Network visibility

Owen DeLong owen at
Thu Oct 21 15:43:13 UTC 2021

> On Oct 20, 2021, at 14:19 , bzs at wrote:
> On October 20, 2021 at 16:08 mel at (Mel Beckman) wrote:
>> Mark,
>> Before 1983, the ARPANET wasn’t an internet, let alone The Internet. Each
>> ARPANET connection required a host-specific interface (the “IMP”) and simplex
>> Network Control Protocol (NCP). NCP used users' email addresses, and routing
>> had to be specified in advance within each NCP message.

I think you mean before 1982.

TCP/IP was deployed starting in 1982. NCP was deprecated (removed from the
ARPANET) January 1, 1983, but TCP/IP was implemented (and deployed) prior to that.

> Then again there were IMPs fitted to various systems like TOPS-10,
> ITS, Vax/BSD Unix, IBM370, etc.
> So was that really all that different from ethernet vs, oh, wi-fi or
> fiber today, you needed an adapter?

It really wasn’t, but even if you just want to count from TCP/IP forward, 1983
isn’t the correct date. 1983 was when we turned off NCP. It wasn’t when we
turned on TCP/IP. The turn on of TCP/IP occurred over several months, so there’s
no particular date that can be assigned to it.


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