autossh: setup
Why? You want to access machine that is behind firewall or otherwise inaccessible. Even if connection has been down.
Example you want to make your home computer accessible from work. Home computer is not accessible, because it doesn’t have public IP.
Run ssh-keygen on home machine
Enter empty pass-phrase
Append contents of ~/.ssh/id_rsa.pub (home) to ~/.ssh/authorized_keys (work)
run (home)
autossh -M echo_port -R forward_port:localhost:22 work_host
where echo_port is random port (>1024) and forward_port that will forwarded to your home machine sshd port (22).
Now you can run from work machine
ssh localhost -p forward_port
If you are getting warning that remote host identification changed, then edit /etc/hosts file on work and add your home computer name to 127.0.0.1
eg
127.0.0.1 localhost home_computer_name
now you should able to connect from work computer to home computer by running
ssh home_computer_name -p forward_port
