ufw

ufw is a firewall configuration for Linux based operating systems. The main purpose of ufw is to make the management of firewall an easy task. Expanded as Uncomplicated Firewall, ufw was created to manage the netfilter firewall. Its function can be gained through a command and by using iptables since ufw is a front end to them. Through ufw, IPv4 or IPv6 based firewalls can be created.  It provides a framework for managing netfilter and also a command-line interface for controlling the firewall. Install and configure UFW Firewall will be discussed in Debian/Ubuntu.