This document updates the text from RFC 3315 (the original DHCPv6
specification) and incorporates prefix delegation (RFC 3633),
stateless DHCPv6 (RFC 3736), an option to specify an upper bound for
how long a client should wait before refreshing information (RFC
4242), a mechanism for throttling DHCPv6 clients when DHCPv6 service
is not available (RFC 7083), and relay agent handling of unknown
messages (RFC 7283).