[ih] History from 1960s to 2025

[the keyboard of geoff goodfellow]

otoh, "subnet" or "sub network" was also used with respect those of us with
hosts connected with 1822 to IMP's with ARPANET encryption devices [
https://en.wikipedia.org/wiki/ARPANET_encryption_devices] (e.g. PLI's) with
an associated piece of GFE (Government Furnished Equipment) that allowed us
to securely communicate with one another depending on what GFI (Government
Furnished Information) they were keyed with.  this facilitated multiple
instances of these "secured subnets" to simultaneously exist on/via the
ARPANET.

g

On Thu, Jan 1, 2026 at 2:26 AM Lars Brinkhoff via Internet-history <
internet-history at elists.isoc.org> wrote:

> Jack Haverty wrote:
> > For anyone interested in the history, and/or in watching, or doing,
> > historical reconstructions:
> > https://obsolescence.dev/arpanet_home.html
> > Much more to be done.  You probably could help.
>
> I'm involved.  I'd like to say one thing we have observed running this
> ARPANET reconstruction is how resilient and self organizing the IMP
> subnet[*] is.  Of course, this is how BBN designed it and it has been
> described in the literature and on this mailing list, but it's still
> impressive to see in real life.  Well done IMP team!  This is part of
> why we have embarked on this project, to allow pepole to not only read
> about but also experience the feeling of using the technology.
>
> [*] As many here will know, the term "subnet" or "sub network" was used
> to refer to the IMP network; i.e. the stratum of the ARPANET providing a
> network service to the hosts, minus the hosts themselves. This is
> different from what subnet means today.
> --
> Internet-history mailing list
> Internet-history at elists.isoc.org
> https://elists.isoc.org/mailman/listinfo/internet-history
> -
>
>

-- 
Geoff.Goodfellow at iconia.com
living as The Truth is True