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Versions: 00                                                            
dna                                                          S. Yamamoto
Internet-Draft                                               C. Williams
Expires: August 9, 2004                                    KDDI Labs USA
                                                                G. Daley
                                                  Monash University CTIE
                                                        M. Parthasarathy
                                                        February 9, 2004

                Detecting Network Attachment Terminology

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   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://

   The list of Internet-Draft Shadow Directories can be accessed at

   This Internet-Draft will expire on August 9, 2004.

Copyright Notice

   Copyright (C) The Internet Society (2004). All Rights Reserved.


   The DNA working group is working on solutions for hosts to detect
   their IP layer connectivity and configuration status quickly which in
   turn would allow it to reconfigure the IP link faster than today.
   This document aims at providing definitions for key terms used by the

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Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2. Terminology  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3. Security Considerations  . . . . . . . . . . . . . . . . . . . . 4
   4. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . 4
      Normative references . . . . . . . . . . . . . . . . . . . . . . 4
      Informative References . . . . . . . . . . . . . . . . . . . . . 4
      Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
      Intellectual Property and Copyright Statements . . . . . . . . . 6

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1. Introduction

   Hosts need link-layer connectivity and correct IP layer configuration
   for sending and receiving packets.  When a node suspects that
   link-layer connectivity has undergone change, it needs to check
   whether its IP layer connectivity or configuration are still valid.
   The DNA working group is working on solutions to detect IP layer
   connectivity changes and re-configures the IP configuration quickly.
   This document defines the key terms used by the group.

2. Terminology

   The following terminology is presented to describe components that
   are required for reliable detection of network attachment.

   Link Instance: A domain where all connected hosts may be reached
      through local broadcast or all-nodes multicast transmission.

   Neighbor: A host or router on the same link-instance as the node.

   Internet Connectivity: A state where a host can maintain
      communications with arbitrary destinations on the Internet.

   Network Attachment: An event subsequent to link-layer connection
      occurs when a host is able to send and receive some IP datagrams
      (particularly for configuration purposes) within a link-instance.

   IP Subnet: A range of addresses that share a common global prefix.

   Full Reachability: Also called Bi-directional Reachability. A
      neighbor is supposed to be fully reachable if one can both send
      and receive packets.

   IP link: A communication facility or medium over which nodes can
      communicate at the link layer.

   Partial Reachability Evidence that a host is within transmission or
      reception range of a neighbor.  Reachability state is assumed to
      be available if a host receives advertisements from or data
      through the neighbor in question.

   Link Hint: f An indication from the link-layer to the IP layer that a
      change in link state may have occurred.  These hints, while not
      considered authoritative for IP configuration, but can be used to
      initiate reachability checks or start to inquire about network

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   Eager Configuration Switching: An algorithm by which systems eagerly
      perform configuration signaling, without checking reachability of
      their neighbors or routers.  Note that these systems may cause
      excessive configuration and signaling in some network topologies.

   Lazy Configuration Switching: An algorithm by which systems check
      reachability with its currently configured routers before
      undertaking configuration signaling.  Most reachability checks
      take some time to determine a neighbor's absence, which will cause
      delays to configuration in lazy systems.

   Change Detection Evidence that the IP configuration on a link has
      changed, and that the host's IP address, routes, MLD groups or
      other data that may require updating.

   Link Information Parameters: Link Information Parameters are defined
      in the context of DNA as signal strength, signal quality and

3. Security Considerations

   This document presents only terminology.  There are no security
   issues in this document.

4. Acknowledgments

   Thanks to participants within the DNA BOF whose emails and input help
   craft the terminology in this document.

Normative references

   [1]  Johnson, D., Perkins, C. and J. Arkko, "Mobility Support in
        IPv6", draft-ietf-mobileip-ipv6-24.txt Work In Progress, June

Informative References

   [2]  Manner, J. and M. Kojo, "Mobility Related Terminology",
        draft-ietf-seamoby-mobility-terminology-05.txt Work In Progress,
        , November 2003.

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Authors' Addresses

   Shu Yamamoto
   KDDI Labs USA
   Palo Alto  94301
   United States

   Phone: +650.566.8165
   EMail: shu@kddilabs.com

   Carl Williams
   KDDI Labs USA
   Palo Alto, CA 94301

   Phone: +1.650.279.5903
   EMail: carlw@kddilabs.com

   Greg Daley
   Monash University CTIE
   Department of Electrical and Computer Systems Engineering

   EMail: greg.daley@eng.monash.edu.au

   Mohan Parthasarathy
   Palo Alto, CA  95015
   United States

   EMail: mohanp@sbcglobal.net

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Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
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   The IETF invites any interested party to bring to its attention any
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   This document and the information contained herein is provided on an

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   Funding for the RFC Editor function is currently provided by the
   Internet Society.

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