What is Blockchain? A Tutorial

Reading Time: 9 minutes
what is blockchain

The idea of blockchain itself may sound complicated, but the premise is simple. Blockchain is a zero-trust, fully decentralized peer-to-peer data storage system that spreads verified information across participants in the chain, referred to as nodes. Blockchain stores this information in blocks that are chained together. As new data arrives, it is recorded into a block. Once a block has been filled with information, it is linked to the previous block. This process allows the data to be bound together in sequential and chronological order. 

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How to Install and Configure Uncomplicated Firewall on Ubuntu 20.04

Reading Time: 7 minutes

Introduction

firewall2-image

Just as regular visitors reach our server every day, so do others with more nefarious intentions. It is simply not reasonable to run an online service without some layer of protection. To protect against some of these attacks, Ubuntu ships with ufw (Uncomplicated Firewall). This is a tool designed to make Ubuntu firewall management as easy and user-friendly as possible. Specifically, ufw provides a cleaner interface for the core firewall tools netfilter and iptables, which, while robust, can be challenging to master.

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An Introduction to Firewalld

Reading Time: 5 minutes

In some ways, firewalld on systemd systems is easier to manage and configure than iptables. There are, for the most part, no long series of chains, jumps, accepts and denies that you need to memorize to get firewalld up and running in a basic configuration. The rules are simple and straightforward, but there is no reason you cannot still have all the power that iptables afforded.

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How to Set Up A Firewall Using Iptables on Ubuntu 16.04

Reading Time: 5 minutesThis guide will walk you through the steps for setting up a firewall using iptables in an Ubuntu VPS server. We’ll show you some common commands for manipulating the firewall, and teach you how to create your own rules. Continue reading “How to Set Up A Firewall Using Iptables on Ubuntu 16.04”

Best Practices for Firewall Rules

Reading Time: 4 minutes

Basic Firewall Rules

In a firewall rule, the action component decides if it will permit or block traffic. It has an action on match feature. For example, if the traffic matches the components of a rule, then it will be permitted to connect to the network. It is essential to consider the potential security risks when modifying a firewall rule to avoid future issues. Following best practices for configuring firewalls can help you maximize the effectiveness of your solution.

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How To Set up Email Filters in cPanel

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