[ih] ARPANET uncontrolled packets (was: GOSIP & compliance)

[Stephen Casner]

On Sun, 3 Apr 2022, Jack Haverty via Internet-history wrote:

> UDP defined a "datagram mode" somewhat analogous to the ARPANET's
> "uncontrolled packets" ("type 3" IIRC).  The ARPANET operators at BBN were
> staunchly opposed to allowing such packets to be used, for fear that they
> would seriously disrupt the normal "virtual circuit" mechanisms internal to
> the ARPANET structure.  So "datagrams" on the ARPANET, while possible, were
> only rarely permitted, for specific experiments, between specific Hosts.

I have often seen/heard the ARPANET uncontrolled packets referenced as
"type 3", e.g. by our late Danny Cohen.  But they were actually "type
0, subtype 3".  I remember implementing that for packet voice.  Check
BBN 1822 pp. 3-14 and 3-35.

                                                        -- Steve