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IPtables – How to block and unblock IP Addresses in Linux

Updated 14th December 2023

Not long ago, I noticed some strange activity on a server I manage. The server, running Ubuntu 22.04, was receiving high volumes of traffic from a single IP Address. After some investigation, I decided the activity resembled that of web scrapping, so I decided to block the IP Address. Iptables or ufw I hear you

What is the Lexing stage in PHP

Updated 10th December 2023

Lexing is a phase the PHP interpreter undergoes while interpreting the source code written. Lexing, is the first of four overall steps performed by the PHP interpreter. Steps in the PHP Interpreter The PHP interpreter undergoes a total of four steps before executing the code written. What is Lexing in PHP Lexical analysis, also known

How to set up SSH on Raspberry Pi

Updated 16th August 2022

In this post, I am going to show you how to set up SSH on a Raspberry Pi. Step 1: Raspberry Pi config menu First, open a new terminal and execute the command below to open the Raspberry Pi config menu. sudo rasps-config  Select “Interfacing Options” and press ENTER. Then select “SSH” and press ENTER.