UFW (Uncomplicated Firewall) is a software that provides a user interface for managing the firewall of a Linux operating system. It is a simple and user-friendly tool that helps protect a computer or network server by blocking unwanted network connections.
UFW installation
1. If you have not installed UFW yet we can install it with this command:
sudo apt-get install ufw2. When the installation is ready you can enable UFW with this command:
sudo ufw enableOpening a port
1. You can open a port from the firewall with this command. I'm using port 80 for example.
sudo ufw allow 802. You can also assign a specific protocol to a port, for example: "sudo ufw allow 80/tcp".
3. You can check the firewall rules with this command:
sudo ufw statusClosing a port
1. You can deny ports from the firewall with this command. I'm using port 81 for example.
sudo ufw deny 81Whitelisting IP addresses
You can allow IP addresses from the firewall with this command:
sudo ufw allow from 192.168.1.100*Remember to change the example address to the one you want to allow.
Denying IP addresses
You can block network traffic from a specific IP address using the following command:
sudo ufw deny from 192.168.1.100*Remember to change the example address to the one you want to deny.
Enabling and disabling UFW
You can enable the firewall with this command:
sudo ufw enableYou can disable the firewall with this command:
sudo ufw disable
I hope this guide was helpful and you learned the basics about UFW.
