Network Working Group J. Korhonen Request for Comments: 5149 U. Nilsson Category: Informational TeliaSonera V. Devarapalli Azaire February 2008 Service Selection for Mobile IPv6 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.
AbstractIn some Mobile IPv6 deployments, identifying the mobile node or the mobility service subscriber is not enough to distinguish between multiple services possibly provisioned to the said mobile node and its mobility service subscription. A capability to specify different services in addition to the mobile node identity can be leveraged to provide flexibility for mobility service providers on provisioning multiple services to one mobility service subscription. This document describes a Service Selection Mobility Option for both conventional Mobile IPv6 and Proxy Mobile IPv6 that is intended to assist home agents to make a specific service selection for the mobility service subscription during the binding registration procedure. 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Service Selection Mobility Option . . . . . . . . . . . . . . . 3 4. Processing Considerations . . . . . . . . . . . . . . . . . . . 4 4.1. Mobile Node Considerations . . . . . . . . . . . . . . . . 4 4.2. Home Agent Considerations . . . . . . . . . . . . . . . . . 5 4.3. Correspondent Node Considerations . . . . . . . . . . . . . 5 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 6 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.1. Normative References . . . . . . . . . . . . . . . . . . . 6 8.2. Informative References . . . . . . . . . . . . . . . . . . 7
2] can identify mobile nodes in various ways, including home addresses , Network Access Identifiers (NAIs) , and credentials suitable for the Internet Key Exchange Protocol version 2 (IKEv2) . In some Mobile IPv6 deployments, identifying the mobile node or the mobility service subscriber via a Proxy Mobile IPv6 client  (hereafter, the mobile node and the Proxy Mobile IPv6 client are used interchangeably) is not enough to distinguish between multiple services possibly provisioned to the said mobile node and its mobility service subscription. The capability to specify different services in addition to the mobile node identity can be leveraged to provide flexibility for mobility service providers to provide multiple services within the same mobility service subscription. For example: o Provide an enterprise data access for which the mobility service provider hosts connectivity and mobility services on behalf of the enterprise. o Provide access to service domains that are otherwise not accessible from public networks because of some mobility service provider's business reasons. o Provide simultaneous access to different service domains that are separated based on policies of the mobility service provider. o Enable easier policy and quality of service assignment for mobility service providers based on the subscribed services. o In the absence of a specifically indicated service, the home agent MUST act as if the default service, plain Internet access, had been requested. There is no absolute requirement that this default service be allowed to all subscribers, but it is highly RECOMMENDED in order to avoid having normal subscribers employ operator-specific configuration values in order to get basic service. This document describes a Service Selection Mobility Option for Mobile IPv6 that is intended to assist home agents to make specific service selections for the mobility service subscription during the binding registration procedure. The service selection may affect home agent routing decisions, Home Address or Home Network Prefix assignment policies, firewall settings, and security policies. The Service Selection option should be used in every Binding Update that makes a new registration to the home agent.
Some of the potential use-cases were listed earlier in this section. The general aim is better manageability of services and service provisioning from the point of view of both operators and service providers. However, it should be understood that there are potential deployment possibilities where selecting a certain service may restrict simultaneous access to other services from a user's point of view. For example, services may be located in different administrative domains or external customer networks that practice excessive filtering of inbound and outbound traffic. 1]. 2]) or authentication related options (such as the Mobility Message Authentication option ), then the Service Selection option MUST appear before any mobility message authorization- or authentication-related options. The Service Selection option SHOULD NOT be sent to a correspondent node. The mobile node cannot assume that the correspondent node has any knowledge about a specific service selection made between the mobile node and the home agent. The Service Selection option has no alignment requirement as such. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type = 20 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Identifier... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Service Selection Mobility Option
o Type: 8-bit identifier set to 20 of the type of the skipable mobility option. o Length: 8-bit unsigned integer, representing the length of the Service Selection Mobility Option in octets, excluding the Option Type and Option Length fields. A value of zero (0) is not allowed. o Identifier: A variable-length encoded service identifier string used to identify the requested service. The identifier string length is between 1 and 255 octets. This specification allows international identifier strings that are based on the use of Unicode characters, encoded as UTF-8 , and formatted using Normalization Form KC (NFKC) as specified in . 'ims', 'voip', and 'voip.companyxyz.example.com' are valid examples of Service Selection option Identifiers. At minimum, the Identifier MUST be unique among the home agents to which the mobile node is authorized to register.
delete the existing binding. If there is no existing binding, the mobile node proceeds as with any failed initial binding registration.
There are deployment cases where the home agent and a correspondent node, for example, belong to the same administrative domain. In this case, it is possible that the correspondent node shares the same knowledge of the services as the home agent. Therefore, the correspondent node is, for example, able to provide service-based traffic handling to mobile nodes. 9] in transport mode with a non-null encryption transform to provide message confidentiality. Section 3: Service Selection Mobility Option is set to 20 A new Mobile IPv6 registration denied by home agent Status Code has been assigned. The Status Code was allocated from the range 128-255: SERVICE_AUTHORIZATION_FAILED is set to 151  Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.  Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in IPv6", RFC 3775, June 2004.  Yergeau, F., "UTF-8, a transformation format of ISO 10646", STD 63, RFC 3629, November 2003.
 Davis, M. and M. Duerst, "Unicode Standard Annex #15; Unicode Normalization Forms", Unicode 5.0.0, October 2006.  Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K., and B. Patil, "Proxy Mobile IPv6", Work in Progress, December 2007.  Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The Network Access Identifier", RFC 4282, December 2005.  Patel, A., Leung, K., Khalil, M., Akhtar, H., and K. Chowdhury, "Mobile Node Identifier Option for Mobile IPv6 (MIPv6)", RFC 4283, November 2005.  Patel, A., Leung, K., Khalil, M., Akhtar, H., and K. Chowdhury, "Authentication Protocol for Mobile IPv6", RFC 4285, January 2006.  Kent, S., "IP Encapsulating Security Payload (ESP)", RFC 4303, December 2005.  Devarapalli, V. and F. Dupont, "Mobile IPv6 Operation with IKEv2 and the Revised IPsec Architecture", RFC 4877, April 2007.
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