On Fri, Jul 15, 2016 at 10:08:40AM -0400, Mouse wrote:
DECnet might
be totally integrated and awesome, but it's also
proprietary, seldom used,
I think it is only semi-proprietary. I've seen open documentation that
at the time (I don't think I have it handy now) I thought was
sufficient to write an independent implementation, both for Ethernet
and for serial lines.
However, IIRC it also has a fairly small hard limit on the number of
hosts it supports. I don't remember exactly what the limit is;
different memories are handing me 10, 12, and 16 bits as the address
size, but even the highest of those is sufficient for at most a large
corporation. (Maybe it was 6 bits of area number and 10 bits of host
number within each area? I'm sure someone here knows.)
*cough*
2^16 addresses for a large corp these days will just get you some howling
laughter. Depending on what the company does, it might be enough for the
desktops & their support environment, but not even remotely enough for
the datacenters ...
Perhaps if DEC had enlarged the address space
(somewhat a la the
IPv4->IPv6 change) and released open-source implementations, it might
have been a contender. For all I know maybe they've even done that,
but now it's much too late to seriously challenge IP's hegemony.
IP won over OSI *hualp* and whatever else insanity was out there because
it a) works, b) is reasonably simply to implement (yes, I know, a full up,
modern TCP/IP stack is anything but trivial, but the basics are not that
crazy) and comes with a rather low level of designed-in complexity.
Just compare SMTP and the OSI equivalent, X.400 ... yikes.
But the real shining star of DECnet/VMS was not the
protocols, but the
ground-up integration into the OS.
Which in modern UNIX systems is also there for TCP/IP. A modern UNIX type
OS is pretty much unthinkable without a fully integrated TCP/IP stack.
Yes, I'm aware of Coherent and their TCP/IP stack being an option, but even
in the 90s I considered this to be a bad joke.
Kind regards,
Alex.
--
"Opportunity is missed by most people because it is dressed in overalls and
looks like work." -- Thomas A. Edison