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+Network Working Group                            V. Cerf
+Request for Comments #163                        19 May 71
+NIC #6775                                        UCLA - NMC
+Categories:  D.7                                 Computer Science
+Updates:  None
+Obsoletes:  None
+
+
+                        DATA TRANSFER PROTOCOLS
+
+This is an informal statement of material discussed at the SJCC.  There
+are two peoblems.
+
+   1.  Movement of data from one site to another.
+   2.  Interpretation of the data at receiving site.
+
+The first task (1) requires a simple protocol which accomplishes the
+following
+
+   1)  Standard connection procedure for connecting
+       transmitting and receiving processes
+
+   2)  Standard packaging which allows network to
+       collect the transmitted data stream in the
+       right order and know when the end of the
+       file has been reached.
+
+Standard Connection Procedure
+
+Suppose every HOST has a process charged with the responsibility of
+sending and receiving files between -HOSTS-(processes?)[The Data
+Manager].  If the Data Manager offers to listen on a given socket for
+file xmt requests, then ICP is sufficient to establish a connection
+between a serving Data Manager and a using process.
+
+We have completely avoided the discussion of data interpretation, and
+also the problem of control.  For instance, we have not said how a
+process can ask the Data Manager to send a file of a par- ticular name,
+nor how to end the transmission of a file.  This is deferred for later.
+
+Another desirable ability is to have processes transmit files to each
+other independent of the HOST Data Manager.  ICP should suffice, for the
+creation of a full duplex connection.  File naming, and format
+interpretation are left to the individual process to solve.
+
+It is of interest to note that files need not have names.  If two
+processes are connected, then the file name is in a sense implicit in
+the sending and receiving socket pair.  One imagines, however, that
+
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+
+                                                                [Page 1]
+
+connections with Data Managers for the purpose of file transmission are
+too transient to serve as permanent file names, so information about
+file name will be needed by the Data Manager.  This information could be
+supplied either embedded in the file transmission data stream, or
+supplied over a separate control connection established at ICP time.
+
+It seems reasonable that a Data Manager have a network-wide, fixed
+socket number on which it is listening to service data transmission
+requests.* In this sense, it acts much like the Network Logger.  For
+inter-process file transmission, less rigidity seems called for, and we
+can leave such decisions to the individual peocesses communicating with
+each other.  Public processes at serving HOSTS could have known (nia
+NIC?) sockets over which file transmission is acceptable.
+
+Standard Packaging
+
+We naively imagine that very little in the way of formatting is needed
+to move data across the connection.  A few bits (8?) at the beginning of
+transmission could specify the formatting protocol (e.g. arbitrary bit
+string until connection closed, count field + data, break chars, etc.)
+Depending on the selected format mode, the appropriate control bits will
+or will not appear interspersed betweeen the data bits.  Message
+boundaries are totally transparent.
+
+A way of ending the file, possibly without closing the connection, is
+useful, although closing the connection after the RFNM from final
+"record" sent is received by the sending process might be adequate
+(sufficient, but not palatable?)
+
+----
+*ICP causes sockets to be dynamically assigned for the ensuing
+conversation (which might be all 1-way).
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+                                                                [Page 2]
+
+Control
+
+A great many problems come up if the Data Manager serves as a part of
+the HOST filling system.  For example, the Data Manager must know
+whether the process it is serving wants to send a file or receive one.
+In either case, some sort of file name + qualifiers (user ID, security
+codes, access requested, etc.) will be needed to resolve the usual
+access legality, and potential file name ambiguities.  This information
+can be supplied either within a single full duplex data stream (1 per
+ICP request) established by a modified ICP for data transmission.  The
+former seems simplier, sufficient, and immediately implementable.
+
+Data transmission between arbitrary processes probably does not need as
+much formal control protocol as process-to/from-DM (data Manager)
+connection.  Ad hoc procedures can be established by trading information
+on previously established connections; regularity is nice, so perhaps a
+standard set of control protocols can be devised which work, regardless
+of the identity of the processes transmitting data.  Control data must
+be formatted and probably identifiable by prefix codes so that
+unnecessary control information can be left out if desired.  (I am
+thinking specifically of file names.)
+
+It remains to establish a set of format protocols which permit packaging
+of data and identification of control information.  This should be the
+task of the renamed Data Transmission Committee.
+
+       [ This RFC was put into machine readable form for entry ]
+         [ into the online RFC archives by Simone Demmel 5/97 ]
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+                                                                [Page 3]
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