IPv6 Neighbor Discovery on Wireless Networks
draft-thubert-6man-ipv6-over-wireless-05

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6MAN                                                     P. Thubert, Ed.
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                           31 March 2020
Expires: 2 October 2020

              IPv6 Neighbor Discovery on Wireless Networks
                draft-thubert-6man-ipv6-over-wireless-05

Abstract

   This document describes how the original IPv6 Neighbor Discovery and
   Wireless ND (WiND) can be applied on various abstractions of wireless
   media.

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
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   This Internet-Draft will expire on 2 October 2020.

Copyright Notice

   Copyright (c) 2020 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
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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  IPv6 ND, Wireless ND and ND-Proxies . . . . . . . . . . . . .   4
   4.  IP Models . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Physical Broadcast Domain . . . . . . . . . . . . . . . .   6
     4.2.  Link-Layer Broadcast Emulations . . . . . . . . . . . . .   7
     4.3.  Mapping the IPv6 link Abstraction . . . . . . . . . . . .   8
     4.4.  Mapping the IPv6 subnet Abstraction . . . . . . . . . . .   9
   5.  Wireless Neighbor Discovery . . . . . . . . . . . . . . . . .  10
     5.1.  Introduction to Wireless ND . . . . . . . . . . . . . . .  10
     5.2.  links and Link-Local Addresses  . . . . . . . . . . . . .  11
     5.3.  subnets and Global Addresses  . . . . . . . . . . . . . .  11
   6.  WiND Applicability  . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Case of LPWANs  . . . . . . . . . . . . . . . . . . . . .  13
     6.2.  Case of Infrastructure BSS and ESS  . . . . . . . . . . .  13
     6.3.  Case of Mesh Under Technologies . . . . . . . . . . . . .  15
     6.4.  Case of DMB radios  . . . . . . . . . . . . . . . . . . .  15
       6.4.1.  Using IPv6 ND only  . . . . . . . . . . . . . . . . .  15
       6.4.2.  Using Wireless ND . . . . . . . . . . . . . . . . . .  15
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  18
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  18
   11. Informative References  . . . . . . . . . . . . . . . . . . .  19
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   IEEE STD. 802.1 [IEEEstd8021] Ethernet Bridging provides an efficient
   and reliable broadcast service for wired networks; applications and
   protocols have been built that heavily depend on that feature for
   their core operation.

   Unfortunately, Low-Power Lossy Networks (LLNs) and Wireless Local
   Area Networks (WLANs) generally do not benefit from the same reliable
   and cheap broadcast capabilities as Ethernet links.  As opposed to
   unicast transmissions, the broadcast transmissions over wireless
   links are not subject to automatic retries (ARQ) and can be very
   unreliable.  Reducing the speed at the PHY layer for broadcast
   transmissions can increase the reliability, at the expense of a
   higher relative cost of broadcast on the overall available bandwidth.

   As a result, protocols designed for bridged networks that rely on
   broadcast transmissions often exhibit disappointing behaviours when
   employed unmodified on a local wireless medium (see
   [MCAST-PROBLEMS]).

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