ufw

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

• Enable ufw:
  ufw enable
• Disable ufw:
  ufw disable
• Show ufw rules, along with their numbers:
  ufw status numbered
• Allow incoming traffic on port 5432 on this host with a comment identifying the service:
  ufw allow {{5432}} comment "{{Service}}"
• Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22:
  ufw allow proto {{tcp}} from {{192.168.0.4}} to {{any}} port {{22}}
• Deny traffic on port 80 on this host:
  ufw deny {{80}}
• Deny all UDP traffic to ports in range 8412:8500:
  ufw deny proto {{udp}} from {{any}} to {{any}} port {{8412:8500}}
• Delete a particular rule. The rule number can be retrieved from the ufw status numbered command:
  ufw delete {{rule_number}}