firewall

How to Troubleshoot `SSH Connection Issues` & Improve SSH Security

2023-02-18
Networking, SSH

TLDR; This blog covers common SSH issues that power-users and advanced users may encounter. It discusses troubleshooting tips for connectivity, authentication, configuration, security, and miscellaneous issues. Some of the most important topics covered include verifying the server is running and reachable, troubleshooting SSH authentication failures, checking SSH key and authorized_keys… Read More »How to Troubleshoot SSH Connection Issues & Improve SSH Security

Troubleshoot `Common Network Issues` with These Linux Commands

2023-02-18
Linux, Networking

TLDR; This article provides a comprehensive guide to troubleshooting common network issues on Linux systems. It covers common issues such as connectivity problems, DNS resolution issues, firewall issues, DHCP issues, slow network speed, and VPN connectivity issues. The article provides techniques for troubleshooting, such as checking network logs and using… Read More »Troubleshoot Common Network Issues with These Linux Commands

Stay Secure with Linux `System Hardening`

2023-03-12
Bash, Linux, Security

Are you tired of constantly worrying about security threats on your Linux system? Look no further! In this comprehensive guide, we’ll go through the best practices for hardening your Linux system and minimizing the risk of a security breach. By the end of this article, you’ll have a solid understanding… Read More »Stay Secure with Linux System Hardening

Monitor Your Network Connections with `Netstat`

2023-03-13
Linux, Mac, Networking, Security, Windows

Netstat (Network Statistics) is a powerful command-line tool that allows you to monitor the state of your network connections, sockets, and routing tables in real-time, which works both in Linux and Windows. It can display important information about network interfaces, active connections, and network statistics. The tool has been around… Read More »Monitor Your Network Connections with Netstat

Protect Your Network with `iptables`

2023-03-13
Bash, Linux, Networking, Security

Iptables is a tool to manage the incoming and outgoing network traffic on a Linux system. This blog post provides a comprehensive overview of iptables, including its basic concepts, use cases, and security considerations. Additionally, this blog post provides tips for using iptables in real-world scenarios and offers a challenge… Read More »Protect Your Network with iptables

Get Started with `Firewall Rules in Ubuntu`

2023-03-12
Bash, Linux, Networking, Security

Introduction to Firewall Rules in Ubuntu Ubuntu is one of the most popular Linux distributions that powers a vast majority of servers, workstations, and even personal computers. One of the key security features of Ubuntu is the firewall, which provides a barrier between the system and the outside world, controlling… Read More »Get Started with Firewall Rules in Ubuntu

Get Started with `Firewalls in RHEL`

2023-03-12
Bash, Linux, Networking, Security

Firewall is a security system that protects the network from unauthorized access. It is a crucial component of the network security system. In Red Hat Enterprise Linux (RHEL), the firewall rules are managed by the firewall-cmd command-line tool. This blog will provide an in-depth guide on how to view and… Read More »Get Started with Firewalls in RHEL

What is a Firewall? Understanding `Firewall Concepts`

2023-03-12
Bash, Networking, Security

Whether you are a network administrator, security professional, or just someone interested in cybersecurity, understanding firewall concepts is essential. A firewall is a crucial component of your network’s security infrastructure that helps protect against unwanted and malicious traffic. What is a Firewall? A firewall is a security system designed to… Read More »What is a Firewall? Understanding Firewall Concepts

The `TCP/IP Model`: Understanding the Fundamentals of the Internet

2023-03-13
Networking

The TCP/IP Model: An Overview At a high level, the TCP/IP model consists of four layers: Each of these layers serves a specific purpose, and they work together to enable communication between computers. Let’s take a closer look at each layer in turn. The Network Interface Layer The Network Interface… Read More »The TCP/IP Model: Understanding the Fundamentals of the Internet

Installing Puppet Agent on a `Windows Server Node`

2023-03-13
Puppet, Windows

Prerequisites Before we dive into the installation process, there are a few prerequisites that must be met: Installation Replace <PUPPET_MASTER_HOSTNAME> with the hostname of your Puppet master. You should see output similar to this: This output indicates that the Puppet agent was able to successfully communicate with the Puppet master… Read More »Installing Puppet Agent on a Windows Server Node