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<div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">ICMPv6</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 19 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-19" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">19 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A8%D8%B1%D9%88%D8%AA%D9%88%D9%83%D9%88%D9%84_%D8%B1%D8%B3%D8%A7%D8%A6%D9%84_%D8%A7%D9%84%D8%AA%D8%AD%D9%83%D9%85_%D9%84%D9%84%D8%A5%D8%B5%D8%AF%D8%A7%D8%B1_%D8%A7%D9%84%D8%B3%D8%A7%D8%AF%D8%B3_%D9%85%D9%86_%D8%A8%D8%B1%D9%88%D8%AA%D9%88%D9%83%D9%88%D9%84_%D8%A7%D9%84%D8%A5%D9%86%D8%AA%D8%B1%D9%86%D8%AA" title="بروتوكول رسائل التحكم للإصدار السادس من بروتوكول الإنترنت – Arabic" lang="ar" hreflang="ar" data-title="بروتوكول رسائل التحكم للإصدار السادس من بروتوكول الإنترنت" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Catalan" lang="ca" hreflang="ca" data-title="ICMPv6" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Czech" lang="cs" hreflang="cs" data-title="ICMPv6" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – German" lang="de" hreflang="de" data-title="ICMPv6" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Spanish" lang="es" hreflang="es" data-title="ICMPv6" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%BE%D8%B1%D9%88%D8%AA%DA%A9%D9%84_%DA%A9%D9%86%D8%AA%D8%B1%D9%84_%D9%BE%DB%8C%D8%A7%D9%85_%D8%A7%DB%8C%D9%86%D8%AA%D8%B1%D9%86%D8%AA%DB%8C_%D9%86%D8%B3%D8%AE%D9%87_%DB%B6" title="پروتکل کنترل پیام اینترنتی نسخه ۶ – Persian" lang="fa" hreflang="fa" data-title="پروتکل کنترل پیام اینترنتی نسخه ۶" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Internet_Control_Message_Protocol_V6" title="Internet Control Message Protocol V6 – French" lang="fr" hreflang="fr" data-title="Internet Control Message Protocol V6" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Korean" lang="ko" hreflang="ko" data-title="ICMPv6" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Indonesian" lang="id" hreflang="id" data-title="ICMPv6" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Italian" lang="it" hreflang="it" data-title="ICMPv6" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Macedonian" lang="mk" hreflang="mk" data-title="ICMPv6" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Internet_Control_Message_Protocol_for_IPv6" title="Internet Control Message Protocol for IPv6 – Japanese" lang="ja" hreflang="ja" data-title="Internet Control Message Protocol for IPv6" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Polish" lang="pl" hreflang="pl" data-title="ICMPv6" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Portuguese" lang="pt" hreflang="pt" data-title="ICMPv6" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Russian" lang="ru" hreflang="ru" data-title="ICMPv6" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Turkish" lang="tr" hreflang="tr" data-title="ICMPv6" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Ukrainian" lang="uk" hreflang="uk" data-title="ICMPv6" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/ICMPv6" title="ICMPv6 – Vietnamese" lang="vi" hreflang="vi" data-title="ICMPv6" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li 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free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Internet protocol used for error messages in network operations</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent" style="width:26em;"><caption class="infobox-title summary">Internet Control Message Protocol for IPv6</caption><tbody><tr><td colspan="2" class="infobox-subheader"><a href="/wiki/Communication_protocol" title="Communication protocol">Communication protocol</a></td></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:ICMP_header_-_General-en.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/ICMP_header_-_General-en.svg/300px-ICMP_header_-_General-en.svg.png" decoding="async" width="300" height="77" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/ICMP_header_-_General-en.svg/450px-ICMP_header_-_General-en.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/ICMP_header_-_General-en.svg/600px-ICMP_header_-_General-en.svg.png 2x" data-file-width="350" data-file-height="90" /></a></span><div class="infobox-caption">General structure of ICMPv6 Messages</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Abbreviation</th><td class="infobox-data">ICMPv6</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Purpose</th><td class="infobox-data">Auxiliary Protocol for IPv6</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;">Introduction</th><td class="infobox-data">December 1995<span class="noprint">; 29 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1995-12</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;"><a href="/wiki/OSI_model" title="OSI model">OSI layer</a></th><td class="infobox-data"><a href="/wiki/Network_layer" title="Network layer">Network layer</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap; width:25%;"><a href="/wiki/Request_for_Comments" title="Request for Comments">RFC(s)</a></th><td class="infobox-data">RFC 4443</td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist 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a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar nomobile nowraplinks hlist"><tbody><tr><th class="sidebar-title"><a href="/wiki/Internet_protocol_suite" title="Internet protocol suite">Internet protocol suite</a></th></tr><tr><th class="sidebar-heading"> <a href="/wiki/Application_layer" title="Application layer">Application layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Border_Gateway_Protocol" title="Border Gateway Protocol">BGP</a></li> <li><a href="/wiki/Dynamic_Host_Configuration_Protocol" title="Dynamic