DMM Working Group Zhiwei Yan
Internet Draft CNNIC
Expires: July 2015 Jong-Hyouk Lee
Sangmyung University
Xiaodong Lee
CNNIC
January 9, 2015
Home Network Prefix Renumbering in PMIPv6
draft-yan-dmm-hnprenum-00.txt
Abstract
In the basic Proxy Mobile IPv6 (PMIPv6) specification, a Mobile Node
(MN) is assigned a 64-bit Home Network Prefix (HNP) during the
initial attachment for the Home Address (HoA) configuration. During
the movement of the MN, this prefix is unchanged and unnecessary for
the MN to reconfigure the HoA. However, the current protocol does
not specify related operations to support the MN to timely receive
and configure a new HNP when the allocated HNP changes. In this
draft, this problem is discussed and a possible solution is proposed
based on RFC 7077.
Requirements Language
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 [RFC2119].
Status of this Memo
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This Internet-Draft will expire on July, 2015.
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Table of Contents
1. Introduction ................................................ 2
2. HNP renumbering support...................................... 3
3. DNS update .................................................. 4
4. Security Considerations...................................... 4
5. References .................................................. 4
Authors' Addresses ............................................. 5
Acknowledgment ................................................. 5
1. Introduction
Network managers currently prefer to Provider Independent (PI)
addressing for IPv6 to attempt to minimize the need for future
renumbering. However, widespread use of PI may create very serious
BGP scaling problems. It is thus desirable to develop tools and
practices that may make renumbering a simpler process to reduce
demand for IPv6 PI space [1]. In this draft, we aims to solve the
HNP renumbering problem when the HNP in PMIPv6 [2] is not a PI type.
Then the HNP renumbering may happen at least in the following three
cases:
In the first case, the PMIPv6 service provider is assigned the HNP
set from the (uplink) ISP, and then the HNP renumbering will happen
if the PMIPv6 service provider switches to a different ISP.
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In the second case, multiple Local Mobility Anchors (LMAs) may be
deployed by the same PMIPv6 service provider, and then each LMA may
serve for a specific HNP set. In this case, the HNP of a MN may
change if the current serving LMA switches to another LMA but
without inheriting the assigned HNP [3].
In the last case, the PMIPv6 HNP renumbering may be caused by the
re-building of the network architecture as the companies split,
merge, grow, relocate or reorganize. For example, the PMIPv6 service
provider may reorganize its network topology.
For the Mobile IPv6 (MIPv6), when the home network prefix changes
(maybe due to the above reasons), the Home Agent (HA) will actively
notify the new prefix to the MN and then the renumbering of the HoA
can be well supported [4]. While in the basic PMIPv6, the PMIPv6
binding is triggered by the Mobile Access Gateway (MAG), which
detects the attachment of the MN. When the HNP renumbering happens
in the first case or the LMA and HNP both changes in the second or
third cases, a scheme is needed for the LMA to immediately initiate
the PMIPv6 binding state refreshment. Although this issue is also
discussed in the RFC 5213 (section 6.12), the related solution is
not specified.
2. HNP renumbering support
RFC 7077 [5] specifies a scheme to support the asynchronously update
from the LMA to the MAG about changes related to a mobility session.
With this protocol, the HNP renumbering can be easily supported and
the basic operation is summarized as following:
1) When the PMIPv6 service provider renumbers the HNP set or the
serving LMA switches to another one but does not inherit the related
HNP, the current LMA (or new LMA) will initiate the HNP renumbering
operation. Firstly, it should allocate a new HNP for the related MN.
2) The LMA sends the Update Notification (UPN) message to the MAG.
In the UPN message, the Notification reason is set to 2 (UPDATE-
SESSION-PARAMETERS). Besides, HNP option containing the new HNP and
the Mobile Node Identifier option carrying MN'ID are contained as
Mobility Options of UPN.
3) After the MAG receives this UPN message, it will recognize that
the related MN has a new HNP now. Then the MAG sends the old HNP in
the RA with zero-valued lifetime to the MN and sends the new HNP in
the RA with lifetime larger than zero.
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4) Besides, the MAG sends back the Update Notification
Acknowledgement (UNA) to the LMA for the notification of successful
update of the related binding state, routing state and RA settings.
5) For the MN, it deletes the old HoA due to the zero-valued
lifetime RA advertisement and configures a new HoA with the
meaningful HNP.
The detailed protocol operation and signaling message extensions
will be specified further.
3. DNS update
In order to maintain the reachability of the MN, the DNS resource
record corresponding to this MN may need to be updated when the HNP
of MN changes. Although this operation in PMIPv6 has not been
specified by the current protocols, we here list two important
issues to be considered for this operation.
1) Since the DNS update must be performed securely in order to
prevent attacks or modifications from malicious ones, the node
performing this update must share a security association with the
DNS server [6]. If the MN does not share a security association with
the DNS server and the DNS entry update can be performed by the
network entities, such as Authentication, Authorization and
Accounting (AAA) server or LMA.
2) For the dynamic update, another important issue should be
considered is the TTL setting when the HNP renumbering is possible.
The TTL should be set according to the possible lifetime of the HNP.
4. Security Considerations
The security considerations in PMIPv6 protocol are enough for the
basic operation of this draft.
Besides, the security dynamic DNS should be supported whatever the
DNS update is executed by network entities or MN itself. In other
words, the security association should always be established between
the DNS server and updater.
Other security issues will be added further.
5. References
[1] S. Jiang, B. Liu, and B. Carpenter, "IPv6 Enterprise Network
Renumbering Scenarios and Guidelines", RFC 6879, February 2013.
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[2] S. Gundavelli, K. Leung, V. Devarapalli, K. Chowdhury, and B.
Patil, "Proxy Mobile IPv6", RFC 5213, August 2008.
[3] J. Korhonen, S. Gundavelli, H. Yokota, and X. Cui, "Runtime
Local Mobility Anchor (LMA) Assignment Support for Proxy
Mobile IPv6", RFC 6463, February 2012.
[4] C. Perkins, D. Johnson, and J. Arkko, "Mobility Support in
IPv6", RFC 6275, July 2011.
[5] S. Krishnan, S. Gundavelli, M. Liebsch, H. Yokota and J.
Korhonen, "Update Notifications for Proxy Mobile IPv6", RFC
7077, November 2013.
[6] Wellington, B., "Secure Domain Name System (DNS) Dynamic
Update", RFC 3007, November 2000.
Authors' Addresses
Zhiwei Yan
China Internet Network Information Center
No.4 South 4th Street, Zhongguancun
Beijing, P. R. China
Email: yan@cnnic.cn
Jong-Hyouk Lee
Department of Computer Science and Engineering
Sangmyung University
31, Sangmyeongdae-gil, Dongnam-gu
Cheonan, Republic of Korea
E-mail: jonghyouk@smu.ac.kr
Xiaodong Lee
China Internet Network Information Center
No.4 South 4th Street, Zhongguancun
Beijing, P. R. China
Email: xl@cnnic.cn
Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
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