DECnet over "dialup"
If the PyDecnet thing is the TCP listener and ignores the
source IP address and then just verifies it's a DECnet
packet with the right area/node id (somekind of new filter
function), I think we have enough security to get started.
Ham radio...
You can put a DECnet packet in a KISS frame and you have
a PTP link with callsign identifications if you want. A
"grapes wd4dsy modem" would make 56Kbit or 112Kbit on
432 or 1296.
-P