One document matched: draft-xia-mext-hioptv4-02.txt
Differences from draft-xia-mext-hioptv4-01.txt
Network Working Group F. Xia
Internet-Draft B. Sarikaya
Expires: October 28, 2011 Huawei USA
April 26, 2011
DHCPv4 Options for Home Information Discovery in Dual Stack MIPv6
draft-xia-mext-hioptv4-02.txt
Abstract
This document defines DHCPv4 options for dynamic discovery of home
network information in Dual Stack Mobile IPv6. New DHCPv4 options
are defined which allow a mobile node to request the home agent
IPv4/v6 address, FQDN, or home network prefix and obtain it via the
DHCPv4 response.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 28, 2011.
Copyright Notice
Copyright (c) 2011 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Home Information Discovery Using DHCPv6 . . . . . . . . . . . . 3
4. DHCPv4 options for HA Dynamic Discovery . . . . . . . . . . . . 4
4.1. Home Network Information Option . . . . . . . . . . . . . . 4
4.2. DSMIPv6 Relay Agent Option . . . . . . . . . . . . . . . . 5
5. Appearance of these options . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
7. IANA considerations . . . . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1. Normative References . . . . . . . . . . . . . . . . . . . 7
9.2. Informative References . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
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1. Introduction
Before a mobile node can exchange Mobile IPv6 signaling with a home
agent, it should either know the IP address of the home agent via
pre-configuration, or dynamically discover it. New DHCPv6 options
are defined in [I-D.ietf-mip6-hiopt] which allow a mobile node to
request the home agent IPv6 address, FQDN, or home network prefix and
obtain it via the DHCP response.
[I-D.ietf-mext-nemo-v4traversal](DSMIPv6) extends mobile IPv6
specification [RFC3775] to allow the registration of IPv4 addresses,
and the transport of packets over IPv4 tunnels between mobile nodes
and home agents. With home agent discovery in DSMIPv6, there are
actually four different cases:
o Discovering HA's IPv6 address with DHCPv6
o Discovering HA's IPv4 address with DHCPv6
o Discovering HA's IPv4 address with DHCPv4
o Discovering HA's IPv6 address with DHCPv4
The first two cases are dealt with in [I-D.ietf-mip6-hiopt], while
the last two cases are specified in this document. DHCPv4 options
are defined based on DHCPv4 protocol specified in [RFC2131].
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 [RFC2119]. The
terminology in this document is based on the definitions in
[I-D.ietf-mip6-hiopt]
3. Home Information Discovery Using DHCPv6
[I-D.ietf-mip6-hiopt] introduces the following DHCPv6 options and
their sub-options which are used for dynamic discovery of the home
agent's IPv4/IPv6 address, IPv6 home network prefix, or FQDN
information in DSMIPv6.
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Home Network Information Option
This option allows the exchange of home network information
between the mobile node (DHCPv6 client) and the DHCPv6 server. It
is used to indicate the target home network requested by the
mobile node to the DHCPv6 server. It also conveys the home
network information assigned by the DHCPv6 server to the mobile
node as a response.
MIP6 Relay Agent Option
This option carries the home network information for the mobile
node from the DHCPv6 relay agent to the DHCPv6 server. For
instance, the NAS is collocated with the DHCPv6 relay agent, and
the NAS gets the home network information from external AAA
servers. This option is added to the DHCPv6 message when the NAS/
DHCP relay agent relays DHCPv6 request message from the mobile
node to the DHCPv6 server, the option is added to the relayed
message. Being populated with this information, the DHCPv6 server
uses Home Network Information Option to reply the mobile node.
Common Sub-options
This sub-option is a container for a home network parameter in the
Home Network Information option or in the MIP6 Relay Agent option.
In this document, Home Network Information Option Section 4.1 DSMIPv6
Relay Agent Option Section 4.2 for DHCPv4 are defined to take the
place of Home Network Information Option and MIP6 Relay Agent Option
respectively. The difference between these options and their
replacements is only on format, that is, these options are for DHCPv6
while their replacements are for DHCPv4. Common Sub-options in
[I-D.ietf-mip6-hiopt] are reused in this document.
4. DHCPv4 options for HA Dynamic Discovery
4.1. Home Network Information Option
The option allows the exchange of home network information between
the mobile node (DHCPv4 client) and the DHCPv4 server. It is used to
indicate the target home network requested by the mobile node to the
DHCPv4 server. It also conveys the home network information assigned
by the DHCPv4 server to the mobile node as a response.
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0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-code | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Id-type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sub-options |
| ... ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Option-code
OPTION_DSMIP6_HNINF (TDB)
Option-len
Length of the 'options' field in octets;
MUST be a multiple of four (4).
Id-type
The type of Home Network Information.
0 Visited domain (local ASP)
1 Target MSP
2 No preference by the mobile node
Sub-options
A series of sub-options as specified in [I-D.ietf-mip6-hiopt].
4.2. DSMIPv6 Relay Agent Option
As a replacement of MIP6 Relay Agent Option in [I-D.ietf-mip6-hiopt],
this option carries the home network information for the mobile node
from the DHCPv4 relay agent to the DHCPv4 server.
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0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-code | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sub-options |
| ... ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Option-code
OPTION_DSMIP6_RELAY (TBD)
Option-len
Length of the 'options' field in octets;
MUST be a multiple of four (4).
Sub-options
A series of sub-options as specified in
[I-D.ietf-mip6-hiopt].
5. Appearance of these options
The Home Network Information Option MUST NOT appear in any message
other than the following messages: DHCPDISCOVER, DHCPOFFER,
DHCPREQUEST, DHCPACK,DHCPINFORM.
The DSMIPv6 Relay Agent Option MUST NOT appear in any message other
than the following messages: DHCPDISCOVER, DHCPREQUEST, DHCPINFORM.
6. Security Considerations
The security considerations in [RFC2131] and [RFC2132]apply. Special
considerations in [I-D.ietf-mip6-hiopt] are also applicable.
7. IANA considerations
IANA is requested to assign the OPTION_DSMIP6_HNINF and
OPTION_DSMIP6_RELAY Option Codes in the registry maintained in
http://www.iana.org/assignments/dhcpv6-parameters.
8. Acknowledgements
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9. References
9.1. Normative References
[RFC1981] McCann, J., Deering, S., and J. Mogul, "Path MTU Discovery
for IP version 6", RFC 1981, August 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3775] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support
in IPv6", RFC 3775, June 2004.
[RFC2131] Droms, R., "Dynamic Host Configuration Protocol",
RFC 2131, March 1997.
[RFC2132] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor
Extensions", RFC 2132, March 1997.
[IANAADFAM]
"IANA",
<http://www.iana.org/assignments/address-family-numbers>.
9.2. Informative References
[I-D.ietf-mip6-hiopt]
Jang, H., Yegin, A., Chowdhury, K., and J. Choi, "DHCP
Options for Home Information Discovery in MIPv6",
draft-ietf-mip6-hiopt-17 (work in progress), May 2008.
[I-D.ietf-mext-nemo-v4traversal]
Soliman, H., "Mobile IPv6 Support for Dual Stack Hosts and
Routers", draft-ietf-mext-nemo-v4traversal-10 (work in
progress), April 2009.
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Authors' Addresses
Frank Xia
Huawei USA
1700 Alma Dr. Suite 500
Plano, TX 75075
Phone: +1 972-509-5599
Email: xiayangsong@huawei.com
Behcet Sarikaya
Huawei USA
5340 Legacy Dr. Suite 175
Plano, TX 75074
Phone:
Email: sarikaya@ieee.org
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