Iptables is a firewall, installed by default on all official Ubuntu distributions (Ubuntu, Kubuntu, Xubuntu). … Ubuntu comes with ufw – a program for managing the iptables firewall easily.

What firewall does Ubuntu use?

ufw – Uncomplicated Firewall

The default firewall configuration tool for Ubuntu is ufw. Developed to ease iptables firewall configuration, ufw provides a user-friendly way to create an IPv4 or IPv6 host-based firewall.

How do I know if iptables is running Ubuntu?

You can, however, easily check the status of iptables with the command systemctl status iptables. service or maybe just the service iptables status command — depending on your Linux distribution. You can also query iptables with the command iptables -L that will list the active rules.