# ufw

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

- Enable `ufw`:

`sudo ufw enable`

- Disable `ufw`:

`sudo ufw disable`

- Show `ufw` rules, along with their numbers:

`sudo ufw status numbered`

- Allow incoming traffic on port 5432 on this host with a comment identifying the service:

`sudo ufw allow 5432 comment "{{Service}}"`

- Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22:

`sudo ufw allow proto tcp from 192.168.0.4 to any port 22`

- Deny traffic on port 80 on this host:

`sudo ufw deny 80`

- Deny all UDP traffic to ports in range 8412:8500:

`sudo 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:

`sudo ufw delete {{rule_number}}`