This means that nobody is able to reach your system, while you can make outgoing requests from any application or service. To do so check the default configuration file of UFW:īy default, UFW is configured to deny all incoming traffic and allow all outgoing traffic. If you're getting started with UFW for the first time, it is a good idea to double-check the default firewall policies. We are going to enable it after making some important changes first. Now that you have the latest version of UFW installed, let’s check its status by using the following command:Īs you can see, UFW is inactive by default. However, you can make sure that you have the latest version of UFW by trying to install it using the following command: UFW comes pre-installed with Ubuntu operating system. Early versions of UFW had been available since Ubuntu 12.04. NOTE: This tutorial is not only applicable to Ubuntu 20.04, but other LTS versions as well.

Basic knowledge of command-line interface (CLI).Ubuntu 20.04 system with root privileges.To configure UFW, you need to have the following things beforehand: You may check an extensive list of features in the official UFW documentation. It supports all the basic firewall rules, various network protocols, logging, and many more features. UFW uses a command-line interface with a small number of simple commands. It is a built-in firewall system for Ubuntu 20.04 that simplifies complicated iptables commands and allows you to create basic firewall configurations more easily.

UFW, also called the Uncomplicated Firewall, is a front-end framework that provides a simple interface for using iptables utility to manage netfilter - a default Linux kernel packet filtering system. Firewall-protected systems are less likely to get infected by harmful information, because they are less exposed to the Internet, as incoming and outgoing traffic is strictly filtered according to the security rules. If you are running a production system, it is vital for you to understand how to configure a firewall. It permits or blocks data packets based on predefined security rules. A firewall is a security system for networks that monitors all incoming and outgoing traffic.

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