Linux Firewall Tutorial | Linux Security - UFW Complete Guide | Linux Firewall Tutorial

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Linux Firewall Tutorial | Linux Security - UFW Complete Guide | Linux Firewall Tutorial

Linux FirewallD is a powerful tool for managing firewall rules on Linux systems. It provides a dynamic and flexible way to configure firewall zones, services, ports, and interfaces. In this blog post, we will show you how to install and use FirewallD on Ubuntu 20.04 LTS.

To install FirewallD, you need to run the following command in a terminal:

sudo apt install firewalld

This will install the FirewallD package and its dependencies. You also need to enable and start the FirewallD service with these commands:

sudo systemctl enable firewalld
sudo systemctl start firewalld

Now you can use the firewall-cmd command to interact with FirewallD. For example, you can list the default zone and its active settings with this command:

sudo firewall-cmd --get-default-zone --list-all

You can also change the default zone or add new zones with different settings. For example, you can create a zone called "public" and allow SSH and HTTP access to it with these commands:

sudo firewall-cmd --new-zone=public --permanent
sudo firewall-cmd --zone=public --add-service=ssh --permanent
sudo firewall-cmd --zone=public --add-service=http --permanent
sudo firewall-cmd --reload

You can also use FirewallD to open or close specific ports or ranges of ports. For example, you can open port 8080 for TCP traffic with this command:

sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
sudo firewall-cmd --reload

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