Host Configuration Protocol">DHCP</a> (<a href="/wiki/DHCPv6" title="DHCPv6">v6</a>)</li> <li><a href="/wiki/Domain_Name_System" title="Domain Name System">DNS</a></li> <li><a href="/wiki/File_Transfer_Protocol" title="File Transfer Protocol">FTP</a></li> <li><a href="/wiki/HTTP" title="HTTP">HTTP</a> (<a href="/wiki/HTTP/3" title="HTTP/3">HTTP/3</a>)</li> <li><a href="/wiki/HTTPS" title="HTTPS">HTTPS</a></li> <li><a href="/wiki/Internet_Message_Access_Protocol" title="Internet Message Access Protocol">IMAP</a></li> <li><a href="/wiki/IRC" title="IRC">IRC</a></li> <li><a href="/wiki/Lightweight_Directory_Access_Protocol" title="Lightweight Directory Access Protocol">LDAP</a></li> <li><a href="/wiki/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol">MGCP</a></li> <li><a href="/wiki/MQTT" title="MQTT">MQTT</a></li> <li><a href="/wiki/Network_News_Transfer_Protocol" title="Network News Transfer Protocol">NNTP</a></li> <li><a href="/wiki/Network_Time_Protocol" title="Network Time Protocol">NTP</a></li> <li><a href="/wiki/Open_Shortest_Path_First" title="Open Shortest Path First">OSPF</a></li> <li><a href="/wiki/Post_Office_Protocol" title="Post Office Protocol">POP</a></li> <li><a href="/wiki/Precision_Time_Protocol" title="Precision Time Protocol">PTP</a></li> <li><a href="/wiki/Open_Network_Computing_Remote_Procedure_Call" class="mw-redirect" title="Open Network Computing Remote Procedure Call">ONC/RPC</a></li> <li><a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a></li> <li><a href="/wiki/Real-Time_Streaming_Protocol" title="Real-Time Streaming Protocol">RTSP</a></li> <li><a href="/wiki/Routing_Information_Protocol" title="Routing Information Protocol">RIP</a></li> <li><a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">SIP</a></li> <li><a href="/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol">SMTP</a></li> <li><a href="/wiki/Simple_Network_Management_Protocol" title="Simple Network Management Protocol">SNMP</a></li> <li><a href="/wiki/Secure_Shell" title="Secure Shell">SSH</a></li> <li><a href="/wiki/Telnet" title="Telnet">Telnet</a></li> <li><a href="/wiki/Transport_Layer_Security" title="Transport Layer Security">TLS/SSL</a></li> <li><a href="/wiki/XMPP" title="XMPP">XMPP</a></li> <li><a href="/wiki/Category:Application_layer_protocols" title="Category:Application layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Transport_layer" title="Transport layer">Transport layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Transmission_Control_Protocol" title="Transmission Control Protocol">TCP</a></li> <li><a href="/wiki/User_Datagram_Protocol" title="User Datagram Protocol">UDP</a></li> <li><a href="/wiki/Datagram_Congestion_Control_Protocol" title="Datagram Congestion Control Protocol">DCCP</a></li> <li><a href="/wiki/Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a></li> <li><a href="/wiki/Resource_Reservation_Protocol" title="Resource Reservation Protocol">RSVP</a></li> <li><a href="/wiki/QUIC" title="QUIC">QUIC</a></li> <li><a href="/wiki/Category:Transport_layer_protocols" title="Category:Transport layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Internet_layer" title="Internet layer">Internet layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Internet_Protocol" title="Internet Protocol">IP</a> <ul><li><a href="/wiki/IPv4" title="IPv4">v4</a></li> <li><a href="/wiki/IPv6" title="IPv6">v6</a></li></ul></li> <li><a href="/wiki/Internet_Control_Message_Protocol" title="Internet Control Message Protocol">ICMP</a> (<a class="mw-selflink selflink">v6</a>)</li> <li><a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a></li> <li><a href="/wiki/Explicit_Congestion_Notification" title="Explicit Congestion Notification">ECN</a></li> <li><a href="/wiki/Internet_Group_Management_Protocol" title="Internet Group Management Protocol">IGMP</a></li> <li><a href="/wiki/IPsec" title="IPsec">IPsec</a></li> <li><a href="/wiki/Category:Internet_layer_protocols" title="Category:Internet layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Link_layer" title="Link layer">Link layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a></li> <li><a href="/wiki/Tunneling_protocol" title="Tunneling protocol">Tunnels</a></li> <li><a href="/wiki/Point-to-Point_Protocol" title="Point-to-Point Protocol">PPP</a></li> <li><a href="/wiki/Medium_access_control" title="Medium access control">MAC</a></li> <li><a href="/wiki/Category:Link_protocols" title="Category:Link protocols"><i>more...</i></a></li></ul></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Internet_protocol_suite" title="Template:Internet protocol suite"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Internet_protocol_suite" title="Template talk:Internet protocol suite"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Internet_protocol_suite" title="Special:EditPage/Template:Internet protocol suite"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p><b>Internet Control Message Protocol version 6</b> (<b>ICMPv6</b>) is the implementation of the <a href="/wiki/Internet_Control_Message_Protocol" title="Internet Control Message Protocol">Internet Control Message Protocol</a> (ICMP) for <a href="/wiki/Internet_Protocol_version_6" class="mw-redirect" title="Internet Protocol version 6">Internet Protocol version 6</a> (IPv6).<sup id="cite_ref-rfc4443_1-0" class="reference"><a href="#cite_note-rfc4443-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> ICMPv6 is an integral part of IPv6 and performs error reporting and diagnostic functions. </p><p>ICMPv6 has a framework for extensions to implement new features. Several extensions have been published, defining new ICMPv6 message types as well as new options for existing ICMPv6 message types. For example, <a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">Neighbor Discovery Protocol</a> (NDP) is a node discovery protocol based on ICMPv6 which replaces and enhances functions of <a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a>.