Network Working Group K. Nagami
Request for Comments: 4908 INTEC NetCore
Category: Experimental S. Uda
JAIST
N. Ogashiwa
NOWARE, Inc.
H. Esaki
University of Tokyo
R. Wakikawa
Keio University
H. Ohnishi
NTT
June 2007
Multihoming for Small-Scale Fixed Networks
Using Mobile IP and Network Mobility (NEMO)
Status of This Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The IETF Trust (2007).
IETF 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.
Nagami, et al. Experimental [Page 1]RFC 4908 Multihoming for Fixed Network June 2007Abstract
Multihoming technology improves the availability of host and network
connectivity. Since the behaviors of fixed and mobile networks
differ, distinct architectures for each have been discussed and
proposed. This document proposes a common architecture for both
mobile and fixed networking environments, using mobile IP (RFC 3775)
and Network Mobility (NEMO; RFC 3963). The proposed architecture
requires a modification of mobile IP and NEMO so that multiple Care-
of Addresses (CoAs) can be used. In addition, multiple Home Agents
(HAs) that are located in different places are required for
redundancy.
1. Motivation
Users of small-scale networks need an easy method to improve network
availability and to load balance several links. Multihoming
technology is one of the solutions to improve availability.
Conventional major multihoming networks use BGP, but it has some
issues. Therefore, we propose a multihoming architecture using
mobile IP [1] and NEMO [2] for small-scale fixed networks.
1.1. General Benefits of Multihoming
In a multihoming network environment, both users and network managers
benefit from controlling outgoing traffic, incoming traffic, or both
of them. Those benefits are described in "Goals and Benefits of
Multihoming" [3]. The following is a summary of those goals and
benefits:
o Ubiquitous Access
o Redundancy/Fault-Recovery
o Load Sharing
o Load Balancing
o Bi-casting
o Preference Settings
1.2. Problems to be Solved to Accomplish Multihoming
Several multihoming technologies have been proposed so far.
Conventional major multihoming networks use BGP, but it has some
issues, as follows.
Nagami, et al. Experimental [Page 2]RFC 4908 Multihoming for Fixed Network June 2007
(1) Increasing route entries in the Internet
In the multihoming environments, each user's network needs to
advertise its address block to all ISPs connected to them. If a
multihomed user connects to only one ISP, the ISP can advertise
routing information to aggregate them. But some multihomed users
need to connect with different ISPs to be prepared for ISP
failure. In this case, ISPs need to advertise routing information
for multihomed users without aggregation. Therefore, the number
of routing entries in the Internet is increasing one by one.
(2) Difficulty of using multiple links efficiently
It is not easy to control incoming traffic in the case of the
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