IPv6 ND General Operational Overview: ND Functions, Functional Groups and Message Types
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Relationships Between Functions
The division of ND's overall functionality into nine tasks in three groups is somewhat arbitrary, but provides a good frame of reference for understanding what the protocol does. Obviously some of the functions in different groups are related; next-hop determination uses information obtained as part of parameter discovery. The redirect function is also a form of router-host communication but is distinct from router discovery.
Just as ND is similar to ICMP in its operation, the two protocols are related in another way: the method that messaging is done. ND actually implements its functions using ICMPv6 messages. A set of five message types is described in the ND standard:
More details on how these message types are used can be found in the topics later in this section that describe the three functional groups above in more detail. The structures of each of the five ICMPv6 message types used by ND can be found in the section on ICMPv6 informational message types and formats.
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