Internet DRAFT - draft-bharatia-mobileip-gen-mipv4-ext
draft-bharatia-mobileip-gen-mipv4-ext
Mobile IP Working Group Jayshree Bharatia
Internet Draft Kuntal Chowdhury
Category: Standards Track Nortel Networks
Expires on December 2003 Avi Lior
<draft-bharatia-mobileip-gen-mipv4-ext-02.txt> Bridgewater
Systems
Lila Madour
Ericsson
June 2003
Mobile IPv4 Extension for Configuration Options Exchange
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas,
and its working groups. Note that other groups may also distribute
working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six
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The list of current Internet-Drafts can be accessed at
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Abstract
IP Mobility support for IPv4 [RFC3344] defines a short and skippable
extension header format intended to extend the Mobile IP extension
address space. Based on the format presented in [RFC3344], this
draft defines a Mobile IP extension for configuration options, which
SHOULD be used by any Mobile IP entity to exchange information of
the network entities like DNS server address, previous Foreign Agent
(FA) address etc.
1 Introduction
This draft uses short and skippable extension header format defined
by [RFC3344] and offers a generalized solution to exchange
information like address of DNS server, address of previous FA etc.
1.1 Glossary of Terms
FA Foreign Agent
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HA Home Agent
MN Mobile Node
DNS Domain Name Server
DHCP Dynamic Host Configuration Protocol
SIP Session Initiation Protocol
2 Conventions used in this document
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.
3 Mobile IP Extension for Configuration Options Exchange
The Mobile IP extension SHALL have the format shown in this section
to carry information like IPv4 address. Note that this extension MAY
be included as a part of Mobile IP Registration Request. If this
extension is requested in the Registration Request, the network
entity (mentioned in the Entity-Type field) SHOULD provide requested
information in the Registration Reply. If multiple Sub-Types are
needed in the same message, the configuration options header SHOULD
be repeated for each Sub-Type.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Entity-Type | Sub-Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data
+-+-+-+-+-+-...
Type
IPV4-CONF-OPTIONS-EXT-TYPE=TBD. This extension value will be
assigned by IANA from the numbering space defined in [RFC3344]
for skippable extensions.
Length
Represents 8-bit unsigned integer (in octets). Length of the
extension includes the extension type and the extension Length
fields. This field MUST be set to 1 plus the total length of the
Data and Entity-Type fields.
Sub-Type
This field describes the type of entity, whose information is
requested from the network entities (mentioned in Entity-Type
field) when used in a configuration options extension for
Registration Request. But it describes the type of entity, whose
information is included in Data field when used in a
configuration options extension for Registration Reply.
Currently the following types are defined:
PRIMARY-DNS-SERVER = TBD
SECONDARY-DNS-SERVER = TBD
PREVIOUS-FOREIGN-AGENT = TBD
PRIMARY-SIP-SERVER = TBD
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SECONDARY-SIP-SERVER = TBD
DHCP-SERVER = TBD
MULTIMEDIA-MESSAGING-SERVER = TBD
BROADCAST-MULTICAST-CONTROL-SERVER = TBD
Entity-Type
This field in a configuration options extension for Registration
Request includes the type of the network entity from whom the
information is requested. When this field is included in the
configuration options extension for Registration Reply, it
refers to the network entity that inserts the Data field.
Currently the following types are defined:
HOME-AGENT = TBD
FOREIGN-AGENT = TBD
Data
This field is inserted in a Registration Reply by the network
entity mentioned in the Entity-Type of the Registration Request.
This field represents the data of the network entity mentioned
in the Sub-Type.
4 Processing of Configuration Options Extension
When a network entity (mentioned in the extension format of the
Entity-Type) adds a configuration options extension to a
Registration Request or Registration Reply message, this extension
MUST appear prior to any authentication extensions added by that
entity.
5 IANA Considerations
This draft defines new Mobile IPv4 extension of types IPV4-CONF-
OPTIONS-EXT-TYPE as defined in section 3 of this document. This
value MUST be assigned by IANA from the Mobile IP numbering space
for skippable extensions. Additionally, unique values MUST be
assigned to each member of the Sub-Type and Entity-Type fields.
6 Security Considerations
There are no additional security aspects imposed by this document in
addition to the one defined in [RFC3344].
7 References
[RFC3344] "IP Mobility Support for IPv4", RFC3344
8 Acknowledgments
Authors like to thank Curtis Provost and Tom Hiller for their
valuable input to this document.
9 Author's Address
Jayshree Bharatia
Nortel Networks
2221, Lakeside Blvd,
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Richardson, TX-75082
Phone: +1 972-684-5767
jayshree@nortelnetworks.com
Kuntal Chowdhury
Nortel Networks
2221, Lakeside Blvd,
Richardson, TX-75082
Phone: +1 972-685-7788
chowdury@nortelnetworks.com
Avi Lior
Bridgewater Systems,
303 Terry Fox Drive, Suite 100
Ottawa, Ontario, Canada, K2K 3J1
Phone: +1 613-591-6655
avi@bridgewatersystems.com
Lila Madour
Ericsson Canada
8400 Decarie, TMR
Quebec, Canada
Phone: +1 514-345-7900
Lila.Madour@ericsson.ca
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