Cisco's Mobile IPv4 Host Configuration Extensions
RFC 4332
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RFC - Informational
(December 2005; No errata)
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Last updated |
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2015-10-14
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ISE
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plain text
pdf
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bibtex
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ISE state
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(None)
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Consensus Boilerplate |
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Unknown
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No shepherd assigned
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IESG state |
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RFC 4332 (Informational)
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Telechat date |
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Responsible AD |
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Margaret Cullen
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Network Working Group K. Leung
Request for Comments: 4332 A. Patel
Category: Informational Cisco Systems
G. Tsirtsis
Flarion Technologies
E. Klovning
Birdstep Technology ASA
December 2005
Cisco's Mobile IPv4 Host Configuration Extensions
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
IESG Note
This RFC is not a candidate for any level of Internet Standard. The
IETF disclaims any knowledge of the fitness of this RFC for any
purpose and in particular notes that the decision to publish is not
based on IETF review for such things as security, congestion control,
or inappropriate interaction with deployed protocols. The RFC Editor
has chosen to publish this document at its discretion. Readers of
this document should exercise caution in evaluating its value for
implementation and deployment. See RFC 3932 for more information.
This RFC does not offer any security mechanisms to provide data
origin authentication and integrity, yet these security services are
vitally important in this context.
Abstract
An IP device requires basic host configuration to be able to
communicate. For example, it will typically require an IP address
and the address of a DNS server. This information is configured
statically or obtained dynamically using Dynamic Host Configuration
Protocol (DHCP) or Point-to-Point Protocol/IP Control Protocol
(PPP/IPCP). However, both DHCP and PPP/IPCP provide host
configuration based on the access network. In Mobile IPv4, the
registration process boots up a Mobile Node at an access network,
also known as a foreign network. The information to configure the
Leung, et al. Informational [Page 1]
RFC 4332 Host Config December 2005
host needs to be based on the home network. This document describes
the Cisco vendor-specific extensions to Mobile IPv4 to provide the
base host configuration in Registration Request and Reply messages.
Table of Contents
1. Introduction ....................................................2
2. Host Configuration Extensions Summary ...........................3
3. Host Configuration Extensions ...................................4
3.1. Host Configuration Request Extension .......................5
3.2. Home Network Length Prefix Extension .......................5
3.3. DNS Server Extension .......................................6
3.4. DHCP Server Extension ......................................6
3.5. DHCP Client ID Extension ...................................7
3.6. Default Gateway Extension ..................................7
3.7. DNS Suffix Extension .......................................8
3.8. Configuration URL Extension ................................8
4. Security Considerations .........................................9
5. Acknowledgements ................................................9
6. Informative References ..........................................9
1. Introduction
An IPv4 device requires some basic configuration to communicate with
other nodes. Typically, it has an IP address for an interface and
DNS server's IP address to resolve the peer's hostname to an IP
address. DHCP [RFC2131] and PPP/IPCP [RFC1332] provide host
configuration information on the access network interface, but this
is inadequate in a Mobile IPv4 environment. In Mobile IPv4
[RFC3344], a Mobile Node has a virtual network interface on the home
network, anchored by the Home Agent. The IP address, home subnet
prefix, default gateway, and home network's DNS servers are essential
in the boot up of a network interface. In some cases, these are the
only pieces of information needed by the Mobile Node.
The Mobile IPv4 registration process provides the mechanism for a
Mobile Node to boot up on a foreign network. Upon the successful
registration, the Mobile Node can communicate with the Correspondent
Node. The need to provide an efficient method to obtain the host
configuration exists. If the Mobile Node is a DHCP client, it can
obtain configuration parameters from the DHCP server in the home
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