Which ICMPv6 message type is associated with neighbor solicitation?

The message type associated with neighbor solicitation in ICMPv6 is Type 135. Neighbor solicitation messages are used primarily to determine the link-layer address of a neighbor on the same network segment or to verify the reachability of a neighbor. This functionality is essential in IPv6 for enabling devices to discover one another on the local link and maintain communication effectively.

In contrast, Type 133 is related to router solicitation, which is utilized by hosts to request router advertisements, while Type 136 is designated for neighbor advertisement, which informs other hosts of a node's link-layer address or the status of a neighbor. Type 131 is associated with router advertisement messages that communicate the prefix information essential for SLAAC (Stateless Address Autoconfiguration). Understanding these distinct types is critical for managing and troubleshooting IPv6 networks effectively.