ufw

Uncomplicated Firewall. Frontend for iptables aiming to make configuration of a firewall easier. More information: https://wiki.ubuntu.com/UncomplicatedFirewall.

ufw enable

ufw disable

ufw status numbered

ufw allow 5432 comment "Service"

ufw allow proto tcp from 192.168.0.4 to any port 22

ufw deny 80

ufw deny proto udp from any to any port 8412:8500

ufw delete rule_number