RFC 3122 (rfc3122) - Page 3 of 20

Extensions to IPv6 Neighbor Discovery for Inverse Discovery Specification

RFC 3122         Extensions to IPv6 Neighbor Discovery         June 2001


1. Introduction

   This document defines extensions to the IPv6 Neighbor Discovery
   (ND)[IPv6-IND].  The extensions are called IPv6 Inverse Neighbor
   Discovery (IND).  The IPv6 Inverse Neighbor Discovery (IND) allows a
   node that knows the link-layer address of a directly connected remote
   node to learn the IPv6 addresses of that node.  A node using IND
   sends solicitations and receives advertisements for one or more IPv6
   addresses corresponding to a known link-layer address.

   The Inverse Neighbor Discovery (IND) was originally developed for
   Frame Relay networks, but may also apply to other networks with
   similar behavior.

   The keywords MUST, MUST NOT, MAY, OPTIONAL, REQUIRED, RECOMMENDED,
   SHALL, SHALL NOT, SHOULD, SHOULD NOT are to be interpreted as defined
   in [KEYWORDS].

   There are a number of similarities and differences between the
   mechanisms described here and those defined for Inverse ARP for IPv4
   in [INV-ARP] or its replacement documents.

2. Inverse Neighbor Discovery Messages

   The following messages are defined:

2.1. Inverse Neighbor Discovery Solicitation Message

   A node sends an Inverse Neighbor Discovery Solicitation message to
   request an IPv6 address corresponding to a link-layer address of the
   target node while also providing its own link-layer address to the
   target.  Since the remote node IPv6 addresses are not known, Inverse
   Neighbor Discovery (IND) Solicitations are sent as IPv6 all-node
   multicasts [IPv6], [IPv6-FR], [ENCAPS].  However, at link layer
   level, an IND Solicitation is sent directly to the target node,
   identified by the known link-layer address.

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   |   Options ...
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