| Message Type | ICMPv6 Type | Description |
| Router Solicitation | 133 | Sent by IPv6 hosts to the link-local scope allrouters multicast address (FF02::2) to discover IPv6 routers present on the local link. |
| Router Advertisement | 134 | Sent periodically by IPv6 routers to the link-local scope all-nodes multicast address (FF02::1), or sent to the unicast address of a host in response to receiving a Router Solicitation message from that host. (Windows Vista and later versions use multicast for optimization.) Router Advertisement messages provide hosts with the information needed to determine link prefixes, link maximum transmission unit (MTU), whether to use DHCPv6 for address autoconfiguration, and lifetime for autoconfigured addresses. |
| Neighbor Solicitation | 135 | Sent by IPv6 nodes to the solicited-node multicast address of a host to discover the link-layer address of an IPv6 node, or sent to the unicast address of the host to verify the reachability of the host. |
| Neighbor Advertisement | 136 | Sent by an IPv6 node to the unicast address of a host in response to receiving a Neighbor Solicitation message from the host, or sent to the linklocal scope all-nodes multicast address (FF02::1) to inform neighboring nodes of changes to the host's link-layer addresses. |
| Redirect | 137 | Sent by an IPv6 router to the unicast address of a host to inform the host of a more optimal first-hop address for a specific destination. |
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