I was the person who wrote the IMP code and, on January 1, "pulled the switch" to disable port 0 (NCP) on the ARPANET IMP interfaces. I had also included the abiltity to override the switch on a port-by-port basis, and we had a procedure in place well prior to the cutover for approved exceptions to the no-NCP policy. A good number of hosts made the deadline, although the exception list did grow in the first few days of 1983 as some people realized that they had ignored the cutover for too long, but as I recall the exception list quickly shrank, and by the end of the year there were very few NCP-only hosts left. There was certainly some amount of pain involved, but NCP would have hung around for much longer if the switchover hadn't been enforced.
Cheers,
Andy
On 9/26/06, Bob Braden <braden@xxxxxxx> wrote:
Phillip Hallam-Baker wrote:
*> Or perhaps the lesson should be that planning for the transition is as important as the end state.
Please see RFC 801, "NCP/TCP TRANSITION PLAN" by Jon Postel.
See also RFCs 845 and 846 on the transition progress.
Bob Braden
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