rfc881.txt

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RFC 881                                                    November 1983
The Domain Names Plan and Schedule                                      


         "BLAT-VAX" in the ARPA domain could set up mailboxes of the
         form "[e-mail]" and use the domain server mechanisms for
         mapping these to the host that accepts the mail for the
         organization.

      Mailbox binding will allow different mappings for individual
      mailboxes of an organization or host to the destination host.  It
      will also provide for aliases and mailing groups.

         Mailbox binding requires adding information on individual
         mailboxes to the domain server database.  This could be a
         substantial increase in the database size and management
         responsibility.

   The ARPA Community and the DDN Community

      This plan will be put into effect in the ARPA community.

      The DDN community will adopt the domain style names, but will
      continue with the present scheme of a centrally maintained table
      copied periodically by each host.  Once the use of domain servers
      has been demonstrated by use in the ARPA community, the DDN-PMO
      will establish a schedule for implementing the domain system in
      the DDN community.

      This means that there may be a period of a year or more with the
      two communities using different schemes for distributing
      information about host names and addresses.

      Specifically:

         The NIC will maintain a table a "HOSTS.TXT" style table for use
         by DDN hosts.  This table will contain domain style names for
         all DDN hosts (e.g., USC-ISIA.DDN).  Since this is the only
         information DDN hosts will use to translate host names to
         Internet Addresses, this table must also contain names and
         addresses of ARPA community hosts of interest to DDN users
         (e.g., USC-ISIF.ARPA).

         There will be a domain server with data for the DDN domain.
         That is, hosts in the ARPA community that use the domain system
         of resolvers and servers will be able to access servers that
         have the data base covering the DDN community.

      It is quite likely that the table for the use of the DDN hosts
      will be incomplete with respect to coverage of the ARPA community
      and any new domains that are established.  One motivation for the
      domain system is the subdivision of name management to avoid the


Postel                                                          [Page 6]



RFC 881                                                    November 1983
The Domain Names Plan and Schedule                                      


      difficulty of keeping a global table of all hosts.  As the ARPA
      community moves to significant use of the domains system the
      maintenance of a global table for use by the DDN community will
      become very difficult.

      This means that DDN hosts might not be able to look up the names
      of some ARPA community hosts in their local tables.  In some cases
      this might result in an inability establish communication from a
      DDN hosts to such "unknown" ARPA community hosts.

         The most likely case is for a computer mail message sent from
         an ARPA community user on a host know to name servers but not
         in the central table to a user on a DDN community host that
         relies on a local copy of the central table.  When the DDN user
         attempts to answer this message his mail program will attempt
         to look up the host name.  This will fail, and the most likely
         result is that the mail program will tell the user that there
         is no such host!

      Please note that DDN community hosts are permitted (even
      encouraged) to implement the domain system in parallel with the
      ARPA community.  However, there is no requirement that they do so
      until called for in the schedule to be established by the DDN-PMO.



























Postel                                                          [Page 7]



RFC 881                                                    November 1983
The Domain Names Plan and Schedule                                      


The Schedule

   04-Oct-83  The ARPANET/MILNET Logical Split

   02-Nov-83  Publish Domain Name Documents

      This Plan and Schedule (RFC-881), Domain Names - Concepts and
      Facilities (RFC-882), and Domain Names - Implementation
      Specification (RFC-883).

   16-Nov-83  Make Available Domain Style Host Table

      Create a copy a modified version of the HOSTS.TXT table named
      DHOSTS.TXT with an additional name (as the first name) in each
      entry of the form "official-host-name.ARPA".

   15-Dec-83  Final Specification of simple Query & Reply Protocol
   Available

      This specification covers the protocol procedures and message
      formats for the simple queries and replies to support translating
      host names to internet addresses only.

   15-Dec-83  Make Limited Domain Server & Resolvers Available

      An example limited domain server running on TOPS-20 and example
      limited resolvers running on each of TOPS-20 and VAX-Berkeley-Unix
      should be made available for testing and copying.  This simple
      version would be able to do queries and responses for host name to
      internet address translation only, and the servers would still use
      the global table.  This simple server would not refer the resolver
      to another server.  This simple server and these resolvers operate
      in datagram mode only.  However, this would allow user programs to
      begin to use the servers.

