rfc921.txt

RFC 相关的技术文档

   name.

   In the new domain style name system this property must be maintained.
   That is, given the Internet address of a host one must be able to
   find the primary name of that host.  This calls for careful
   management of the distributed database by those in charge of the
   domains and zones.



















Postel                                                          [Page 7]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


The Revised Time Table

   There are three major phases to the implementation of the domain
   names system: (1) putting the machinery in place (servers,
   resolvers), (2) getting the data base installed, (3) changing the
   user programs (mailers, etc.).

      The machinery is now (at last) well along, there is a server for
      TOPS-20, and two different servers for Unix.  The data base now
      contains the ARPA domain and is initialized for the other top
      level domains.  Little has been done to change user programs to
      use the new procedures.

   Done

      Service Design and Specification:  The design and specification
      for the protocol and data base were published (RFC-882, RFC-883).

      Domain Requirements Specification:  The requirements for
      establishing a new domain are published as an RFC (RFC-920).

      Domain Style Names in Table:  Hosts are using their domain style
      names as their official and primary names.  The standard table of
      host names contains domain style names as the official and primary
      name.

      Servers for ARPA Domain:  Several domain name servers are in
      operation to supply host name to internet address translations,
      one of these servers is at the NIC.

   15 Dec 84  Domain Table

      A master table of top level domain names and their associated
      servers is established at the NIC.  Probably this information will
      be added to the HOSTS.TXT file as a new entry type.

   15 Jan 85  Begin New Domain Registration

      New domains may register according to the procedures and
      restrictions described in RFC-920 [5].

   15 Feb 85  Major Machinery Completed

      The principal servers are up and running, there are resolvers
      programmed and tested for the most popular systems (Unix 4.2bsd,
      TOPS-20).



Postel                                                          [Page 8]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


   15 May 85  Significant Use of Resolvers and Servers

      Programs (e.g., Mailers, Telnet, FTP) begin regular use of the new
      mechanisms (resolvers and servers).  This may be done by changing
      the programs to act as resolvers themselves and call on servers
      directly, or to provide system calls that include the resolver
      function to replace old system calls that accessed the host table.

   15 Jul 85  Implementation of the Domain Naming System Completed

      The goal is to complete the switch over to the domain style names
      and the use of the servers by this date.  All programs that
      translate host name to Internet addresses should now use
      procedures based on the use of the domain style names system of
      resolvers and servers and the distributed data base.

   15 Sep 85  Decommission Host Table

      At this point the master host table maintained by the NIC need no
      longer be complete for the DARPA research community.  A full table
      of the DDN operational hosts will be maintained by the NIC.

   15 Oct 85  DDN Plan for Domains Name Service

      The DDN PMO may establish a plan for the future support of name to
      address translations in the DDN community.























Postel                                                          [Page 9]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


Appendix : The Old Time Table

   Here we present the time table from the previous schedule (RFC-897)
   with some comments on what was and was not accomplished.

   -- Nov 83  Plan and Schedule

      At this point the overall plan for the implementation of domain
      style names and name servers, and a schedule of events was
      published (RFC-881).  Also the design and specification for the
      protocol and data base were published (RFC-882, RFC-883).

         <This was done, but the schedule did not work.>

   -- Nov 83  Initial Domain Style Host Name Table

      At this point a version of the host table which includes the
      domain style names is made available (DHOSTS.TXT).

         <This was done, on schedule.>

   -- Feb 84  Domain Requirements Specification

      At this point the requirements for establishing a new domain are
      published as an RFC.

         <This topic was much discussed in the Namedroppers mailing
         list, but no RFC was published until Oct84 [5].>

   14 Mar 84  Begin using Domain Style Names

      At this point all hosts should start using their domain style
      names as their official and primary names.  The standard table of
      host names contains domain style names as the official and primary
      name (DHOSTS.TXT becomes HOSTS.TXT).

         <This was done, on schedule.>

   04 Apr 84  Server for ARPA Domain

      At this point several domain name servers are in operation to
      supply host name to internet address translations, one of these
      servers is at the NIC.

         <This was done, not on schedule, but by Sep84.>




Postel                                                         [Page 10]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


   04 Apr 84  Domain Table

      At this point a master table of top level domain names and their
      associated servers is established at the NIC.

         <Not done yet.>

   02 May 84  Stop using old style Names

      At this point the use of old style names must be completely phased
      out.

         <I think this is done.  Except that some hosts still use the
         OHOSTS.TXT file.>

   02 May 84  Certain New Domains

      At this point a few new domains may be established, in particular
      the DDN domain.

         <Not done yet.  Well, "DDN" won't be a top level domain
         according to the new rules (see [5]).>

   06 Jun 84  General & Multilevel Domains

      At this point additional new domains may be established, if they
      meet the requirements.  Domain style names may have more than two
      segments.

         <Not done yet.>

   18 Jul 84  Organizational Domains

      Domain style names may identify organizations.  Finding an address
      for a host may involve a level of indirection.

         <Not done yet.>

   05 Sep 84  Decommission Host Table

      At this point the master host table maintained by the NIC need no
      longer be complete for the DARPA research community.  A full table
      of the DDN operational hosts will be maintained by the NIC.

         <Not done yet.>




Postel                                                         [Page 11]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


   03 Oct 84  DDN Plan for Domains Name Service

      At this point the DDN PMO will establish a plan for the future
      support of name to address translations in the DDN community.

         <Not done yet.>











































Postel                                                         [Page 12]



RFC 921                                                     October 1984
Domain Implementation Schedule - Revised


References

   [1]  Postel, J., "The Domain Names Plan and Schedule", RFC-881, USC
        Information Sciences Institute, November 1983.

   [2]  Mockapetris, P., "Domain Names - Concepts and Facilities",
        RFC-882, USC Information Sciences Institute, November 1983.

   [3]  Mockapetris, P., "Domain Names - Implementation and
        Specification", RFC-883, USC Information Sciences Institute,
        November 1983.

   [4]  Postel, J., "Domain Name System Implementation Schedule",
        RFC-897, USC Information Sciences Institute, February 1984.

   [5]  Postel, J., and J. Reynolds, "Domain Requirements", RFC-920, USC
        Information Sciences Institute, October 1984.

   [6]  Mockapetris, P., "The Domain Name System", Proceedings of the
        IFIP 6.5 Working Conference on Computer Message Services,
        Nottingham, England, May 1984.  Also as ISI/RS-84-133,
        June 1984.

   [7]  Mockapetris, P., J. Postel, and P. Kirton, "Name Server Design
        for Distributed Systems", Proceedings of the Seventh
        International Conference on Computer Communication, Sidney,
        Australia, October 1984.  Also as ISI/RS-84-132, June 1984.

   [8]  Feinler, E., K. Harrenstien, Z. Su, and V. White, "DoD Internet
        Host Table Specification", RFC-810, Network Information Center,
        SRI International, March 1982.

   [9]  Harrenstien, K., V. White, and E. Feinler, "Hostnames Server",
        RFC-811, Network Information Center, SRI International,
        March 1982.














Postel                                                         [Page 13]