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Internet Control Message Protocol version 6
Internet Control Message Protocol version 6 (ICMPv6) is the implementation of the Internet Control Message Protocol (ICMP) for Internet Protocol version 6 (IPv6) defined in RFC 4443.〔RFC 4443, ''Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification''〕 ICMPv6 is an integral part of IPv6 and performs error reporting and diagnostic functions (e.g., ping), and has a framework for extensions to implement future changes.
Several extensions have been published, defining new ICMPv6 message types as well as new options for existing ICMPv6 message types. Neighbor Discovery Protocol (NDP) is a node discovery protocol in IPv6 which replaces and enhances functions of ARP.〔RFC 3315, § 3〕 Secure Neighbor Discovery Protocol (SEND) is an extension of NDP with extra security. Multicast Router Discovery (MRD) allows discovery of multicast routers.
==Technical details==
ICMPv6 messages may be classified into two categories: ''error messages'' and ''information messages''.
ICMPv6 messages are transported by IPv6 packets in which the IPv6 Next Header value for ICMPv6 is set to 58.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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