[HECnet] DECnet et al

[Bob Armstrong]

The term segment is used because each node that runs the 
bridge program does filter packets that should stay local.

  Ah, so the bridge program is not really a bridge (at least not in the way
I use the word).   Usually I think of a bridging two networks as meaning to
copy all traffic from network A to network B and vice versa.   If the box or
program does something smart about deciding which traffic should go where,
then it's a "router" (or at least a "switch").

  How does the bridge program decide what DECnet messages to bridge and what
to drop?

Thanks,
Bob