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Start  the SSH tunnel

autossh is a program to start a copy of ssh and monitor it, restarting it
as necessary should it die or stop passing traffic.

Once started, you can move the program to the background.

# autossh -M 9876 -o ServerAliveInterval=60 -o Tunnel=ethernet \
  -t -f -w 0:0 -t -i <path-to-private-key> -NCT sshuser@<public-AWS-instance-IP>

-M defines the monitoring port autossh uses to monitor the connection
-o  sets SSH options (bridged tunnel and keepalive)
-i   denotes the path to the private key matching the public key copied to the host system.
-w denotes the number of the local and remote tunnel interfaces for tunnel device forwarding
     (e.g., the 0 in interface tap0). 
-N denotes that no remote command should be executed
-T disables pseudo-terminal allocation
-C requests data compression
-f requests that the command go into the background before command execution