Ufw
ufw¶
UFW (uncomplicated firewall) is a firewall configuration tool that runs on top of iptables, included by default within Ubuntu distributions. It provides a streamlined interface for configuring common firewall use cases via the command line.
Setting up ufw:
sudo apt install ufw
sudo ufw enable
Checking the service status:
sudo ufw status
Disable the service:
sudo ufw disable
You can also control and block ip addresses ports etc: https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands
Allow comms on a port via tcp:
sudo ufw allow 3306/tcp
Show added rules:
sudo ufw status numbered
Delete a specific rule:
sudo ufw delete 2