<sup id="cite_ref-" class="reference"><a href="#cite_note-"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Secure_Neighbor_Discovery" title="Secure Neighbor Discovery">Secure Neighbor Discovery</a> (SEND) is an extension of NDP with extra security. <a href="/wiki/Multicast_Listener_Discovery" title="Multicast Listener Discovery">Multicast Listener Discovery</a> (MLD) is used by IPv6 routers for discovering <a href="/wiki/Multicast" title="Multicast">multicast</a> listeners on a directly attached link, much like <a href="/wiki/Internet_Group_Management_Protocol" title="Internet Group Management Protocol">Internet Group Management Protocol</a> (IGMP) is used in <a href="/wiki/IPv4" title="IPv4">IPv4</a>. <a href="/wiki/Multicast_Router_Discovery" class="mw-redirect" title="Multicast Router Discovery">Multicast Router Discovery</a> (MRD) allows the discovery of multicast routers. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Message_types_and_formats">Message types and formats</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=1" title="Edit section: Message types and formats"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>ICMPv6 messages may be classified as <i>error messages</i> and <i>information messages</i>. ICMPv6 messages are transported by IPv6 packets in which the <a href="/wiki/IPv6_packet#Fixed_header" title="IPv6 packet">IPv6 Next Header</a> value for ICMPv6 is set to the value <style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">58</span>. </p><p>The ICMPv6 message consists of a header and the protocol payload. The header contains only three fields: <i>Type</i> (8 bits), <i>Code</i> (8 bits), and <i>Checksum</i> (16 bits). </p> <table class="wikitable" style="text-align: center; border: none;"> <caption>ICMPv6 message </caption> <tbody><tr> <th style="min-width:42px; border-bottom:none; border-right:none;"><i>Offset</i> </th> <th style="border-left:none;"><a href="/wiki/Octet_(computing)" title="Octet (computing)">Octet</a> </th> <th colspan="8">0 </th> <th colspan="8">1 </th> <th colspan="8">2 </th> <th colspan="8">3 </th></tr> <tr> <th style="min-width: 42px;border-top: none;">Octet </th> <th style="min-width: 42px;"><a href="/wiki/Bit" title="Bit">Bit</a> </th> <th style="min-width:11px;">0 </th> <th style="min-width:11px;">1 </th> <th style="min-width:11px;">2 </th> <th style="min-width:11px;">3 </th> <th style="min-width:11px;">4 </th> <th style="min-width:11px;">5 </th> <th style="min-width:11px;">6 </th> <th style="min-width:11px;">7 </th> <th style="min-width:11px;">8 </th> <th style="min-width:11px;">9 </th> <th style="min-width:16px;">10 </th> <th style="min-width:16px;">11 </th> <th style="min-width:16px;">12 </th> <th style="min-width:16px;">13 </th> <th style="min-width:16px;">14 </th> <th style="min-width:16px;">15 </th> <th style="min-width:16px;">16 </th> <th style="min-width:16px;">17 </th> <th style="min-width:16px;">18 </th> <th style="min-width:16px;">19 </th> <th style="min-width:16px;">20 </th> <th style="min-width:16px;">21 </th> <th style="min-width:16px;">22 </th> <th style="min-width:16px;">23 </th> <th style="min-width:16px;">24 </th> <th style="min-width:16px;">25 </th> <th style="min-width:16px;">26 </th> <th style="min-width:16px;">27 </th> <th style="min-width:16px;">28 </th> <th style="min-width:16px;">29 </th> <th style="min-width:16px;">30 </th> <th style="min-width:16px;">31 </th></tr> <tr> <th style="width:35px;">0 </th> <th style="width:30px;">0 </th> <td colspan="8"><i>Type</i> </td> <td colspan="8"><i>Code</i> </td> <td colspan="16"><i>Checksum</i> </td></tr> <tr> <th style="width:35px;">4 </th> <th style="width:30px;">32 </th> <td colspan="32" rowspan="3" style="background: mistyrose;"><i>Message body</i> </td></tr> <tr> <th>8 </th> <th>64 </th></tr> <tr> <th>⋮ </th> <th>⋮ </th></tr></tbody></table> <dl><dt>Type: 8 bits</dt> <dd>Specifies the type of the message. Values in the range from 0 to 127 (high-order bit is 0) indicate an error message, while values in the range from 128 to 255 (high-order bit is 1) indicate an information message.</dd> <dt>Code: 8 bits</dt> <dd>The <i>Code</i> field value depends on the message type and provides an additional level of message granularity.</dd> <dt>Checksum: 16 bits</dt> <dd>Provides a minimal level of integrity verification for the ICMP message. The checksum is calculated from the ICMP message (starting with the <i>Type</i> field), prepended with an IPv6 <i>pseudo-header</i>.<sup id="cite_ref-rfc4443_1-1" class="reference"><a href="#cite_note-rfc4443-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> See below.</dd> <dt>Message body: Variable</dt> <dd>Contents depends on the message.