bash-utils / ssh tunnel script

This script is useful for establishing stable SSH reverse tunnel connection. I am using this script on my Raspberry PI that uses mobile network connection (behind NAT).

SSH tunnel options

-CfNTR

• C - compression, useful for metered and not too fast connection
• f - background mode (I want to run the script periodicaly by CRON in case when connection breaks)
• N - without command prompt, only port forwarding
• T - Disable pseudo-terminal allocation
• R - Port forwarding

-o ExitOnForwardFailure=yes -o ServerAliveInterval=120 -o KeepAlive=yes

Most interesting option here is KeepAlive. Without this option I could not connect to Raspberry Pi after several minutes - connection was hanging up.

With these options I have a solid connection with my Raspberry PI device.