Appendix A. Summary of Changes from RFC 8415

This section preserves the RFC text for DHCPv6, including message exchanges, relay behavior, DUIDs, IA_NA, IA_TA, IA_PD, DHCP options, RKAP authentication, IANA registries, normative requirements, and appendix option-appearance matrices.

Original RFC Text

Appendix A.  Summary of Changes from RFC 8415

   This appendix provides a summary of the differences between this
   document and [RFC8415]:

   1.  The following mechanisms were obsoleted.  These were not widely
       deployed while adding complexity to client and server
       implementations.  Legacy implementations MAY support them, but
       implementations conformant to this document MUST NOT rely on
       them.  Obsoleting these features does not cause any
       interoperability issues when mixing updated and non-updated
       clients, relay agents, and servers as these mechanisms were
       "optional".

       *  IA_TA option.  The Identity Association for Temporary
          Addresses option has been obsoleted.  A client that needs a
          short-term / special purpose address can use a new IA_NA
          binding to request an address and release it when finished
          with it.

       *  UNICAST option.  The Server Unicast option has been obsoleted.
          Use of this was rarely practical as typically relay agents
          between the client and server need to glean information from
          the communication and cannot be bypassed.

       *  UseMulticast status code.  The UseMulticast status code has
          been obsoleted.  Clients will always multicast messages (as
          Server Unicast option has been obsoleted) and servers will no
          longer check for unicast traffic.

   2.  The following errata reports for [RFC8415] were incorporated:
       [Err6159], [Err6269], and [Err6183].  Note that EID 6269 was no
       longer applicable after the Server Unicast Option was obsoleted.
       Note that EID 6159 was also no longer applicable as temporary
       addresses have been obsoleted.  Indeed, the text that EID 6159
       corrects has been deleted.

   3.  A reference to [RFC7943] was added to Section 13.1 as it
       documents a method that might be used to generate addresses and
       was inadvertently missed when compiling [RFC8415].

   4.  Clarified the UDP ports used by clients, servers, and relay
       agents (Section 7.2).

   5.  Several additional RFCs have been referenced and editorial and
       reviews comments incorporated.