</dd></dl> <div class="mw-heading mw-heading3"><h3 id="Types">Types</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=2" title="Edit section: Types"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Control messages are identified by the value in the <i>type</i> field. The <i>code</i> field gives additional context information for the message. Some messages serve the same purpose as the correspondingly named ICMP message types. </p> <table class="wikitable"> <tbody><tr> <th colspan="2" align="center">Type </th> <th colspan="2" align="center">Code </th></tr> <tr> <th>Value</th> <th>Meaning</th> <th>Value</th> <th>Meaning </th></tr> <tr> <th colspan="4" align="center">ICMPv6 Error Messages </th></tr> <tr> <td rowspan="8">1 </td> <td rowspan="8"><a href="/wiki/Internet_Control_Message_Protocol#Destination_unreachable" title="Internet Control Message Protocol">Destination unreachable</a> </td> <td>0 </td> <td>no route to destination </td></tr> <tr> <td>1 </td> <td>communication with destination administratively prohibited </td></tr> <tr> <td>2 </td> <td>beyond scope of source address </td></tr> <tr> <td>3 </td> <td>address unreachable </td></tr> <tr> <td>4 </td> <td>port unreachable </td></tr> <tr> <td>5 </td> <td>source address failed ingress/egress policy </td></tr> <tr> <td>6 </td> <td>reject route to destination </td></tr> <tr> <td>7 </td> <td>Error in Source Routing Header </td></tr> <tr> <td>2</td> <td><a href="/wiki/IPv6_packet#Fragmentation" title="IPv6 packet">Packet too big</a></td> <td>0 </td></tr> <tr> <td rowspan="2">3 </td> <td rowspan="2"><a href="/wiki/Internet_Control_Message_Protocol#Time_exceeded" title="Internet Control Message Protocol">Time exceeded</a> </td> <td>0 </td> <td>hop limit exceeded in transit </td></tr> <tr> <td>1 </td> <td>fragment reassembly time exceeded </td></tr> <tr> <td rowspan="3">4 </td> <td rowspan="3">Parameter problem </td> <td>0 </td> <td>erroneous header field encountered </td></tr> <tr> <td>1 </td> <td>unrecognized Next Header type encountered </td></tr> <tr> <td>2 </td> <td>unrecognized IPv6 option encountered </td></tr> <tr> <td>100</td> <td>Private experimentation</td> <td></td> <td> </td></tr> <tr> <td>101</td> <td>Private experimentation</td> <td></td> <td> </td></tr> <tr> <td>127</td> <td>Reserved for expansion of ICMPv6 error messages</td> <td></td> <td> </td></tr> <tr> <th colspan="4" align="center">ICMPv6 Informational Messages </th></tr> <tr> <td>128</td> <td><a href="/wiki/Echo_Request" class="mw-redirect" title="Echo Request">Echo Request</a></td> <td>0</td> <td> </td></tr> <tr> <td>129</td> <td><a href="/wiki/Echo_Reply" class="mw-redirect" title="Echo Reply">Echo Reply</a></td> <td>0</td> <td> </td></tr> <tr> <td>130</td> <td>Multicast Listener Query (<a href="/wiki/Multicast_Listener_Discovery" title="Multicast Listener Discovery">MLD</a>)</td> <td>0</td> <td> <p>There are two subtypes of Multicast Listener Query messages: </p> <ul><li>General Query, used to learn which multicast addresses have listeners on an attached link.</li> <li>Multicast-Address-Specific Query, used to learn if a particular multicast address has any listeners on an attached link.</li></ul> <p>These two subtypes are differentiated by the contents of the Multicast Address field, as described in section 3.6 of RFC 2710 </p> </td></tr> <tr> <td>131</td> <td>Multicast Listener Report (<a href="/wiki/Multicast_Listener_Discovery" title="Multicast Listener Discovery">MLD</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>132</td> <td>Multicast Listener Done (<a href="/wiki/Multicast_Listener_Discovery" title="Multicast Listener Discovery">MLD</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>133</td> <td>Router Solicitation (<a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>134</td> <td>Router Advertisement (<a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>135</td> <td>Neighbor Solicitation (<a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>136</td> <td>Neighbor Advertisement (<a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a>)</td> <td>0</td> <td> </td></tr> <tr> <td>137</td> <td>Redirect Message (<a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a>)</td> <td>0</td> <td> </td></tr> <tr> <td rowspan="3">138 </td> <td rowspan="3">Router Renumbering<sup id="cite_ref-rfc2894_3-0" class="reference"><a href="#cite_note-rfc2894-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </td> <td>0 </td> <td>Router Renumbering Command </td></tr> <tr> <td>1 </td> <td>Router Renumbering Result </td></tr> <tr> <td>255 </td> <td>Sequence Number Reset </td></tr> <tr> <td rowspan="3">139 </td> <td rowspan="3">ICMP Node Information Query </td> <td>0 </td> <td>The Data field contains an IPv6 address which is the Subject of this Query. </td></tr> <tr> <td>1 </td> <td>The Data field contains a name which is the Subject of this Query, or is empty, as in the case of a NOOP. </td></tr> <tr> <td>2 </td> <td>The Data field contains an IPv4 address which is the Subject of this Query. </td></tr> <tr> <td rowspan="3">140 </td> <td rowspan="3">ICMP Node Information Response </td> <td>0 </td> <td>A successful reply. The Reply Data field may or may not be empty. </td></tr> <tr> <td>1 </td> <td>The Responder refuses to supply the answer. The Reply Data field will be empty. </td></tr> <tr> <td>2 </td> <td>The Qtype of the Query is unknown to the Responder. The Reply Data field will be empty. </td></tr> <tr> <td>141</td> <td>Inverse Neighbor Discovery Solicitation Message</td> <td>0</td> <td> </td></tr> <tr> <td>142</td> <td>Inverse Neighbor Discovery Advertisement Message</td> <td>0</td> <td> </td></tr> <tr> <td>143</td> <td>Multicast Listener Discovery (<a href="/wiki/MLDv2" class="mw-redirect" title="MLDv2">MLDv2</a>) reports<sup id="cite_ref-rfc3810_4-0" class="reference"><a href="#cite_note-rfc3810-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></td> <td></td> <td> </td></tr> <tr> <td>144</td> <td>Home Agent Address Discovery Request Message</td> <td>0</td> <td> </td></tr> <tr> <td>145</td> <td>Home Agent Address Discovery Reply Message</td> <td>0</td> <td> </td></tr> <tr> <td>146</td> <td>Mobile Prefix Solicitation</td> <td>0</td> <td> </td></tr> <tr> <td>147</td> <td>Mobile Prefix Advertisement</td> <td>0</td> <td> </td></tr> <tr> <td>148</td> <td>Certification Path Solicitation (<a href="/wiki/Secure_Neighbor_Discovery_Protocol" class="mw-redirect" title="Secure Neighbor Discovery