   01-Feb-84  Specification of Domain Requirements Available

      Detailed requirements for qualifying a set of hosts as a domain,
      and procedure for registering new domains is published.

   15-Feb-84  The ARPANET/MILNET Access Controls

      MILNET access controls installed in the MILNET/ARPANET gateways
      and TAC user access controls put into effect (see DDN MGT Bulletin
      16). [Date approximate.]





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RFC 881                                                    November 1983
The Domain Names Plan and Schedule                                      


   07-Mar-84  Replace Main Host Table with Domain Style Host Table

      The DHOSTS.TXT becomes HOSTS.TXT.

   14-Mar-84  Final Specification of Query & Reply Protocol Available

      This specification covers the protocol procedures and message
      formats for the all queries and replies between resolvers and
      servers.

   14-Mar-84  Make Improved Domain Servers & Resolvers Available

      An example improved domain server running on TOPS-20 and example
      improved resolvers running on each of TOPS-20 and
      VAX-Berkeley-Unix should be made available for testing and
      copying.  This version should be able to do any of the defined
      query and response operations, and should support segmented data
      base by refering resolvers to other servers if necessary.  This
      server loads zone data from local master files only, and only at
      program start up.  This server and these resolvers operate with
      either datagram or reliable connection style communication.  This
      version does not support the data base update portion of the
      server protocol.

   04-Apr-84  Domain Servers for ARPA Domain Available

      Authoritative domain servers for the ARPA domain will be available
      for regular use.

   02-May-84  Introduce New Domains in the Main Host Table

      Add the DDN domain.  Most MILNET hosts will change to the DDN
      domain.  Authoritative domain servers for the DDN domain will be
      available for regular use.  HOSTS.TXT is updated.

   02-May-84  Establish a New Top Level Domains Only Table

      Start a new table, DOMAINS.TXT, that lists only the top level
      domains and the entries for their domain servers.

   16-May-84  Final Specification of Maintenance Protocol Available

      This specification covers the protocol procedures and message
      formats for the data base update exchanges between servers.

   16-May-84  Make Improved Domain Servers & Resolvers Available

      An example improved domain server running on TOPS-20 and example


Postel                                                          [Page 9]



RFC 881                                                    November 1983
The Domain Names Plan and Schedule                                      


      improved resolvers running on each of TOPS-20 and
      VAX-Berkeley-Unix should be made available for testing and
      copying.  This version should be able to do any of the defined
      query and response operations, and should support segmented data
      base by refering resolvers to other servers if necessary.  This
      server loads zone data from local master files and remote servers,
      and only at program start up.  This server and these resolvers
      operate with either datagram or reliable connection style
      communication.

   06-Jun-84  Permit the Introduction of New Domains

      Organizations meeting the requirements for establishing new
      domains will be allowed to begin use of new domain names.  New
      domains must be registered, meet the requirements (including
      running domain servers), and will be added to the HOSTS.TXT table.

   18-Jul-84  Final Specification of Complete Protocol Available

      This specification covers the protocol procedures and message
      formats for the complete domain names system.

   18-Jul-84  Make Full Domain Servers & Resolvers Available

      At this point an example domain server and an example resolver
      running on each of TOPS-20 and VAX-Berkeley-Unix should be made
      available for testing and copying.  This version should be able to
      do any of the defined query and response operations, and should
      support segmented data base by refering resolvers to other servers
      if necessary.  This version should support the data base update
      portion of the server protocol, including data aging and dynamic
      zone updating from remote servers.  This is a full implementation
      of the protocol.

   05-Sep-84  Discontinue the Full Host Table for the ARPA Community

      Stop maintaining the HOSTS.TXT table for the ARPA community.  The
      HOSTS.TXT table continues to be used in the DDN community with
      complete data for the DDN domain, however the data for the ARPA
      and other domains may no longer be complete or fully up to date.

   03-Oct-84  DDN-PMO Schedules DDN Implementation

      The DDN-PMO establishes the schedule for the implementation of the
      domain system in the DDN community.





Postel                                                         [Page 10]