RFC 68 (rfc68) - Page 2 of 2

Comments on Memory Allocation Control Commands: CEASE, ALL, GVB, RET, and RFNM

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Network Working Group                                           M. Elie
Request for Comments #68                                        31 August 70
                                                                UCLA

its text but rather up to the NCP: the user process must as much as
possible act as if it was talking to some other local process.  So a
third kind of RFNM sent by the NCP could be:

            NAK(REPEAT)

Repetition would also be initiated in case of no reply.

Thus we see that it seems worthwhile to make these slight
modifications which would permit to use between the sending host and
the receiving host a very simple point-to-point transmission procedure
which would insure control of the data transmitted from end-to-end.

It could also replace the memory allocation mechanism: ACK (CONTINUE)
would only be sent if space was available for a new message on this
connection and/or ACK (CEASE) would be sent if no more space was
available; it corresponds to the WABT of classic transmission
procedures [USAS69]; transmission could be resumed by an ACK
(CONTINUE) or a RESUME from the receiving end.  The user process is
not mixed at all with this memory allocation which is a function of
the system (or NCP): it only sees a varying global transmission speed
of its data on a connection.  The imp programs take care of the
routing of the data according to the distributed nature of the
network, and neither the user nor the system (or NCP) is concerned
with it.  Other improvements to the protocol may be found after
experiencing it.

Finally note that this solution does not immobilize the imp memory any
longer than the actual solution, because it is not the imp which has
to repeat a message, but the sending host.


______________________________________________

DELO 69 DELOCHE G.  Implementation of the Host-Host Software
        Procedures in GORDO Network Working Group RFC #11 Aug 1969

USAS 69 Proposed USA standard data communication control procedures
        for USASCII CACM Vol. 12 NB 3 March 1969 PB 166-178


       [ This RFC was put into machine readable form for entry ]
        [ into the online RFC archives by Kai Henningsen 6/97 ]
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