[HECnet] Multinet Tunnel Connections to SG1::

No, you have not misunderstood. You are just not getting the full picture. Yes, the Cisco box will transport the DECnet frames inside something. At the bottom there will be IP, but most likely the DECnet frames are actually sitting inside UDP... So what is the difference from the bridge program, you ask. Well, simple, the bridge program tries to be clever about which frames to send where, but it cannot be clever enough at times, and also there are times when it is forced to send traffic that we might want to limit. The reason is that the bridge is not really a part of the DECnet traffic, but is just relaying packets back and forth, making the two ends of the bridge appear as if they were on the same ethernet segment. The Cisco box, on the other hand, is a DECnet routing node. It sits on the ethernet, and participate fully in the DECnet traffic. Thanks. Now I get it. I didn't know that anyone other than DEC ever made something that could route actual DECnet and therefore did not realise that "actual DECnet router" meant "actual DECnet router" :-) Until now I thought this was something only available in a VMS router node. It would be a fun exercise to turn the bridge into an actual DECnet router. One day, when I have a lot of time I might even think about trying that. Regards Rob