Routing/forwarding ports on Ubuntu Linux

PORT_FORWARD.md

Route port 80 => 3000

sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3000

Make sure changes are applied

sudo iptables -t nat -L

Make changes persistent (on reboot)

sudo sh -c "iptables-save > /etc/iptables.rules"
sudo apt-get install iptables-persistent

Reference:

• https://o7planning.org/de/11363/redirect-port-80-443-auf-ubuntu-server-mit-iptables