[ih] Overlay networks

[Vint Cerf]

spot on, Barbara!!

v


On Thu, Aug 21, 2025 at 12:30 AM Barbara Denny via Internet-history <
internet-history at elists.isoc.org> wrote:

>
> In 1985 and 1986, SRI performed a few experiments at SAC of the
> Reconstitution Protocol. I think the term overlay network applies to what
> we did to repair partitioned networks.  The overlay network was dynamic in
> the sense if the network repaired itself,  the overlay network disappeared.
> These experiments used Packet Radio networks and the ARPAnet.
> If you haven't heard of these experiments before, they were a lot of fun.
> I got to break ARPAnet links and we had military aircraft involved.
> Excuse any typos/word modifications from my phone. Missed the big one in
> the last message.
> barbara
>
>     On Wednesday, August 20, 2025 at 01:53:46 PM PDT, Brian E Carpenter
> via Internet-history <internet-history at elists.isoc.org> wrote:
>
>  On 21-Aug-25 01:57, Joe Touch via Internet-history wrote:
> ...
>
> > So overlays go back over 20yrs as an active area of investigation before
> the ones you found. Anyone know of earlier that explicitly layered a net on
> a working net? (Vs ones that arguably to this with different layers, as
> with bang-path routing of email in the 1980s)
>
> As you say, the model is recursive. At CERN in the late 1980s we layered
> bridged Ethernet over CERNET (the in-house packet switching network) and
> layered TCP/IP, DECnet, and probably more on top of that. In the early
> 1980s, I personally layered a primitive version of OSI/CLNP directly over
> another rather obscure in-house packet switching network. This was just the
> obvious thing to do.
>
> Regards/Ngā mihi
>     Brian Carpenter
>
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