68 lines
4.3 KiB
HTML
68 lines
4.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Neighbor discovery" />
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<meta name="abstract" content="Neighbor discovery allows hosts and routers to communicate with one another." />
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<meta name="description" content="Neighbor discovery allows hosts and routers to communicate with one another." />
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<meta name="DC.Relation" scheme="URI" content="rzai2ipv6concepts.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="ipv6neighdisc" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Neighbor discovery</title>
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</head>
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<body id="ipv6neighdisc"><a name="ipv6neighdisc"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Neighbor discovery</h1>
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<div><p>Neighbor discovery allows hosts and routers to communicate with
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one another.</p>
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<div class="p">Neighbor discovery functions are used by IPv6 nodes (hosts or routers)
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to discover the presence of other IPv6 nodes, to determine the link-layer
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addresses of nodes, to find routers that are capable of forwarding IPv6 packets,
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and to maintain a cache of active IPv6 neighbors. IPv6 nodes use these five
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Internet Control Message Protocol version 6 (ICMPv6) messages to communicate
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with other nodes: <dl class="dlexpand"><dt class="dltermexpand">Router solicitation</dt>
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<dd>Hosts send these messages to request routers to generate router advertisements.
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A host sends an initial router solicitation when the host first becomes available
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on the network.</dd>
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<dt class="dltermexpand"><img src="./delta.gif" alt="Start of change" />Router advertisement<img src="./deltaend.gif" alt="End of change" /></dt>
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<dd>Routers send these messages either periodically or in response to a router
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solicitation. The information provided by router advertisements is used by
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hosts to automatically create global interfaces, and associated routes. Router
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advertisements also contain other configuration information used by a host
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such as maximum transmission unit and hop limit.</dd>
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<dt class="dltermexpand">Neighbor solicitation</dt>
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<dd>Nodes send these messages to determine the link-layer address of a neighbor,
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or to verify that a neighbor is still reachable.</dd>
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<dt class="dltermexpand">Neighbor advertisement</dt>
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<dd>Nodes send these messages in response to a neighbor solicitation or as
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an unsolicited message to announce an address change.</dd>
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<dt class="dltermexpand">Redirect</dt>
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<dd>Routers use these messages to inform hosts of a better first hop for a
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destination.</dd>
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</dl>
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</div>
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<p>See RFC 2461 for more information about neighbor discovery and router discovery.
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To view RFC 2461, see <a href="http://www.rfc-editor.org/rfcsearch.html" target="_blank">RFC Editor</a> (www.rfc-editor.org/rfcsearch.html) <img src="www.gif" alt="Link outside Information Center" />.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzai2ipv6concepts.htm" title="Learn basic IPv6 concepts. If you are not sure what the differences are between IPv4 and IPv6, see detailed comparisons, such as how the IPv4 and IPv6 addresses compare to one another, or how IPv4 packet headers differ from IPv6 packet headers.">Concepts: IPv6</a></div>
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</div>
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</div>
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</body>
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</html>
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