Packet loss resiliency for Router Solicitations
draft-krishnan-6man-resilient-rs-00

The information below is for an old version of the document
Document Type Active Internet-Draft (individual)
Last updated 2012-07-09
Replaced by draft-ietf-6man-resilient-rs, rfc7559
Stream (None)
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
6man Working Group                                           S. Krishnan
Internet-Draft                                                  Ericsson
Intended status: Standards Track                               D. Anipko
Expires: January 10, 2013                                      D. Thaler
                                                               Microsoft
                                                            July 9, 2012

            Packet loss resiliency for Router Solicitations
                  draft-krishnan-6man-resilient-rs-00

Abstract

   When an interface on a host is initialized, the host transmits Router
   Solicitations in order to minimize the amount of time it needs to
   wait until the next unsolicited multicast Router Advertisement is
   received.  In certain scenarios, these router solicitations
   transmitted by the host might be lost.  This document specifies a
   mechanism for hosts to cope with the loss of the initial Router
   Solicitations.

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 January 10, 2013.

Copyright Notice

   Copyright (c) 2012 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Krishnan, et al.        Expires January 10, 2013                [Page 1]
Internet-Draft         Resilient RS Retransmission             July 2012

   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  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     1.1.  Conventions used in this document . . . . . . . . . . . . . 3
   2.  Proposed algorithm  . . . . . . . . . . . . . . . . . . . . . . 4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . . . 4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 4

Krishnan, et al.        Expires January 10, 2013                [Page 2]
Internet-Draft         Resilient RS Retransmission             July 2012

1.  Introduction

   As specified in [RFC4861], when an interface on a host is
   initialized, in order to obtain Router Advertisements quickly, a host
   transmits up to MAX_RTR_SOLICITATIONS (3) Router Solicitation
   messages, each separated by at least RTR_SOLICITATION_INTERVAL (4)
   seconds.  In certain scenarios, these router solicitations
   transmitted by the host might be lost.

   The generic scenario is that the interface on the host comes up
   before it gets access to a router.  Examples are

   a.  Host is connected to a bridged residential gateway (over Ethernet
       or WiFi).  LAN connectivity is achieved at interface
       initialization, but the upstream WAN connectivity is not active
       yet.  In this case, the host just gives up after the initial RS
       retransmits.
   b.  Accesses that turn off periodic RAs and operate only in a RS
       triggered environment.  In this case if the link between the AP
       and the host comes up before the link between the AP and the
       Controller/Router, the host will never be able to connect.

   Once the initial RSs are lost, the host gives up and assumes that
   there are no routers on the link as specified in Section 6.3.7 of
   [RFC4861].  The host will not have any form of Internet connectivity
   until the next unsolicited multicast Router Advertisement is
   received.  These Router Advertisements are transmitted at most
   MaxRtrAdvInterval seconds apart (maximum value 1800 seconds).  In the
   worst case scenario, a host would be without any connectivity, on
   average, for half this period (900 seconds).  This delay may be
   unacceptable in some scenarios.
Show full document text