After much fighting, and apparently being blocked by one of my ISP’s, I got back onto HECnet! Â Even better I was able to verify operation with HECnetNT!
Like last time I was able to bind Pathworks 32’s DECnet onto a MS Loopback adapter, and then use the bridge to connect onto that loopback to a local Linux bridge (which is also hosting a virtual SIMH VAX instance).
The big problems I ran into is that I originally had setup SIMH to use a tap interface, and connect into a bridge, as mentioned onÂ theÂ raspberrypi.org forums, however the HECnet bridge program seems to have difficulty injecting packets onto the bridge interface. Â I suspect the ‘correct’ thing to do is to remove libpcap from the bridge, and re-write it to be a tuntap client. Â There is enough examples, I should be able to do this, but I just wanted the thing to work, so I didn’t want to tackle this just yet.
Instead I had SIMH attach to the Linux lo adapter (typically where 127.0.0.1 lives), and the HECnet bridge program, and success! Â Even better the interface has been up now over 12 hours since it was brought online.
Well wasn’t that fun?
Want to learn more about HECnet? Â simply check it out! Â But as the short order goes it’s a hobbyist DECnet of machines spread out across the globe running the ancient DECnet protocol on various legacy style systems.