Protocol">SEND</a>)</td> <td></td> <td> </td></tr> <tr> <td>149</td> <td>Certification Path Advertisement (SEND)</td> <td></td> <td> </td></tr> <tr> <td>151</td> <td>Multicast Router Advertisement (<a href="/wiki/Multicast_router_discovery" title="Multicast router discovery">MRD</a>)</td> <td></td> <td> </td></tr> <tr> <td>152</td> <td>Multicast Router Solicitation (<a href="/wiki/Multicast_router_discovery" title="Multicast router discovery">MRD</a>)</td> <td></td> <td> </td></tr> <tr> <td>153</td> <td>Multicast Router Termination (<a href="/wiki/Multicast_router_discovery" title="Multicast router discovery">MRD</a>)</td> <td></td> <td> </td></tr> <tr> <td>155</td> <td>RPL Control Message</td> <td></td> <td> </td></tr> <tr> <td>160</td> <td>Extended Echo Request<sup id="cite_ref-rfc8335_5-0" class="reference"><a href="#cite_note-rfc8335-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </td> <td>0</td> <td>Request Extended Echo </td></tr> <tr> <td rowspan="5">161</td> <td rowspan="5">Extended Echo Reply<sup id="cite_ref-rfc8335_5-1" class="reference"><a href="#cite_note-rfc8335-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </td> <td>0</td> <td>No Error </td></tr> <tr> <td>1</td> <td>Malformed Query </td></tr> <tr> <td>2</td> <td>No Such Interface </td></tr> <tr> <td>3</td> <td>No Such Table Entry </td></tr> <tr> <td>4</td> <td>Multiple Interfaces Satisfy Query </td></tr> <tr> <td>200</td> <td>Private experimentation</td> <td></td> <td> </td></tr> <tr> <td>201</td> <td>Private experimentation</td> <td></td> <td> </td></tr> <tr> <td>255</td> <td>Reserved for expansion of ICMPv6 informational messages</td> <td></td> <td> </td></tr></tbody></table> <p>Note that the table above is not comprehensive. The current complete list of assigned ICMPv6 types can be found at this link: <a rel="nofollow" class="external text" href="https://www.iana.org/assignments/icmpv6-parameters">IANA: ICMPv6 Parameters</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Checksum">Checksum</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=3" title="Edit section: Checksum"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>ICMPv6 provides a minimal level of message integrity verification by the inclusion of a 16-bit <a href="/wiki/Checksum" title="Checksum">checksum</a> in its header. The checksum is calculated starting with a <a href="/wiki/IPv6_pseudo_header" class="mw-redirect" title="IPv6 pseudo header">pseudo-header</a> of IPv6 header fields according to the IPv6 standard,<sup id="cite_ref-" class="reference"><a href="#cite_note-"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> which consists of the source and destination addresses, the packet length and the next header field, the latter of which is set to the value <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">58</span>. Following this pseudo header, the checksum is continued with the ICMPv6 message. The checksum computation is performed according to Internet protocol standards using 16-bit <a href="/wiki/Ones%27_complement" title="Ones' complement">ones' complement</a> summation, followed by a final ones' complement of the checksum itself and inserting it into the checksum field.<sup id="cite_ref-rfc1071_7-0" class="reference"><a href="#cite_note-rfc1071-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Note that this differs from the way it is calculated for IPv4 in <a href="/wiki/Internet_Control_Message_Protocol" title="Internet Control Message Protocol">ICMP</a>, but is similar to <a href="/wiki/Transmission_Control_Protocol#TCP_checksum_for_IPv6" title="Transmission Control Protocol">the calculation done in TCP</a>. </p> <table class="wikitable" style="text-align: center; border: none;"> <caption>ICMPv6 pseudo-header </caption> <tbody><tr> <th style="min-width:42px; border-bottom:none; border-right:none;"><i>Offset</i> </th> <th style="border-left:none;"><a href="/wiki/Octet_(computing)" title="Octet (computing)">Octet</a> </th> <th colspan="8">0 </th> <th colspan="8">1 </th> <th colspan="8">2 </th> <th colspan="8">3 </th></tr> <tr> <th style="min-width: 42px;border-top: none;">Octet </th> <th style="min-width: 42px;"><a href="/wiki/Bit" title="Bit">Bit</a> </th> <th style="min-width:11px;">0 </th> <th style="min-width:11px;">1 </th> <th style="min-width:11px;">2 </th> <th style="min-width:11px;">3 </th> <th style="min-width:11px;">4 </th> <th style="min-width:11px;">5 </th> <th style="min-width:11px;">6 </th> <th style="min-width:11px;">7 </th> <th style="min-width:11px;">8 </th> <th style="min-width:11px;">9 </th> <th style="min-width:16px;">10 </th> <th style="min-width:16px;">11 </th> <th style="min-width:16px;">12 </th> <th style="min-width:16px;">13 </th> <th style="min-width:16px;">14 </th> <th style="min-width:16px;">15 </th> <th style="min-width:16px;">16 </th> <th style="min-width:16px;">17 </th> <th style="min-width:16px;">18 </th> <th style="min-width:16px;">19 </th> <th style="min-width:16px;">20 </th> <th style="min-width:16px;">21 </th> <th style="min-width:16px;">22 </th> <th style="min-width:16px;">23 </th> <th style="min-width:16px;">24 </th> <th style="min-width:16px;">25 </th> <th style="min-width:16px;">26 </th> <th style="min-width:16px;">27 </th> <th style="min-width:16px;">28 </th> <th style="min-width:16px;">29 </th> <th style="min-width:16px;">30 </th> <th style="min-width:16px;">31 </th></tr> <tr> <th style="width:35px;">0 </th> <th style="width:30px;">0 </th> <td colspan="32" rowspan="4"><i>Source Address</i> </td></tr> <tr> <th>4 </th> <th>32 </th></tr> <tr> <th>8 </th> <th>64 </th></tr> <tr> <th>12 </th> <th>96 </th></tr> <tr> <th style="width:35px;">16 </th> <th style="width:30px;">128 </th> <td colspan="32" rowspan="4"><i>Destination