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The TCP/IP Guide  9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)       9  TCP/IP Internet Layer (OSI Network Layer) Protocols            9  Internet Control Message Protocol (ICMP/ICMPv4 and ICMPv6)                 9  ICMP Message Types and Formats                      9  ICMP Version 6 (ICMPv6) Informational Message Types and Formats

ICMPv6 Echo Request and Echo Reply Messages 1 2 3 ICMPv6 Neighbor Advertisement and Neighbor Solicitation Messages

ICMPv6 Router Solicitation Message Format

The format of an ICMPv6 Router Solicitation message is as shown Table 110 and Figure 159.

Router Solicitation messages are normally sent to the IPv6 “all routers” multicast address; this is the most efficient method since routers are required to subscribe to this multicast address while hosts will ignore it. A routine (unsolicited) Router Advertisement is sent to all devices using the “all nodes” multicast address for the local network. A Router Advertisement that is sent in response to a Router Solicitation goes unicast back to the device that sent the solicitation.

ICMPv6 Echo Request and Echo Reply Messages 1 2 3 ICMPv6 Neighbor Advertisement and Neighbor Solicitation Messages