[ih] invention of multicast addressing
dcrocker at gmail.com
Fri May 7 11:21:27 PDT 2010
Hmmm. I have a vague recollection of hearing that the Irvine Ring had some sort
of multicast-ish capability. Its addressing was based on process table lookup,
rather than physical interface labels, so this seems a plausible memory. I note
that you copied Dave.
That, of course, would pre-date the Arpanet/Internet exploration of multicasting
by a few years.
On 5/7/2010 10:20 AM, Craig Partridge wrote:
> Hi folks:
> I'm trying to nail down when the concept of a "multicast address" came about
> (just a little citation in a larger paper I'm writing).
> In 1976 in the original Ethernet paper, there was unicast and broadcast.
> In 1978, in their survey of local networks, Clark, Pogran and Reed mention
> in passing that Mockapetris is playing around with bit wildcarding that
> permits multiple addressees using one address.
> In the 1980 Ethernet specification there are Ethernet multicast addresses as we
> know them today.
> Digging a bit deeper from references in later papers, it appears that
> Mockapetris, Lyle and Farber may have proposed a form of multicasting in 1977
> (IFIP Congress paper of August 1977 that I don't have).
> That suggests that someone saw the Mockapetris-Lyle-Farber idea, simplified it
> and put it into the 1980 Ethernet standard (where it sat unused for several
> years...). But I can find no trail... Anyone got insights?
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