Address</i> </td></tr> <tr> <th>20 </th> <th>160 </th></tr> <tr> <th>24 </th> <th>192 </th></tr> <tr> <th>28 </th> <th>224 </th></tr> <tr> <th style="width:35px;">32 </th> <th style="width:30px;">256 </th> <td colspan="32"><i>ICMPv6 Length</i> </td></tr> <tr> <th style="width:35px;">36 </th> <th style="width:30px;">288 </th> <td colspan="24"><i>Zeroes</i> </td> <td colspan="8"><i>Next Header<span class="nowrap"> </span>(58)</i> </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="Format">Format</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=4" title="Edit section: Format"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The payload of an ICMPv6 message varies according the type of message being sent. It begins at bit 32 immediately after the header described above. For some messages such as destination unreachable or time exceeded there is no defined message body. </p> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption>Destination Unreachable </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">1</td> <td colspan="8">Code</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Unused </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Message body (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Time Exceeded </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">3</td> <td colspan="8">Code</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Unused </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Message body (Variable Size) </td></tr></tbody></table> </div> <p>Others define a use only for the first four bytes of the body with no other defined content: </p> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption>Packet Too Big </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">2</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">MTU </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Message body (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Parameter Problem </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">4</td> <td colspan="8">Code</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Pointer </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Message body (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Echo Request </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">128</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="16">Identifier</td> <td colspan="16">Sequence Number </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Data (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Echo Reply </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">129</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="16">Identifier</td> <td colspan="16">Sequence Number </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Data (Variable Size) </td></tr></tbody></table> </div> <p>In the case of <a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a> messages the first four bytes are either reserved or used for flags/hoplimit. While the reset of body has unspecified structured data: </p> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Router Solicitation </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">133</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Reserved </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Options (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Router Advertisement </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">134</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="8">Cur Hop Limit</td> <td colspan="1">Managed Address Flag</td> <td colspan="1">Other Configuration Flag</td> <td colspan="6">Reserved</td> <td colspan="16">Router Lifetime </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Reachable Time </td></tr> <tr> <td><b>96</b></td> <td colspan="32">Retrans Time </td></tr> <tr> <td><b>128</b></td> <td colspan="32">Options (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Neighbor Solicitation </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">135</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Reserved </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Target Address (16 bytes) </td></tr> <tr> <td><b>192</b></td> <td colspan="32">Options (Variable Size) </td></tr></tbody></table> </div> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> Neighbor Advertisement </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">136</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="1">From Router (R)</td> <td colspan="1">Solicited Flag(S)</td> <td>Override(O)</td> <td colspan="30">Reserved </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Target Address (16 bytes) </td></tr> <tr> <td><b>192</b></td> <td colspan="32">Options (Variable Size) </td></tr></tbody></table> </div> <p>For a redirect the first bytes of the message body are reserved but not used. This is followed by a Target and destination address. Unspecified options can be attached to the end: </p> <div style="display:inline-table; padding: 0.5em;"> <table class="wikitable" style="text-align:center"> <caption> ICMPv6 Redirect </caption> <tbody><tr> <th>Bit offset</th> <th colspan="8" width="22%">0–7</th> <th colspan="8" width="22%">8–15</th> <th colspan="16" width="44%">16–31 </th></tr> <tr> <td><b>0</b></td> <td colspan="8">137</td> <td colspan="8">0</td> <td colspan="16">Checksum </td></tr> <tr> <td><b>32</b></td> <td colspan="32">Reserved </td></tr> <tr> <td><b>64</b></td> <td colspan="32">Target Address (16 bytes) </td></tr> <tr> <td><b>192</b></td> <td colspan="32">Destination Address (16 bytes) </td></tr> <tr> <td><b>320</b></td> <td colspan="32">Options (Variable Size) </td></tr></tbody></table> </div> <div class="mw-heading mw-heading2"><h2 id="Message_processing">Message processing</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=5" title="Edit section: Message processing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When an ICMPv6 node receives a packet, it must undertake actions that depend on the type of message. The ICMPv6 protocol must limit the number of error messages sent to the same destination to avoid network overloading. For example, if a node continues to forward erroneous packets, ICMP will signal the error to the first packet and then do so periodically, with a fixed minimum period or with a fixed network maximum load. An ICMP error message must never be sent in response to another ICMP error message. