Network Working Group                                          J. Postel
Request for Comments: 959                                    J. Reynolds
                                                                     ISI
Obsoletes RFC: 765 (IEN 149)                                October 1985

                      FILE TRANSFER PROTOCOL (FTP)


Status of this Memo(略)

1.  INTRODUCTION(略)

2.  OVERVIEW

   In this section, the history, the terminology, and the FTP model are
   discussed.  The terms defined in this section are only those that
   have special significance in FTP.  Some of the terminology is very
   specific to the FTP model; some readers may wish to turn to the
   section on the FTP model while reviewing the terminology.

   2.1.  HISTORY

      FTP has had a long evolution over the years.  Appendix III is a
      chronological compilation of Request for Comments documents
      relating to FTP.  These include the first proposed file transfer
      mechanisms in 1971 that were developed for implementation on hosts
      at M.I.T. (RFC 114), plus comments and discussion in RFC 141.

      RFC 172 provided a user-level oriented protocol for file transfer
      between host computers (including terminal IMPs).  A revision of
      this as RFC 265, restated FTP for additional review, while RFC 281
      suggested further changes.  The use of a "Set Data Type"
      transaction was proposed in RFC 294 in January 1982.

      RFC 354 obsoleted RFCs 264 and 265.  The File Transfer Protocol
      was now defined as a protocol for file transfer between HOSTs on
      the ARPANET, with the primary function of FTP defined as
      transfering files efficiently and reliably among hosts and
      allowing the convenient use of remote file storage capabilities.
      RFC 385 further commented on errors, emphasis points, and
      additions to the protocol, while RFC 414 provided a status report
      on the working server and user FTPs.  RFC 430, issued in 1973,
      (among other RFCs too numerous to mention) presented further
      comments on FTP.  Finally, an "official" FTP document was
      published as RFC 454.

      By July 1973, considerable changes from the last versions of FTP
      were made, but the general structure remained the same.  RFC 542
      was published as a new "official" specification to reflect these
      changes.  However, many implementations based on the older
      specification were not updated.

      In 1974, RFCs 607 and 614 continued comments on FTP.  RFC 624
      proposed further design changes and minor modifications.  In 1975,
      RFC 686 entitled, "Leaving Well Enough Alone", discussed the
      differences between all of the early and later versions of FTP.
      RFC 691 presented a minor revision of RFC 686, regarding the
      subject of print files.

      Motivated by the transition from the NCP to the TCP as the
      underlying protocol, a phoenix was born out of all of the above
      efforts in RFC 765 as the specification of FTP for use on TCP.

      This current edition of the FTP specification is intended to
      correct some minor documentation errors, to improve the
      explanation of some protocol features, and to add some new
      optional commands.

   2.2.  TERMINOLOGY
   
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