On-Demand Mobility Management
RFC 8653

Document Type RFC - Informational (October 2019; No errata)
Last updated 2019-10-31
Replaces draft-yegin-dmm-ondemand-mobility
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Sri Gundavelli
Shepherd write-up Show (last changed 2018-05-02)
IESG IESG state RFC 8653 (Informational)
Consensus Boilerplate Yes
Telechat date
Responsible AD Suresh Krishnan
Send notices to "Dapeng Liu" <max.ldp@alibaba-inc.com>, Sri Gundavelli <sgundave@cisco.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions


Internet Engineering Task Force (IETF)                          A. Yegin
Request for Comments: 8653                                      Actility
Category: Informational                                         D. Moses
ISSN: 2070-1721                                                    Intel
                                                                 S. Jeon
                                                 Sungkyunkwan University
                                                            October 2019

                     On-Demand Mobility Management

Abstract

   Applications differ with respect to whether they need session
   continuity and/or IP address reachability.  The network providing the
   same type of service to any mobile host and any application running
   on the host yields inefficiencies, as described in RFC 7333.  This
   document defines a new concept of enabling applications to influence
   the network's mobility services (session continuity and/or IP address
   reachability) on a per-socket basis, and suggests extensions to the
   networking stack's API to accommodate this concept.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8653.

Copyright Notice

   Copyright (c) 2019 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   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.  Notational Conventions
   3.  Solution
     3.1.  High-Level Description
     3.2.  Types of IP Addresses
     3.3.  Granularity of Selection
     3.4.  On-Demand Nature
   4.  Backwards Compatibility Considerations
     4.1.  Applications
     4.2.  IP Stack in the Mobile Host
     4.3.  Network Infrastructure
     4.4.  Merging this work with RFC 5014
   5.  Security Considerations
   6.  IANA Considerations
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  Conveying the Desired Address Type
   Acknowledgements
   Contributors
   Authors' Addresses

1.  Introduction

   In the context of Mobile IP [RFC5563] [RFC6275] [RFC5213] [RFC5944],
   the following two attributes are defined for IP service provided to
   mobile hosts:

   Session Continuity
      The ability to maintain an ongoing transport interaction by
      keeping the same local endpoint IP address throughout the lifetime
      of the IP socket despite the mobile host changing its point of
      attachment within the IP network topology.  The IP address of the
      host may change after closing the IP socket and before opening a
      new one, but that does not jeopardize the ability of applications
      using these IP sockets to work flawlessly.  Session continuity is
      essential for mobile hosts to maintain ongoing flows without any
      interruption.

   IP Address Reachability
      The ability to maintain the same IP address for an extended period
      of time.  The IP address stays the same across independent
      sessions, even in the absence of any session.  The IP address may
      be published in a long-term registry (e.g., DNS) and is made
      available for serving incoming (e.g., TCP) connections.  IP
      address reachability is essential for mobile hosts to use
      specific/published IP addresses.

   Mobile IP is designed to provide both session continuity and IP
   address reachability to mobile hosts.  Architectures using these
   protocols (e.g., 3GPP, 3GPP2, WiMAX) ensure that any mobile host
   attached to a compliant network can enjoy these benefits.  Any
   application running on these mobile hosts is subjected to the same
   treatment with respect to session continuity and IP address
   reachability.

   Achieving session continuity and IP address reachability with Mobile
   IP incurs some cost.  Mobile IP forces the mobile host's IP traffic
   to traverse a centrally located router (Home Agent, HA), which incurs
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