Month: August 2018

How to test network speed using two Linux machines?

Introduction This guide will show you how you can perform a network speed test using two Linux machines. It will show you the actual network bandwidth between two points in your network. We will connect a Linux machine at each point in you network and generate traffic between them. We can use simple laptops, desktops

Tcpdump command examples.

Introduction This post is about tcpdump – packet analyzer that comes preinstalled with any modern Linux distribution. tcpdump allows us to capture packets and either display them in real time or save them to a file for later analysis. We will look at several examples of using tcpdump to learn which options it has and

Introduction to iptables

Introduction In this tutorial we will learn how to configure iptables which is a built-in Linux firewall. I will use Ubuntu 18.04 for demo, but you can use any other Linux distro. Before we get into actual configuration we will learn some theory behind iptables. iptables allows us to filter packets based on IP addresses,