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Install and Use Firewalld in Ubuntu

Install and Use Firewalld in Ubuntu

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How to set up FirewallD the easy way on Ubuntu Server

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Firewalls are an essential tool for protecting your computer or network from unauthorized access and malicious attacks. Firewalld is a firewall management tool that provides a user-friendly interface for managing firewalls on Linux systems. In this article, we will cover everything you need to know to install and use Firewalld in Ubuntu.

What is Firewalld?

Firewalld is a firewall management tool that provides a user-friendly interface for managing firewalls on Linux systems. It is designed to work with the Netfilter framework in the Linux kernel, which is responsible for filtering network traffic. Firewalld uses a zone-based approach to manage firewall rules, where each zone represents a level of trust for network traffic.

Installing Firewalld in Ubuntu

Before we can start using Firewalld, we need to install it on our Ubuntu system. Installing Firewalld is a straightforward process, and we can do it using the apt package manager.

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graph TD; A[Install Firewalld] –> B[Update apt package list]; B –> C[Install Firewalld package];

To install Firewalld, follow these steps:

  1. Open a terminal window by pressing Ctrl+Alt+T.
  2. Update the apt package list by running the following command:

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sudo apt update

  1. Install the Firewalld package by running the following command:

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sudo apt install firewalld

Basic Firewall Configuration with Firewalld

Once we have installed Firewalld, we can start using it to manage our firewall rules. In this section, we will cover some basic firewall configurations using Firewalld.

Enabling Firewalld service

Before we can start using Firewalld, we need to enable its service on our system. To do this, run the following command:

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graph TD; A[Enable Firewalld service] –> B[Start Firewalld service];

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sudo systemctl enable firewalld sudo systemctl start firewalld

Listing Firewalld Zones

Firewalld uses a zone-based approach to manage firewall rules, where each zone represents a level of trust for network traffic. By default, Firewalld comes with several predefined zones that we can use to manage firewall rules.

To list the available Firewalld zones, run the following command:

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graph TD; A[List Firewalld Zones] –> B[List zones command]; B –> C[Output list of available zones];

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Copy codesudo firewall-cmd —get-zones

Setting Default Zone

By default, Firewalld uses the public zone as the default zone for managing firewall rules. We can change the default zone to any other available zone by running the following command:

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graph TD; A[Set Default Zone] –> B[Set default zone command];

 

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sudo firewall-cmd —setdefault-zone=zone-name

Replace zone-name with the name of the zone that you want to set as the default.

Adding Firewall Rules

We can add firewall rules to Firewalld using the firewall-cmd command. The basic syntax for adding a firewall rule is as follows:

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graph TD; A[Add Firewall Rules] –> B[Add rule command];

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sudo firewall-cmd –zone=zone-name –add-rule=rule

Replace zone-name with the name

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