mosh to connect to the remote server, once the session starts,
mosh was built for the common, but less apocalyptic scenario of remote a session connecting through a cellular data link, before 3G was even a thing.
mosh man page:
mosh (mobile shell) is a remote terminal application that
supports intermittent connectivity, allows roaming, and provides
speculative local echo and line editing of user keystrokes.
Compared with ssh, mosh is more robust — its connections stay up
across sleeps and changes in the client's IP address — and more
responsive, because the protocol is tolerant of packet loss and the
client can echo most keystrokes immediately, without waiting for a
mosh uses ssh to establish a connection to the remote host and
authen‐ ticate with existing means (e.g., public-key authentication
or a pass‐ word). mosh executes the unprivileged mosh-server helper
program on the server, then closes the SSH connection and starts
the mosh-client, which establishes a long-lived datagram connection
Back in those days, if you used your laptop to log in to your ssh server, for example in a commuter train, using a CDMA "pc-card" modem on your blindingly fast compaq armada (omg pentium!), or using a serial cable to hook up that palm VII thingy that had some sort of data service; you would have your session disconnected every time you switched from one radio cell to the next, which in a commuter train could be every 3 to 5 minutes.
That would be an equivalent scenario to the old Soviet Union raining down plutonium along the train's track, from the connection's point of view...
mosh to the rescue. It uses ssh to authenticate, but the rest of the session is handled by the mosh tunnel, which was specifically designed for session resilience on flaky links.
From a user's perspective, nowdays it's imperceptible. I still use it to ssh, er... mosh from my Android device using
termux even though the links on 4G don't have this issue anymore.
Another frequent use case was ssh connections through flaky modem links over POTS, that would drop the session if your sister decided that she wanted to call her boyfriend and picked up the other FIXED phone in the house, even though you warned her that you'd be downloading U2's new album in MP3 format from a shady WaReZ site.
So if you would like to use this, install mosh using your distro's package manager on both server and client (no root needed on either, it will do a userland install if it can't get root, handy for Android devices) and then do:
terminus:~>> mosh trantor.mydoman.tld tmux
Last login: Wed Apr 4 21:27:38 2018 from XX.XXX.XXX.XXX