ufw

Uncomplicated firewall.

A program for managing a netfilter firewall. It runs on top of iptables and provides an easy-to-use interface. With ufw, you can set up rules based on services or ports.

Usage

Check firewall status.

sudo ufw status

Allow a service or port.

sudo ufw allow ssh
sudo ufw allow 22

Enable firewall.

sudo ufw enable

Subcommands

• allow - Enables the connection to the provided service.
• deny - It black-holes the requests. Doesn’t respond. Used most of the time.
• reject - Notifies that the port is closed.

Limitations

[!WARNING] Be careful when using ufw and Docker. For more information check chaifeng/ufw-docker.

Resources

• Uncomplicated Firewall #media/article