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Router Discovery
Router advertisements can contain a list of prefixes.
These prefixes are used for address autoconfiguration, to maintain
a database of onlink (on the same data link) prefixes, and for duplication
address detection. If a node is onlink, the router forwards packets
to that node. If the node is not onlink, the packets are sent to the
next router for consideration. For IPv6, each prefix in the prefix
list can contain a prefix length, a valid lifetime for the prefix,
a preferred lifetime for the prefix, an onlink flag, and an autoconfiguration
flag. This information enables address autoconfiguration and the setting
of link parameters such as maximum transmission unit (MTU) size and
hop limit.
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