How to Set Up UFW Firewall on Ubuntu

UFW (Uncomplicated Firewall) is the default firewall tool for Ubuntu. It simplifies iptables configuration with an easy command-line interface.

Install and Enable UFW

sudo apt install ufw
sudo ufw enable

Allow Common Services

sudo ufw allow ssh
sudo ufw allow http
sudo ufw allow https

Check Status

sudo ufw status verbose

Block a Specific IP

sudo ufw deny from 192.168.1.100