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=6" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-rfc4443-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-rfc4443_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-rfc4443_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFA._ContaS._Deering2006" class="citation cs1">A. Conta; <a href="/wiki/Steve_Deering" title="Steve Deering">S. Deering</a> (March 2006). M. Gupta (ed.). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4443"><i>Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification</i></a>. Network Working Group. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC4443">10.17487/RFC4443</a></span>. STD 89. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4443">4443</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Internet+Control+Message+Protocol+%28ICMPv6%29+for+the+Internet+Protocol+Version+6+%28IPv6%29+Specification&rft.pub=Network+Working+Group&rft.date=2006-03&rft_id=info%3Adoi%2F10.17487%2FRFC4443&rft.au=A.+Conta&rft.au=S.+Deering&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc4443&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Internet Standard 89.</i> Obsoletes <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2463">2463</a>. Updates <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2780">2780</a>. Updated by <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4884">4884</a>. </span> </li> <li id="cite_note-0-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-0_2-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFT._MrugalskiM._SiodelskiB._VolzA._Yourtchenko2018" class="citation cs1">T. Mrugalski; M. Siodelski; B. Volz; A. Yourtchenko; M. Richardson; S. Jiang; T. Lemon; T. Winters (November 2018). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8415"><i>Dynamic Host Configuration Protocol for IPv6 (DHCPv6)</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC8415">10.17487/RFC8415</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/2070-1721">2070-1721</a>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8415">8415</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Dynamic+Host+Configuration+Protocol+for+IPv6+%28DHCPv6%29&rft.pub=Internet+Engineering+Task+Force&rft.date=2018-11&rft_id=info%3Adoi%2F10.17487%2FRFC8415&rft.issn=2070-1721&rft.au=T.+Mrugalski&rft.au=M.+Siodelski&rft.au=B.+Volz&rft.au=A.+Yourtchenko&rft.au=M.+Richardson&rft.au=S.+Jiang&rft.au=T.+Lemon&rft.au=T.+Winters&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8415&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Proposed Standard.</i> sec. 3. Obsoletes <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3315">3315</a>, <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3633">3633</a>, <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3736">3736</a>, <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4242">4242</a>, <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7083">7083</a>, <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7283">7283</a> and <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7550">7550</a>. </span> </li> <li id="cite_note-rfc2894-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-rfc2894_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFM._Crawford2000" class="citation cs1">M. Crawford (August 2000). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2894"><i>Router Renumbering for IPv6</i></a>. Network Working Group. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC2894">10.17487/RFC2894</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2894">2894</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Router+Renumbering+for+IPv6&rft.pub=Network+Working+Group&rft.date=2000-08&rft_id=info%3Adoi%2F10.17487%2FRFC2894&rft.au=M.+Crawford&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc2894&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Proposed Standard.</i> </span> </li> <li id="cite_note-rfc3810-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-rfc3810_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFR._VidaL._Costa2004" class="citation cs1">R. Vida; L. Costa, eds. (June 2004). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3810"><i>Multicast Listener Discovery Version 2 (MLDv2) for IPv6</i></a>. Network Working Group. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC3810">10.17487/RFC3810</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3810">3810</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Multicast+Listener+Discovery+Version+2+%28MLDv2%29+for+IPv6&rft.pub=Network+Working+Group&rft.date=2004-06&rft_id=info%3Adoi%2F10.17487%2FRFC3810&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc3810&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Proposed Standard.</i> Updates <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2710">2710</a>. Updated by <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4604">4604</a>. </span> </li> <li id="cite_note-rfc8335-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-rfc8335_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-rfc8335_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFR._BonicaR._ThomasJ._LinkovaC._Lenart2018" class="citation cs1">R. Bonica; R. Thomas; J. Linkova; C. Lenart; M. Boucadair (February 2018). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8335"><i>PROBE: A Utility for Probing Interfaces</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC8335">10.17487/RFC8335</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/2070-1721">2070-1721</a>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8335">8335</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=PROBE%3A+A+Utility+for+Probing+Interfaces&rft.pub=Internet+Engineering+Task+Force&rft.date=2018-02&rft_id=info%3Adoi%2F10.17487%2FRFC8335&rft.issn=2070-1721&rft.au=R.+Bonica&rft.au=R.+Thomas&rft.au=J.+Linkova&rft.au=C.+Lenart&rft.au=M.+Boucadair&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8335&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Proposed Standard.</i> Updates <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc4884">4884</a>. </span> </li> <li id="cite_note-1-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-1_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFS._DeeringR._Hinden2017" class="citation cs1"><a href="/wiki/Steve_Deering" title="Steve Deering">S. Deering</a>; R. Hinden (July 2017). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8200"><i>Internet Protocol, Version 6 (IPv6) Specification</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC8200">10.17487/RFC8200</a></span>. STD 86. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc8200">8200</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Internet+Protocol%2C+Version+6+%28IPv6%29+Specification&rft.pub=Internet+Engineering+Task+Force&rft.date=2017-07&rft_id=info%3Adoi%2F10.17487%2FRFC8200&rft.au=S.+Deering&rft.au=R.+Hinden&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc8200&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Internet Standard 86.</i> sec. 8.1. Obsoletes <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2460">2460</a>. </span> </li> <li id="cite_note-rfc1071-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-rfc1071_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFR._BradenD._BormanC._Partridge1988" class="citation cs1"><a href="/wiki/Bob_Braden" title="Bob Braden">R. Braden</a>; D. Borman; C. Partridge (September 1988). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1071"><i>Computing the Internet Checksum</i></a>. Network Working Group. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC1071">10.17487/RFC1071</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1071">1071</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Computing+the+Internet+Checksum&rft.pub=Network+Working+Group&rft.date=1988-09&rft_id=info%3Adoi%2F10.17487%2FRFC1071&rft.au=R.+Braden&rft.au=D.+Borman&rft.au=C.+Partridge&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc1071&rfr_id=info%3Asid%2Fen.wikipedia.org%3AICMPv6" class="Z3988"></span> <i>Informational.</i> Updated by <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222">RFC <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1141">1141</a>. </span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ICMPv6&action=edit&section=7" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 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title="Template:IPv6"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:IPv6" title="Template talk:IPv6"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:IPv6" title="Special:EditPage/Template:IPv6"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Internet_Protocol_version_693" style="font-size:114%;margin:0 4em"><a href="/wiki/Internet_Protocol" title="Internet Protocol">Internet Protocol</a> <a href="/wiki/IPv6" title="IPv6">version 6</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/IPv6" title="IPv6">IPv6</a></li> <li><a href="/wiki/IPv6_address" title="IPv6 address">IPv6 address</a></li> <li><a href="/wiki/IPv6_packet" title="IPv6 packet">IPv6 packet</a></li> <li><a href="/wiki/Mobile_IP#Changes_in_IPv6_for_Mobile_IPv6" title="Mobile IP">Mobile IPv6</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Deployment</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/IPv6_deployment" title="IPv6 deployment">IPv6 deployment</a> <ul><li><a href="/wiki/6rd" class="mw-redirect" title="6rd">6rd</a></li></ul></li> <li><a href="/wiki/World_IPv6_Day_and_World_IPv6_Launch_Day" title="World IPv6 Day and World IPv6 Launch Day">World IPv6 Day and World IPv6 Launch Day</a></li> <li><a href="/wiki/Comparison_of_IPv6_support_in_operating_systems" title="Comparison of IPv6 support in operating systems">Comparison of IPv6 support in operating systems</a></li> <li><a href="/wiki/Comparison_of_IPv6_support_in_common_applications" title="Comparison of IPv6 support in common applications">Comparison of IPv6 support in common applications</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">IPv4 to IPv6 topics</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/IPv4_address_exhaustion" title="IPv4 address exhaustion">IPv4 address exhaustion</a></li> <li><a href="/wiki/IPv6_transition_mechanism" title="IPv6 transition mechanism">IPv6 transition mechanism</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related protocols</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DHCPv6" title="DHCPv6">DHCPv6</a></li> <li><a href="/wiki/Internet_Control_Message_Protocol_for_IPv6" class="mw-redirect" title="Internet Control Message Protocol for IPv6">ICMPv6</a> <ul><li><a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery 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