dates from the
days before people realised that a
point-to-point link
is not a network
Well there certainly were non-point-to-point synch implementations
around: DEC DDCMP supports multi-drop links.
I'm coming late into this one, but isn't a Cisco serial link (ie frame relay
or X21) point to point and also multi-drop?
There's an RFC around somewhere that allows for
/31 subnets
for such purposes (.1 and .0 being allowed as the two ends).
No idea if it ever caught on though.
Eep, I'm just getting used to /30, don't complicate things :)
cheers
w