Multicast Listener Discovery ( MLDv2) reports Inverse Neighbor Discovery Advertisement Message Inverse Neighbor Discovery Solicitation Message The Qtype of the Query is unknown to the Responder. The Responder refuses to supply the answer. The Reply Data field may or may not be empty. The Data field contains an IPv4 address which is the Subject of this Query.Ī successful reply. The Data field contains a name which is the Subject of this Query, or is empty, as in the case of a NOOP. The Data field contains an IPv6 address which is the Subject of this Query. These two subtypes are differentiated by the contents of the Multicast Address field, as described in section 3.6 of RFC 2710 Multicast-Address-Specific Query, used to learn if a particular multicast address has any listeners on an attached link.General Query, used to learn which multicast addresses have listeners on an attached link.There are two subtypes of Multicast Listener Query messages: Reserved for expansion of ICMPv6 error messages Unrecognized Next Header type encountered Source address failed ingress/egress policy Some messages serve the same purpose as the correspondingly named ICMP message types.Ĭommunication with destination administratively prohibited
The code field gives additional context information for the message.
ICMP CHECKSUM VERIFICATION
The checksum field provides a minimal level of integrity verification for the ICMP message.Ĭontrol messages are identified by the value in the type field. The code field value depends on the message type and provides an additional level of message granularity. 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. The header contains only three fields: type (8 bits), code (8 bits), and checksum (16 bits). The ICMPv6 message consists of a header and the protocol payload. ICMPv6 messages are transported by IPv6 packets in which the IPv6 Next Header value for ICMPv6 is set to the value 58. ICMPv6 messages may be classified as error messages and information messages.
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