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The IPv4 Subnet Selection Option for DHCP (RFC3011)

IP.com Disclosure Number: IPCOM000005203D
Original Publication Date: 2000-Nov-01
Included in the Prior Art Database: 2001-Aug-17
Document File: 8 page(s) / 14K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Waters: AUTHOR

Abstract

This memo defines a new Dynamic Host Configuration Protocol (DHCP) option for selecting the subnet on which to allocate an address. This option would override a DHCP server's normal methods of selecting the subnet on which to allocate an address for a client.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 24% of the total text.

Network Working Group G. Waters Request for Comments: 3011 Nortel Networks Category: Standards Track November 2000

The IPv4 Subnet Selection Option for DHCP

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 (2000). All Rights Reserved.

Abstract

This memo defines a new Dynamic Host Configuration Protocol (DHCP) option for selecting the subnet on which to allocate an address. This option would override a DHCP server's normal methods of selecting the subnet on which to allocate an address for a client.

Table of Contents

1. Introduction..................................................1 1.1. Motivational Example........................................2 2. Subnet Selection Option Definition............................3 3. Intellectual Property.........................................4 4. IANA Considerations...........................................4 5. Acknowledgements..............................................5 6. Security Considerations.......................................5 7. References....................................................5 8. Editor's Addresses............................................6 9. Full Copyright Statement......................................7

1. Introduction

The Dynamic Host Configuration Protocol (DHCP) [RFC2131] provides a framework for passing configuration information to hosts on a TCP/IP network. RFC 2132 [RFC2132] specifies DHCP option configuration information that may be carried in DHCP packets to/from the DHCP server and the DHCP client. This document specifies a new DHCP option.

Waters Standards Track [Page 1]

RFC 3011 Subnet Selection Option November 2000

To select the subnet on which to allocate an address, the DHCP server determines the subnet from which the request originated, and then selects an address on the originating subnet or on a subnet that is on the same network segment as the originating subnet. The subnet from which the request originates can be determined by:

o Using the subnet address of the giaddr field in the DHCP packet

header, or if the giaddr field is zero;

o Using the subnet address of the local interface on which the DHCP

server received the packet.

This memo defines a new DHCP option, the subnet selection option, which allows the DHCP client to specify the subnet on which to allocate an address. This option takes precedence over the methods that the DHCP server uses to determine the subnet on which to select an address.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

1.1. Motivational Example

An example of...