Regardless of the operating system we use, surfing the internet always carries a riskin the same way that it has a large amount of very valuable information, it is plagued with malicious programs that can put our equipment and personal information at risk.
For this reason, use security programs known as which provide various levels of protection against harmful files, preventing problems on our computer.
In order to get the most out of these essential programs, it is necessary to know how to handle and configure themand if you want to know everything you need about firewalls on your computer linux, continue reading.
What is a firewall and what are the levels of these software?
A firewall is digital security software that It is responsible for monitoring incoming and outgoing network traffic. and that, through a series of configurations, it decides which elements found in network traffic are safe and which must be blocked to prevent threats.
They have served as the premier network security barrier for over 25 years, and have a scale of levels that offer more or less protection, depending on the level you are at. The level of protection of firewalls is divided into four levels.
List of the best firewalls to use in Linux and keep your documents and projects 100% secure
Linux has a wide variety of security implements to protect your network traffic. Sinceto security software with a graphical interfaceand these are the best firewalls available for linux at each security level.
Go for it:
First Level: Netfilter
Netfilter is a framework built directly into the Linux kernel and enables the operating system to perform automatic network management actions such as traffic monitoring, address translation, sniffing, and data packet filtering. It must be taken into account that the user’s interaction with Netfilter is limited to providing the API that authorizes the use of other software as an intermediary, so Netfilter works completely independently of the user.
Second level: Iptables / Nftables
iptables functions as a controller for filtering protocols netfilter that can be activated from command terminal. However, the Iptables control tags have a complex syntax and only allow one action to be performed per command line.
A graphic example of a command line to modify Netfilter parameters is this:
- iptables -t nat -A PREROUTING -p tcp –dport 80 -j DNAT –to-destination 192.167.1.1:80
Fortunately, Iptables is quickly being displaced by Nftables as a firewall controller, since it does the same job as Iptables in a more fluid way and with a more compact and friendly syntax.
Using this improved tool, the iptables command would be translated to Nftables like this:
- nft add rule ip nat PREROUTING tcp dport 80 counter dnat to 192.167.1.1:80
Level 2.5: Non-graphical front-ends
They are optional use tools that work on top of Nftables and allow the user more control over the configuration of firewall protocols on a Linux computer:
- UFW: is a tool created by Canonical for use on home computers. It was developed for Ubuntu and is included in all its versions.
- APF: is software specially designed for server protection. Its setup is very informative and is designed to guide the user through the setup process.
- Shorewall: it is a high-level configuration tool for Netfilter. The amount of settings and options available make it a complex software to use.
- Uruk: is a small and simple script that works as a configuration tool for Iptables. Offers a wide variety of parameters to control network traffic and data packet permissions
- IP Fire: It is one of the most secure and popular firewalls among companies around the world. It is built to work with Netfilter and can be set to work as a firewall, proxy server or VPN gateway.
Third level: Graphical front-ends
The tools with graphical interface They are preferred by users who are used to other operating systems, as they allow them to adjust their firewall settings in a familiar way.
They can be used on top of Iptables/Nftables, or in conjunction with programs like APF:
- GUFW: is the official graphical interface of the UFW, and one of the most popular security software for Linux. It is natively included in many distributions and comes preconfigured with a number of settings for specific applications and services that can be adjusted to suit the user.
- Douane: It is among the most popular firewalls for novice users due to the simplicity of its graphical interface. It offers few configuration options, but it is a more than viable option to keep your operating system safe.
- OpenSnitch: is a port of the popular LittleSnitch for Mac OS, modified in Python and adapted for Linux distributions. It offers full control over the devices that connect to the local network, and its community keeps it in constant development.
- Fire Starter: It has an internal network traffic monitoring tool that allows real-time monitoring of local network data, it has a simple graphical interface with a wide range of options to configure security
- Guarddog: is a firewall generation and management tool, aimed at the novice user and those who don’t want to deal with complicated Iptables parameters. It offers a graphical interface and a very complete range of security settings
These are the best security tools to complement your Linux firewall
Even though the firewalls of linux offer broad security coverage of network traffic, many times it is necessary to complement said security with an external tool to cover all possible gaps.
These are the best security plugins for Linux firewalls that will keep your computer completely safe:
Lynis
It is a security auditing tool that It is available in the most popular distributions, such as Y . Its function is to carry out complete analyzes of the software installed on the computer to detect security flaws that need to be corrected.
rkhunter
It is an executable application through command lines that is responsible for verifying the presence of rootkits on our computer, as well as Trojans, malware, backdoors and malicious scripts. It is quite meticulous despite the fact that it can only be executed manually.
DML
are the initials of Linux Malware Detectoralso know as Maldet. It is especially useful when analyze websites that represent a potential threatas well as in the detection of backdoors, blackmailers and other files of a malicious nature.
OpenVAS
It is a framework that It works as a free-use vulnerability scanner for the detection and correction of security flaws in the system. It comes installed by default in distributions such as Kali Linux and works both through the command terminal and through its web interface.
Tiger
It is a tool with an easily expandable modular interface that works as a security auditor and as an intrusion detector. It is available for multiple platforms UNIX and is distributed free of charge under a license GPL.
Learn about the most secure and confidential Linux distributions that you can install on your computer
We now present to you the distributions with better security optionsperfect for installing on your Linux computer and keeping your files and projects safe from any malicious threat.
Let’s see:
Whonix
It is a Linux distribution focused on the security of user data, through the protection, privacy Y anonymity on the internett. It is made up of two images called virtual machines, which consist of a private workstation and a communication channel that works under the network. Tor.
privatix
It is a portable distribution that can be installed on a CD/DVD or configured on a bootable USB stick. It is based on Debian GNU/Linux and designed for the edition and transport of sensitive information, encryption of communications and private browsing through the Tor.
Tails
It is based on Debian and designed to preserve anonymity while browsing by filtering all network connections through Tor. Like Privatix, it is designed to be run via USB or installed via CD.
Ipredia OS
It is an operating system that focuses on communication privacy through data encryption, and in the browsing anonymity by encrypting network data. It is compatible with a variety of applications such as emails, torrents and IRC, among many others
kali linux
It is entirely designed for the purpose of performing various security tasks such as computer security auditas well as penetration testing and ethical hacking. It is one of the most secure distributions available for Linux to date.
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