Distributed Mobility Managment Working Group D. Liu Internet-Draft H. Deng Updates: 5014 (if approved) China Mobile Intended status: Standards Track C. Perkins Expires: May 10, 2014 Futurewei November 06, 2013 Mobility API Extension for Distributed Mobility Management draft-liu-dmm-mobility-api-02 Abstract In order to provide an appropriate level of mobility support that a mobile node may require for proper performance of various applications, it is important to enable applications to select addresses that will be managed properly by the mobility management infrastructure. Previous documents have enabled address selection on the basis of certain characteristics such as randomness, temporary usage, scope of validity, and so on. This document proposes new classes of addresses in addition to those already available, to enable an application to receive certain kinds of mobility support. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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." This Internet-Draft will expire on May 10, 2014. Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of Liu, et al. Expires May 10, 2014 [Page 1]
Internet-Draft draft-liu-dmm-mobility-api-02 November 2013 publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Proposed Extension of RFC 5014 . . . . . . . . . . . . . . . 2 4. Usage Example . . . . . . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 6. Security Considerations . . . . . . . . . . . . . . . . . . . 4 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 8.1. Normative References . . . . . . . . . . . . . . . . . . 4 8.2. Informative References . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction An extension to the socket API (see [RFC5014]) has been specified to allow an application to identify its preference among multiple source addresses. Furthermore, there are proposals ([I-D.draft-korhonen-6man-prfix-properties] and [I-D.draft-bhandari-dhc-class-based-prefix-04]) to extend router advertisement to carry property and class information for the advertised prefixes. Those proposals enable a mobile node to learn the property and class information for the prefix from the router advertisement message. This document proposes an extension to [RFC5014] which would add more prefix classes so that an application could select prefixes with properties that are important for distributed mobility management. 2. Terminology 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 RFC 2119 [RFC2119]. 3. Proposed Extension of RFC 5014 Liu, et al. Expires May 10, 2014 [Page 2]
Internet-Draft draft-liu-dmm-mobility-api-02 November 2013 A socket API extension defined in [RFC5014] is used for IPv6 source address selection. An application can use this API to override the default source address selection mechanism for IPv6. Currently, the following types of source address selection preference are defined in [RFC5014]: IPV6_PREFER_SRC_HOME /* Prefer Home address as source */ IPV6_PREFER_SRC_COA /* Prefer Care-of address as source */ IPV6_PREFER_SRC_TMP /* Prefer Temporary address as source */ IPV6_PREFER_SRC_PUBLIC /* Prefer Public address as source */ IPV6_PREFER_SRC_CGA /* Prefer CGA address as source */ IPV6_PREFER_SRC_NONCGA /* Prefer a non-CGA address as source */ This document proposes the addition of two new flags: IPV6_PREFER_SRC_LOCAL_HNP /* Prefer a local home prefix */ IPV6_PREFER_SRC_REMOTE_HNP /* Prefer a remote home prefix */ The local home prefix may be preferred by applications which are likely to discontinue operations before the device travels to distant networks. On the other hand, a remote home prefix may be more suitable for continued operation over wide areas, but at potentially increased cost for mobiilty management. 4. Usage Example This section gives usage examples for the new flags API extension. Relevant distributed mobility management practices are discussed in [I-D.draft-ietf-dmm-best-practices-gap-analysis-01] and [I-D.draft-seite-dmm-dma-06]. The concept of dynamic anchoring concept is introduced, which means that the mobile node can have multiple mobility anchor points. Then, the mobile node can select a locally allocated IP address for newly launched applications for optimized routing. When the application continues communications while the mobile node moves to a new point of attachment, the mobile node can nevertheless stilluse the IP address allocated by previous anchor point for the on going communications. When the application terminates, the mobile node will release the IP address allocated by the previous anchor point. Liu, et al. Expires May 10, 2014 [Page 3]
Internet-Draft draft-liu-dmm-mobility-api-02 November 2013 In the dynamic anchoring scenario, the newly started application should use an IP address allocated by the local mobility anchor. The application can use IPV6_PREFER_SRC_LOCAL_HNP flag to select the local allocated IP address. For more long-lived communications, the application can use IPV6_PREFER_SRC_REMOTE_HNP flag to select the home address allocated by the previous mobility anchor to enable session continuity. 5. IANA Considerations This document makes no request of IANA. Note to RFC Editor: this section may be removed on publication as an RFC. 6. Security Considerations TBD 7. Acknowledgements TBD 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5014] Nordmark, E., Chakrabarti, S., and J. Laganier, "IPv6 Socket API for Source Address Selection", RFC 5014, September 2007. 8.2. Informative References [I-D.draft-bhandari-dhc-class-based-prefix-04] , "DHCPv6 class based prefix ", draft-bhandari-dhc-class- based-prefix-04 (work in progress), February 2013. [I-D.draft-ietf-dmm-best-practices-gap-analysis-01] , "Distributed Mobility Management: Current practices and gap analysis ", draft-ietf-dmm-best-practices-gap- analysis-01 (work in progress), June 2013. [I-D.draft-korhonen-6man-prfix-properties] , "IPv6 Prefix Properties", draft-korhonen-6man-prfix- properties (work in progress), February 2013. Liu, et al. Expires May 10, 2014 [Page 4]
Internet-Draft draft-liu-dmm-mobility-api-02 November 2013 [I-D.draft-seite-dmm-dma-06] , "Distributed Mobility Anchoring", draft-seite-dmm-dma-06 (work in progress), Nov 2013. Authors' Addresses Dapeng Liu China Mobile 32 Xuanwumen West Street Beijng, Xicheng District 100053 China Phone: +86-13911788933 Email: liudapeng@chinamobile.com Hui Deng China Mobile 32 Xuanwumen West Street Beijng, Xicheng District 100053 China Email: denghui@chinamobile.com Charles E. Perkins Futurewei Inc. 2330 Central Expressway Santa Clara, CA 95050 USA Phone: +1-408-330-5305 Email: charliep@computer.org Liu, et al. Expires May 10, 2014 [Page 5]