# 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
$
cheat.sh
tldr