linux ssh tunnel code example

Example 1: port forwarding linux

sudo nano /etc/sysctl.conf
# UNCOMMENT `net.ipv4.ip_forward=1`
#AFTER, EXECUTE THESE COMMANDS
sudo sysctl -p
sudo sysctl --system

Example 2: ssh tunnel port

ssh -L 80:intra.example.com:80 gw.example.com

Example 3: how to make tunnel in linux ubuntu

$ ssh -f -N [email protected] -L 8080: server1.example.com:3000