Network Working Group K. Leung
Request for Comments: 5177 G. Dommety
Category: Standards Track Cisco Systems
V. Narayanan
Qualcomm, Inc.
A. Petrescu
Motorola
April 2008
Network Mobility (NEMO) Extensions for Mobile IPv4
Status of This Memo
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 of this memo is unlimited.
Abstract
This document describes a protocol for supporting Mobile Networks
between a Mobile Router and a Home Agent by extending the Mobile IPv4
protocol. A Mobile Router is responsible for the mobility of one or
more network segments or subnets moving together. The Mobile Router
hides its mobility from the nodes on the Mobile Network. The nodes
on the Mobile Network may be fixed in relationship to the Mobile
Router and may not have any mobility function.
Extensions to Mobile IPv4 are introduced to support Mobile Networks.
Leung, et al. Standards Track [Page 1]
RFC 5177 Mobile Router April 2008
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Examples of Mobile Networks . . . . . . . . . . . . . . . 3
1.2. Overview of Protocol . . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Mobile Network Extensions . . . . . . . . . . . . . . . . . . 8
4.1. Mobile Network Request Extension . . . . . . . . . . . . . 8
4.2. Mobile Network Acknowledgement Extension . . . . . . . . . 9
5. Mobile Router Operation . . . . . . . . . . . . . . . . . . . 11
5.1. Error Processing . . . . . . . . . . . . . . . . . . . . . 12
5.2. Mobile Router Management . . . . . . . . . . . . . . . . . 12
6. Home Agent Operation . . . . . . . . . . . . . . . . . . . . . 13
6.1. Summary . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2. Data Structures . . . . . . . . . . . . . . . . . . . . . 14
6.2.1. Registration Table . . . . . . . . . . . . . . . . . . 14
6.2.2. Prefix Table . . . . . . . . . . . . . . . . . . . . . 14
6.3. Mobile Network Prefix Registration . . . . . . . . . . . . 14
6.4. Advertising Mobile Network Reachability . . . . . . . . . 16
6.5. Establishment of Bi-directional Tunnel . . . . . . . . . . 16
6.6. Sending Registration Replies . . . . . . . . . . . . . . . 17
6.7. Mobile Network Prefix Deregistration . . . . . . . . . . . 17
7. Data Forwarding Operation . . . . . . . . . . . . . . . . . . 17
8. Nested Mobile Networks . . . . . . . . . . . . . . . . . . . . 18
9. Routing Protocol between Mobile Router and Home Agent . . . . 18
10. Security Considerations . . . . . . . . . . . . . . . . . . . 19
10.1. Security when Dynamic Routing Protocol Is Used . . . . . . 20
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 22
13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13.1. Normative References . . . . . . . . . . . . . . . . . . . 23
13.2. Informative References . . . . . . . . . . . . . . . . . . 24
Leung, et al. Standards Track [Page 2]
RFC 5177 Mobile Router April 2008
1. Introduction
This document describes network mobility extensions to the Mobile
IPv4 protocol. The goal of introducing these extensions is to
accommodate mobility scenarios where groups of hosts and routers move
homogeneously (as a whole). It is required that all hosts and
routers in a Mobile Network be able to run applications connecting to
the Internet, and be reachable from the Internet.
For details regarding terminology related to network mobility (NEMO),
a quick read of RFC 4885 [RFC4885] is suggested.
1.1. Examples of Mobile Networks
A Mobile Network links together a set of hosts and routers.
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