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Tecmint: Linux Howtos, Tutorials & Guides
  • Learn Linux
  • Linux Distros
    • Linux Distros for Beginners
    • Linux Distros for Experts
    • New Linux Distros
    • Linux Server Distros
    • Secure Linux Distros
    • CentOS Alternatives
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    • Debian Distributions
    • Ubuntu Distributions
    • Arch Linux Distros
    • Rolling Linux Distros
    • KDE Linux Distros
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    • Linux Distros for Kids
    • Linux Distributions for Students
    • Linux Distros for Windows
  • Commands
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Firewalls

Install and Configure Firewalld in CentOS and Ubuntu

How to Install, Configure and Use Firewalld in CentOS and Ubuntu

Firewalld (firewall daemon) is an alternative to the iptables service, for dynamically managing a system’s firewall with support for network

Install and Configure CSF in CentOS and Ubuntu

Install and Configure ConfigServer Security & Firewall (CSF) in Linux

If you look at IT-related job postings anywhere, you will notice a steady demand for security pros. This does not

Setup UFW Firewall on Ubuntu and Debian

How to Setup UFW Firewall on Ubuntu and Debian

A correctly functioning firewall is the most crucial part of the complete Linux system security. By default, Debian and Ubuntu

Fix “firewall-cmd: command not found” Error

How to Fix “firewall-cmd: command not found” Error in RHEL/CentOS 7

firewall-cmd is a command line front-end for firewalld (firewalld daemon), a dynamic firewall management tool with D-Bus interface. It supports

Configure pfBlockerNg for DNS Black Listing in pfSense

Install and Configure pfBlockerNg for DNS Black Listing in pfSense Firewall

In an earlier article the installation of a powerful FreeBSD based firewall solution known as pfSense was discussed. pfSense, as

Install pfSense Firewall

Installation and Configuration of pfSense 2.4.4 Firewall Router

The Internet is a scary place these days. Almost daily, a new zero day, security breach, or ransomware occurs leaving

25 IPtables Firewall Rules for Linux

25 Useful IPtable Firewall Rules Every Linux Administrator Should Know

Managing network traffic is one of the toughest jobs a system administrators has to deal with. He must configure the

Block SSH and FTP Access Using IPtables/FirewallD

How to Block SSH and FTP Access to Specific IP and Network Range in Linux

Typically we all use SSH and FTP services often to access the remote servers and virtual private servers. As a

Linux Firewall Iptables Interview Questions

Nishita Agarwal Shares Her Interview Experience on Linux ‘iptables’ Firewall

Nishita Agarwal, a frequent Tecmint Visitor shared her experience (Question and Answer) with us regarding the job interview she had

Control Network Traffic with FirewallD and Iptables

RHCSA Series: Firewall Essentials and Network Traffic Control Using FirewallD and Iptables – Part 11

In simple words, a firewall is a security system that controls the incoming and outgoing traffic in a network based

Useful Firewalld Rules to Manage Linux Firewall

Useful ‘FirewallD’ Rules to Configure and Manage Firewall in Linux

Firewalld provides a way to configure dynamic firewall rules in Linux that can be applied instantly, without the need of

Setup Failover Load Balancer in PFSense

How to Setup Failover and Load Balancing in PFSense

Failover is a type of backup operational mode in which the operations of a system components such as network are

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Linux Commands and Tools

Rename – A Command Line Tool For Renaming Multiple Files in Linux

How to Set and Unset Local, User and System Wide Environment Variables in Linux

8 Linux Commands to Diagnose Hard Drive Issues in Linux

12 Practical Examples of Linux Grep Command

How to Encrypt and Decrypt Files and Directories Using Tar and OpenSSL

How to Find Linux OS Name and Kernel Version You Are Running

Linux Server Monitoring Tools

How to Install and Configure Zabbix Agents on Remote Linux – Part 3

How to Do Security Auditing of Linux System Using Lynis Tool

CBM – Shows Network Bandwidth in Ubuntu

How to Install Icinga2 Monitoring Tool on OpenSUSE

whowatch – Monitor Linux Users and Processes in Real Time

How to Install Nagios Core in Rocky LInux and AlmaLinux

Learn Linux Tricks & Tips

How to Create a Shared Directory for All Users in Linux

Use ‘pushd’ and ‘popd’ for Efficient Filesystem Navigation in Linux

How to Set Limits on User Running Processes in Linux

Understanding Shell Commands Easily Using “Explain Shell” Script in Linux

How to Find a Specific String or Word in Files and Directories

12 Useful Commands For Filtering Text for Effective File Operations in Linux

Best Linux Tools

11 Best Free and Low-Cost SSL Certificate Authorities

Top 5 Open-Source OCR Tools for Linux in 2025

10 Top Open Source Artificial Intelligence Tools for Linux

5 Best Open-Source eLearning Platforms for Linux in 2024

11 Best Open Source Note-Taking Apps for Linux

3 Best Document Collaboration Platforms for Linux in 2024

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