RFC 133 (rfc133) - Page 1 of 4

File Transfer and Error Recovery

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Network Working Group                                      R. L. Sunberg
Request for Comments: 133                             Harvard University
NIC 6710                                                   27 April 1971
[Categories C.4, C.5, C.6, D.4, D.7, D.7]


                    FILE TRANSFER AND ERROR RECOVERY


1   FILE TRANSFER PROTOCOL

1A   Handshaking

   I think that Mr Bhushan(RFC #114, NIC 5823) is not strict enough in
   his concept of a transaction sequence.  Every transaction should
   prompt a response from its recipient (recall Kalin's crates --
   RFC #60, NIC 4762).  Control should pass back and forth until the
   server terminates.  The server _always_ gets the last word (more on
   error recovery later).

   Some sample interchanges are given.

       User                Server       Comments

       <...>       ==>                  Establish a connection
                   
       <...>    ==>                  Identify self
                             Ok, ready

       <...>    ==>                  Retrieval request
                            I've got your file
               ==>                  Send it
                   <...>     Here's the first part
               ==>                  Got it
                             All done

       <...>    ==>                  Store request
                            Ok, go ahead
       <...>    ==>                  Here's some protection stuff
                            Ok
       <...>    ==>                  Here's the file
                             Got it.  All done.

   See section 2B, below, for examples of error recovery.







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