[Docs] [txt|pdf] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits]
Versions: 00 01 02 03 RFC 4283
Network Working Group A. Patel
Internet-Draft K. Leung
Expires: June 21, 2005 Cisco Systems
M. Khalil
H. Akhtar
Nortel Networks
K. Chowdhury
Starent Networks
December 21, 2004
Mobile Node Identifier Option for Mobile IPv6
draft-ietf-mip6-mn-ident-option-01.txt
Status of this Memo
By submitting this Internet-Draft, I certify that any applicable
patent or other IPR claims of which I am aware have been disclosed,
and any of which I become aware will be disclosed, in accordance with
RFC 3668.
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 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."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on June 21, 2005.
Copyright Notice
Copyright (C) The Internet Society (2004). All Rights Reserved.
Abstract
This document defines new mobility option to identify mobility
entities using identifiers other than the home IP address. This
option can be used in messages containing a mobility header.
Patel, et al. Expires June 21, 2005 [Page 1]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Mobile Node Identifier option . . . . . . . . . . . . . . . . 5
3.1 MN-NAI mobility option . . . . . . . . . . . . . . . . . . 5
3.2 Processing Considerations . . . . . . . . . . . . . . . . 6
4. Security Considerations . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9
7. Normative References . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 9
Intellectual Property and Copyright Statements . . . . . . . . 11
Patel, et al. Expires June 21, 2005 [Page 2]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
1. Introduction
The base specification of Mobile IPv6 [RFC3775] identifies mobility
entities using an IPv6 address. A mechanism is needed where in
mobility entities can be identified using other identifiers (for
example, a network access identifier (NAI) [RFC_2486bis],
International Mobile Station Identifier (IMSI), an application/
deployment specific opaque identifier etc). Using other identities
for a mobile node (MN) permits various applicabilities, e.g.
authentication using existing infrastructure (AAA (Authentication,
Authorization and Accounting), HLR/AuC (Home Location Register/
Authentication Center)), dynamic allocation of a mobility anchor
point, dynamic allocation of an address etc.
This document defines an option with subtype number which identify a
specific type of identifier. One instance of subtype, the NAI is
defined in Section 3.1. It is expected that other types of
identifiers will be defined by other documents in the future.
Patel, et al. Expires June 21, 2005 [Page 3]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
2. Terminology
The keywords "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.
Patel, et al. Expires June 21, 2005 [Page 4]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
3. Mobile Node Identifier option
This section defines the Mobile Node Identifier option. Various
forms of identifiers can be used to identify a MN. Some examples
include a Network Access Identifier (NAI) [RFC_2486bis], an opaque
identifier applicable to a particular application, etc. The sub-type
field in the option defines the specific type of identifier.
This option can be used in mobility messages containing a mobility
header. The subtype field in the option is used to interpret the
specific type of identifier.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Option Type | Option Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Subtype | Identifier ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Option Type:
MN-ID-OPTION-TYPE to be defined by IANA. An 8-bit identifier
of the type mobility option.
Option Length:
8-bit unsigned integer, representing the length in octets of
the Subtype and Identifier fields.
Subtype:
Subtype field defines the specific type of identifier included
in the identifier field.
Identifier:
A variable length identifier of type as specified by the
subtype field of this option.
This option does not have any alignment requirements.
3.1 MN-NAI mobility option
The format of the MN-NAI mobility option is as defined in Section 3.
This option uses the subtype value of 1. The MN-NAI mobility option
Patel, et al. Expires June 21, 2005 [Page 5]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
is used to identify the mobile node.
The MN-NAI mobility option uses an identifier of the form user@realm
[RFC_2486bis].
3.2 Processing Considerations
When present, this option MUST appear before any authentication
related option in a message containing a mobility header.
Patel, et al. Expires June 21, 2005 [Page 6]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
4. Security Considerations
Mobile IPv6 already contains one mechanism for identifying mobile
nodes, the Home Address Option [RFC 3775]. As a result, the
vulnerabilities of the new option defined in this document are
similar to those that already exist for Mobile IPv6. In particular,
the use of a permanent, stable identifier may compromise the privacy
of the user, making it possible to track a particular device or user
as it moves through different locations.
