Re: Text based synchronous communication tool for Linux?

On Sun, 8 Dec 2024 18:36:35 -0000 (UTC)
cross@spitfire.i.gajendra.net (Dan Cross) wibbled:

works is brittle and doesn't work well over the modern Internet.
In particular, it is de-facto limited to IPv4 and doesn't
play well with firewalls: it involves sending the contents of a
`sockaddr_in` across the network, and using that to set up a
(direct) TCP connection between processes.  One could imagine

Huh? I don't get how that works. You need a connection in the first place to
send anything unless you use a broadcast UDP address. You can't just
automagically set up a connection without the OS network layer playing its
part.