Internet DRAFT - draft-yuchi-dhc-homeagent-option
draft-yuchi-dhc-homeagent-option
DHC WG Ma Yuzhi
Internet Draft Huawei Technologies CO.,LTD
Expires: April 12, 2006 October 13, 2005
Home Agent Configuration Option for DHCPv6
draft-yuchi-dhc-homeagent-option-00.txt
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Copyright Notice
Copyright (C) The Internet Society (2005). All Rights Reserved.
Abstract
This document defines a new home agent option for the Dynamic Host
Configuration Protocol for IPv6 (DHCPv6). To assist with rapid
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handovers the option allows a mobile node (DHCPv6 client) to acquire
a list of home agent addresses from a DHCPv6 server.
Table of Contents
1. Introduction.................................................2
2. Terminology..................................................3
3. Home Agent Option............................................3
4. Client behavior..............................................4
5. Server behavior..............................................4
6. Relay agent behavior.........................................5
7. IANA Considerations..........................................5
8. Security Considerations......................................5
9. Acknowledgments..............................................5
10. References..................................................6
10.1. Normative References...................................6
10.2. Informative References.................................6
Author's Addresses..............................................6
Intellectual Property Statement.................................6
Disclaimer of Validity..........................................7
Copyright Statement.............................................7
Acknowledgment..................................................7
1. Introduction
In Mobile IPv6, a mobile node needs to acquire its home address,
care-of address and home agent addresses. While away from home, the
mobile node registers its care-of address to its home agent, and then
the mobile node can communicate with a correspondent node. There are
two modes for communications between the mobile node and a
correspondent node. The first mode is bidirectional tunneling and the
second mode is route optimization. The mobile node can acquire its
home address or care-of address through conventional IPv6 mechanisms,
such as stateless or stateful auto-configuration.
The basic idea in Mobile IP is to allow a home agent to work as
a stationary proxy for a mobile node. In a Mobile IPv6 network
having steady home links, home agents can be configured on a DHCPv6
server, then a mobile node can acquire its home agent addresses when
it requests its home address from DHCPv6 server. It also can acquire
its home agent addresses when a mobile node is away from its home
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network and requests its care-of address. To assist with rapid
handovers, this document defines a new home agent option which can
be used to acquire a mobile node's home agent addresses.
2. Terminology
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 RFC-2119 [1].
Throughout this document, unless otherwise specified, the acronym
DHCP refers to DHCP for IPv6 (DHCPv6) as specified in RFC 3315.
This document uses terminology specific to IPv6 and DHCP as defined
in section "Terminology" of RFC 3315.
3. Home Agent Option
The home agent option provides a list of one or more IPv6 addresses
of a mobile node's home agent. The home agent addresses are listed in
the order of preference for use by the mobile node.
The format of the home agent option is:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_HOMEAGENT | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| option-data:home-agent-address1 (IPv6 address) |
| or home-address |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| option-data:home-agent-address2 (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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option-code: OPTION_HOME_AGENT (TBD)
option-len: Length of the list of home agent addresses
in octets; must be a multiple of 16
option-data: IPv6 addresses of a mobile node's home
agents
4. Client behavior
In a message sent by a mobile node (client) to a server, the option-
len is set to 0 while the mobile node is on its home link. The
option-len is set to 16 while the mobile node is away from home, and
the option-data is set to the mobile node's home address.
When the mobile node(client) can acquire its home address or care-of
address through stateless auto-configuration, it SHOULD acquire its
home agent address using stateless DHCPv6.
5. Server behavior
Every home agent's address and preference are predefined on a DHCPv6
server. These home agents are classified by the link prefix, and are
listed in order of preference value if there is more than one home
agent on the same link.
The following describes the behavior of a DHCPv6 server that
implements the home agent option when the client's message includes
the home agent option.
If the client's option-len is 0, the link prefix is used as the key
for searching home agent lists. The DHCPv6 server SHOULD create the
association of the home address with its home agent addresses.
If the client's option-len is 16, the home address is used as the key
for searching the above-mentioned association.
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In a message sent by a server to a mobile node (client), the option-
data contains a list of IPv6 addresses which can serve as the home
agent for the mobile node.
Stateless DHCPv6 behavior will be specified in future.
6. Relay agent behavior
A relay agent forwards messages containing the home agent option
in the same way as described in section 20, "Relay Agent Behavior" of
RFC 3315.
7. IANA Considerations
IANA is requested to assign a DHCPv6 option code for the home agent
option.
8. Security Considerations
Section 23 of [RFC 3315] outlines the DHCPv6 security considerations.
This option does not change the security of DHCPv6 in any significant
way.
9. Acknowledgments
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10. References
10.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C. and M.
Carney, "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)",RFC3315,July 2003.
[3] Johnson, D., Perkins, C. and J. Arkko, "Mobility Support in
IPv6", RFC3775, June 2004.
10.2. Informative References
[4] T. Chown, S. Venaas, A. Vijayabhaskar "Renumbering Requirements
for Stateless DHCPv6", Work in Progress, May 2005
Author's Addresses
Ma Yuzhi
Huawei Bld., No.3 Xinxi Rd.,
Shang Di Information Industry Base,
Hai-Dian District Beijing P.R.China
Email: myz@huawei.com
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