Internet Control Message Protocol for IPv6 (ICMPv6)
Internet Control Message Protocol (ICMP) reports errors and information to the source nodes regarding the delivery of IP packets to the destination. In IPv4 and IPv6, ICMP defines messages for diagnostic, information, and management purposes. ICMP for IPv6 (ICMPv6), as defined in RFC 2463, handles messages supported by ICMP for IPv4 (ICMPv4) and has additional messages for the specific operation of the IPv6 protocol. As illustrated in Table 3-1, ICMPv6 handles the same basic errors and informational messages as ICMPv4 such as Destination Unreachable, Packet Too Big, Time Exceeded, Echo Request, and Echo Reply.