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Link Selection sub-option for the Relay Agent Information Option for DHCPv4

The information below is for an old version of the document that is already published as an RFC.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 3527.
Authors Jay Kumarasamy , Jay Kumarasamy , Kim Kinnear
Last updated 2013-03-02 (Latest revision 2002-10-28)
RFC stream Internet Engineering Task Force (IETF)
Additional resources Mailing list discussion
Stream WG state (None)
Document shepherd (None)
IESG IESG state RFC 3527 (Proposed Standard)
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD Dr. Thomas Narten
IESG note 2003-04-24: Published at RFC 3527
Send notices to <>
A new Request for Comments is now available in online RFC libraries.

        RFC 3527

        Title:      Link Selection sub-option
                    for the Relay Agent Information Option for DHCPv4
        Author(s):  K. Kinnear, M. Stapp, R. Johnson, J. Kumarasamy
        Status:     Standards Track
        Date:       April 2003
        Pages:      9
        Characters: 16831
        Updates/Obsoletes/SeeAlso:  None

        I-D Tag:    draft-ietf-dhc-agent-subnet-selection-04.txt


This document describes the link selection sub-option of the
relay-agent-information option for the Dynamic Host Configuration
Protocol (DHCPv4).  The giaddr specifies an IP address which
determines both a subnet, and thereby a link on which a Dynamic Host
Configuration Protocol (DHCP) client resides as well as an IP address
that can be used to communicate with the relay agent.  The
subnet-selection option allows the functions of the giaddr to be split
so that when one entity is performing as a DHCP proxy, it can specify
the subnet/link from which to allocate an IP address, which is
different from the IP address with which it desires to communicate
with the DHCP server.  Analogous situations exist where the relay
agent needs to specify the subnet/link on which a DHCP client resides,
which is different from an IP address that can be used to communicate
with the relay agent.

This document is a product of the Dynamic Host Configuration Working
Group of the IETF.

This is now a Proposed Standard Protocol.

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
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