SSH Tunneling - Deep Understanding

Step 1: SSH Command

            SSH -i ./.ssh/sj03 user@domain.com

Step 2: Add -N to Network Port forward

            SSH -i ./.ssh/sj03 user@domain.com -N

Step 3:  Add  -L if tunnel starts on Local

            SSH -i ./.ssh/sj03 user@domain.com -N -L 8888

Step 4: Add -R if tunnel starts on Remote
         
            SSH -i ./.ssh/sj03 user@domain.com -N -R 80

Step 5: Open local 8510 port and forward to <remote-server-ip-you-want-to-connect> on port 22:

            SSH -i ./.ssh/sj03 user@domain.com -N -L 8510:<remote-server-ip-you-want-to-connect>:22

Step 6: Now, local port is open , connect your server

            SSH -i ./.ssh/sj03 user@localhost -p 8510