How to Set Up and Use a Basic Firewall on Linux

UFW (Uncomplicated Firewall) is a user-friendly front-end for managing iptables firewall rules on Linux systems.

Table of Contents

UFW (Uncomplicated Firewall) is a user-friendly front-end for managing iptables firewall rules on Linux systems. It simplifies the process of configuring and managing a firewall, making it suitable for beginners and advanced users alike. This guide will show you how to set up and use UFW to secure your Linux system.

Using UFW

Step 1: Open Terminal

Open the terminal by pressing Ctrl + Alt + T on your keyboard or by searching for it in the applications menu.

Step 2: Install UFW

UFW is usually installed by default on Ubuntu and its derivatives. If it’s not installed, you can install it using the package manager specific to your distribution:

On Debian/Ubuntu-based systems:

sudo apt update && sudo apt install ufw

On Fedora/RPM-based systems:

sudo dnf update && sudo dnf install ufw

On openSUSE systems:

sudo zypper install ufw

On Arch-based systems:

sudo pacman -Syu && sudo pacman -S ufw

Step 3: Enable UFW

Before enabling UFW, it’s a good idea to ensure that SSH connections are allowed to prevent being locked out of your system. To allow SSH connections, run:

sudo ufw allow ssh

Now, enable UFW by running:

sudo ufw enable

To check the status of UFW, run:

sudo ufw status verbose

Step 4: Configure UFW Rules

You can configure UFW rules to allow or deny traffic based on various criteria, such as port number, protocol, or IP address.

To allow traffic on a specific port, use the following command:

sudo ufw allow [port_number]

For example, to allow HTTP traffic on port 80:

sudo ufw allow 80

To deny traffic on a specific port, use the following command:

sudo ufw deny [port_number]

For example, to deny FTP traffic on port 21:

sudo ufw deny 21

You can also specify the protocol (TCP or UDP) when creating rules:

sudo ufw allow [port_number]/[protocol]

For example, to allow UDP traffic on port 53 (DNS):

sudo ufw allow 53/udp

Step 5: Delete UFW Rules

To delete a UFW rule, use the following command:

sudo ufw delete [rule]

For example, to delete the rule allowing HTTP traffic on port 80:

sudo ufw delete allow 80

Conclusion

UFW is a simple yet powerful tool for managing iptables firewall rules on Linux systems. By setting up and configuring UFW, you can enhance the security of your Linux system by controlling the traffic that enters and leaves your network.

Recent
Sections
Tags
Linux Press Release Ubuntu Update

Please Leave Feedback in the Comments

More to Explore

Why MALIBAL?

In a market saturated with well-known laptop brands, MALIBAL stands out as a unique choice for discerning users.

Read More »

Leave a Reply

What our customers say:

"The MALIBAL Aon S1 ended my search for the Best Linux (or Windows) Daily Driver for me."
Jeremy C.
In fact, since the Aon S1 arrived, I much prefer using it to my MacBook Pro 13-inch.
Jack W. - ZDNET
"MALIBAL is simply put the best kept secret in laptop computers."
Trigrhappy
"Best interaction I've ever had while buying something online."
Dale P.
"The final product is practically a work of art."
Nicholas H.
"The absolute best company I have ever dealt with."
Sean O.
"Best laptop I have ever purchased."
Kevin W.
"My new laptop is the best purchase I've ever made."
Liam H.
"The best computer I have ever owned."
Kent S.
"Easily the best laptop I have ever owned."
Sealaction13
"This is the absolute best laptop I have ever owned."
Derek I.
"This is by far the best laptop I ever bought."
Ludwig H.
"My laptop is by far the best I have ever had or seen."
Nicholas R.
"This is the best custom built laptop I've ever had."
Hal L.
Previous
Next
Copyright © 2004-2022 MALIBAL All Rights Reserved.

Search

Type in a question or keyword below
Search

FAQ

Questions and Answers
Who is MALIBAL?

MALIBAL is an innovative technology company that produces high-performance, custom Windows laptops and Linux laptops for developers and content creators; mobile workstations for engineers, scientists, video editors, 3D modelers, and animators; and mobile servers for enterprise applications.

More

Why MALIBAL?

In a marketplace dominated by large corporations, MALIBAL offers a refreshing alternative that focuses on open-source support, the right to repair, hardware integration in the USA, personalized US-based customer support, and the unique combination of customization and high-performance technology in sleek, user-friendly designs.

More

Are all the parts soldered to the motherboard?

In many modern laptops, especially thin and light models (like Apple’s MacBook Air or Pro, Dell’s XPS 13, or many of Lenovo’s ThinkPad X1 Carbon models), the memory, storage, battery, and wireless module are often soldered directly onto the motherboard.

However, as part of our commitment to the Right to Repair Movement, the memory, storage, battery, and wireless module on all MALIBAL laptops are user-upgradeable or user-replaceable.

Can your laptops be charged or powered via USB-C?

All MALIBAL laptops can be powered via the Thunderbolt 4 port.

How do I track my order after it ships?​
You can view your tracking status via the order details page in your account.
How do I get a quote?

If you need a quote for any reason, e.g., to submit to accounting for approval, before ordering, simply add the laptop(s) you want to purchase to the Cart, then click Checkout, and on the checkout page, click Convert Cart to Quote. We will email you a PDF of the quote with a link to make payment once you are ready to complete the order.

How do I cancel an order?

You may cancel an order any time up until it ships. After it ships, you will not be able to cancel it, but will instead have to use our return policy in order to return the laptop for a refund. To cancel an order, simply open a sales ticket or sales chat and give the representative your order information, and they will cancel the order for you and send you confirmation via email and text.

How do I make a change to my order?

You may make changes to your order up until it ships. To modify an order, simply open a sales ticket or sales chat and give the representative your order information and specify which changes you want to make.

When is my order shipping?

If all parts are in stock, the average build time for laptops is 5-7 business days. This means laptops will ship 5-7 business days after the order is placed. If a component is backordered, it will say which parts are backordered in your order confirmation email.

To see the estimated delivery date of your laptop, please check your order confirmation email for the Estimated Delivery Date. You can also see this information on your My Account > Order Details page. The estimated delivery date is the build time (plus backorder delay, if applicable) plus the shipping time.

Once your laptop ships out, we will email you the tracking information. An adult will need to be at the address to sign for the package when it arrives.