In addition, since an NAI reveals the home affiliation of a user, it
may assist an attacker in determining the identity of the user, help
the attacker in targeting specific victims, or assist in further
probing of the username space.
These vulnerabilities can be addressed through various mechanisms,
such as those discussed below:
o Encrypting traffic at link layer such that other users on the same
link do not see the identifiers. This mechanism does not help
against attackers on the rest of the path between the mobile node
and its home agent.
o Encrypting the whole packet, such as when using IPsec to protect
the communications with the home agent [RFC 3776].
o Using an authentication mechanism that enables the use of privacy
NAIs [RFC_2486bis] or temporary, changing "pseudonyms" as
identifiers.
In any case, it should be noted that as the identifier option is only
needed on the first registration at the home agent and subsequent
registrations can use the home address, the window of privacy
vulnerability in this document is reduced as compared to the RFC
3775. In addition, this document is a part of a solution to allow
dynamic home addresses to be used. This is an improvement to privacy
as well, and affects both communications with the home agent and the
correspondent nodes, both of which have to be told the home address.
Patel, et al. Expires June 21, 2005 [Page 7]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
5. IANA Considerations
IANA services are required for this document. The values for new
mobility options must be assigned from the Mobile IPv6 [RFC3775]
numbering space.
The values for Mobility Option types MN-ID-OPTION-TYPE as defined in
Section 3 need to be assigned. The suggested value is 7 for the
MN-ID-OPTION-TYPE.
IANA should record a value for this new mobility option.
In addition, the IANA needs to create a new namespace for the subtype
field of the Mobile Node Identifier Option. The currently allocated
values are as follows:
NAI (defined in this document) [1]
New values for this namespace can be allocated using Standards Action
[RFC 2434].
Patel, et al. Expires June 21, 2005 [Page 8]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
6. Acknowledgements
The authors would like to thank Basavaraj Patil for his review and
suggestions on this draft. Thanks to Jari Arkko for review and
suggestions regarding security considerations and various other
aspects of the document.
7 Normative References
[RFC3775] Johnson, D., Perkins, C. and J. Arkko, "Mobility Support
in IPv6", RFC 3775, June 2004.
[RFC_2486bis]
Aboba, et. al., B., "The Network Access Identifier",
draft-ietf-radext-rfc2486bis-03.txt (work in progress),
November 2004.
Authors' Addresses
Alpesh Patel
Cisco Systems
170 W. Tasman Drive
San Jose, CA 95134
US
Phone: +1 408-853-9580
EMail: alpesh@cisco.com
Kent Leung
Cisco Systems
170 W. Tasman Drive
San Jose, CA 95134
US
Phone: +1 408-526-5030
EMail: kleung@cisco.com
Mohamed Khalil
Nortel Networks
2221 Lakeside Blvd.
Richardson, TX 75082
US
Phone: +1 972-685-0574
EMail: mkhalil@nortelnetworks.com
Patel, et al. Expires June 21, 2005 [Page 9]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
Haseeb Akhtar
Nortel Networks
2221 Lakeside Blvd.
Richardson, TX 75082
US
Phone: +1 972-684-4732
EMail: haseebak@nortelnetworks.com
Kuntal Chowdhury
Starent Networks
2540 Coolwater Dr.
Plano, TX 75025
US
Phone: +1 214 550 1416
EMail: kchowdury@starentnetworks.com
Patel, et al. Expires June 21, 2005 [Page 10]
Internet-Draft Mobile Node Identifier Option for Mobile IPv6
December 2004
Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at
ietf-ipr@ietf.org.
Disclaimer of Validity
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Copyright Statement
Copyright (C) The Internet Society (2004). This document is subject
to the rights, licenses and restrictions contained in BCP 78, and
except as set forth therein, the authors retain all their rights.
Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
Patel, et al. Expires June 21, 2005 [Page 11]
Html markup produced by rfcmarkup 1.129d, available from
https://tools.ietf.org/tools/rfcmarkup/