included in the Prior Art Database: 2001-Aug-20
Document File: 15 page(s) / 31K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Patrick: AUTHOR

Abstract

Newer high-speed public Internet access technologies call for a high-speed modem to have a local area network (LAN) attachment to one or more customer premise hosts. It is advantageous to use the Dynamic Host Configuration Protocol (DHCP) as defined in RFC 2131 to assign customer premise host IP addresses in this environment. However, a number of security and scaling problems arise with such "public" DHCP use. This document describes a new DHCP option to address these issues. This option extends the set of DHCP options as defined in RFC 2132.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 11% of the total text.

Network Working Group M. Patrick Request for Comments: 3046 Motorola BCS Category: Standards Track January 2001

DHCP Relay Agent Information Option

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 Internet Society (2001). All Rights Reserved.

Abstract

Newer high-speed public Internet access technologies call for a high-speed modem to have a local area network (LAN) attachment to one or more customer premise hosts. It is advantageous to use the Dynamic Host Configuration Protocol (DHCP) as defined in RFC 2131 to assign customer premise host IP addresses in this environment. However, a number of security and scaling problems arise with such "public" DHCP use. This document describes a new DHCP option to address these issues. This option extends the set of DHCP options as defined in RFC 2132.

The new option is called the Relay Agent Information option and is inserted by the DHCP relay agent when forwarding client-originated DHCP packets to a DHCP server. Servers recognizing the Relay Agent Information option may use the information to implement IP address or other parameter assignment policies. The DHCP Server echoes the option back verbatim to the relay agent in server-to-client replies, and the relay agent strips the option before forwarding the reply to the client.

The "Relay Agent Information" option is organized as a single DHCP option that contains one or more "sub-options" that convey information known by the relay agent. The initial sub-options are defined for a relay agent that is co-located in a public circuit access unit. These include a "circuit ID" for the incoming circuit, and a "remote ID" which provides a trusted identifier for the remote high-speed modem.

Patrick Standards Track [Page 1]

RFC 3046 DHCP Relay Agent Information Option January 2001

Table of Contents

1 Introduction........................................... 2 1.1 High-Speed Circuit Switched Data Networks.............. 2 1.2 DHCP Relay Agent in the Circuit Access Equipment....... 4 2.0 Relay Agent Information Option......................... 5 2.1 Agent Operation........................................ 6 2.1.1 Reforwarded DHCP requests............................ 7 2.2 Server Operation....................................... 7 3.0 Relay Agent Information Suboptions..................... 8 3.1 Agent Circuit ID....................................... 8 3.2 Agent Remote ID........................................ 9 4.0 Issues Resolved........................................ 9 5.0 Security Considerations................................ 10 6.0 IANA Considerations.................................... 11 7.0 Intellectual Property Notice.............................