Fix "No free Lispms"

[larsbrinkhoff]

Make it easy to run a PDP-10 and a CADR emulator together, talking over Chaosnet. This will involve @bictorv's cbridge, and usim, currently maintained by @ams.

Maybe it would be nice to have everything start automatically with something like ./start chaosnet cadr, where chaosnet starts a local cbridge, and cadr starts usim.

It's unclear whether to add cbridge and usim as subrepositories like other emulators, or to have them outside the ITS tree.

[larsbrinkhoff]

FYI @emooreatx

[larsbrinkhoff]

This should make configuration changes on the ITS and CADR sides to have file serving working.

[larsbrinkhoff]

I believe there is an agreement that the "global Chaosnet" project has reserved subnet 254 (decimal) for a local network, so that's probably what should be used.

[larsbrinkhoff]

Information about configuring Chaosnet here: https://chaosnet.net/local

[bictorv]

Someone should teach ITS to send FINGER requests by broadcast (BRD packets). This would find more LISPMs, both used and free.

[larsbrinkhoff]

./start chaosnet now works out of the box, setting up a private 376 subnet.

[bictorv]

Someone should teach ITS to send FINGER requests by broadcast (BRD packets). This would find more LISPMs, both used and free.

See #2290 :-)