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Sahan-Chathumina-25/README.md
Sahan Chathumina — Cybersecurity Portfolio Banner
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About Me

About Me — Cybersecurity, Networking, Linux, Full Stack Development

I'm Sahan Chathumina, a cybersecurity and network engineering student focused on building practical experience across network security, Linux administration, system administration and web development.

My main technical interests include cybersecurity, network infrastructure, ethical hacking, Linux server administration, network troubleshooting and secure system configuration.

I enjoy building and testing practical lab environments rather than learning only through theory. My work includes networking, DNS, DHCP, firewalls, SSH, Apache, Linux hardening, security testing and network analysis.

Alongside infrastructure and security, I'm developing my Full Stack Development skills, with WordPress as my main focus, supported by technologies such as HTML, CSS, JavaScript, PHP and MySQL.

I'm continuously learning, experimenting with new technologies and turning what I learn into practical projects and labs. My long-term goal is to build strong expertise across cybersecurity, networking, systems and modern web development.

BUILD · LEARN · SECURE

Who Am I

Terminal interface showing identity, stack, focus, and status

Skill Overview

Skill overview — Cybersecurity, Networking, Linux, Full Stack Development

Skills & Technologies

Cybersecurity

Ethical Hacking Network Security Vulnerability Assessment Security Hardening OSINT CTF Web Security Digital Forensics

Networking

TCP/IP DNS DHCP HTTP/HTTPS Routing & Switching VLAN Subnetting Firewalls VPN Cisco Networking

Linux & Systems

Linux CentOS Rocky Linux SSH Apache BIND DNS firewalld systemd Bash Server Hardening SELinux Auditd

Full Stack Development

WordPress HTML/CSS JavaScript PHP MySQL Python Bash

Tools

Git GitHub Wireshark Nmap Metasploit Burp Suite VMware

Network Architecture

Network architecture — Internet, Firewall, HAProxy, Web Servers, Application, Database with animated traffic flow

Featured Projects

PROJECT 01

Network Security Lab

Hands-on environment for practicing network security, Linux administration, DNS, DHCP, and server hardening.

Linux · Networking · DNS · DHCP · Bash

In Progress

PROJECT 02

Linux Server Hardening

Server hardening lab covering SSH security, firewall rules, SELinux, audit logging, and system monitoring.

Linux · SSH · firewalld · SELinux · Auditd

In Progress

PROJECT 03

DNS & DHCP Lab

Configured BIND DNS and ISC DHCP servers on CentOS with zone transfers and dynamic updates.

Linux · BIND · DHCP · CentOS · Networking

Completed

PROJECT 04

Python Security Scripts

Collection of Python scripts for network scanning, port detection, and security automation tasks.

Python · Networking · Security

In Progress

PROJECT 05

Firewall Configuration Lab

Practicing firewall rules with firewalld, iptables, and network segmentation scenarios.

Linux · firewalld · Networking · Security

Learning

PROJECT 06

Web Application Security Lab

Hands-on practice with common web vulnerabilities in a controlled lab environment.

Web Security · HTTP · Burp Suite

Learning

Cybersecurity Lab

Cybersecurity CTF lab cards with difficulty bars and skill indicators

Linux Labs

Linux lab dashboard with status indicators and technology labels

Networking Labs

Networking labs — Routing, Services, Security, Troubleshooting

Certifications & Courses

Certification timeline — CCNA 3 modules, Red Hat, Diploma in English

Education

  • BSc (Hons) in Ethical Hacking & Network Security — University In Progress (2024 - Present)
  • Higher National Diploma in Network Engineering — Institute of Network Engineering In Progress (2023 - Present)
  • Diploma in English — Academy - English in Seven Boxes Completed (2025)

Currently Learning

● ACTIVE

  • Cybersecurity Fundamentals
  • Network Security
  • Linux System Administration
  • Ethical Hacking
  • CTF Challenges
  • Python for Security Automation
  • Cloud & Infrastructure Security

GitHub Statistics

GitHub Stats — Sahan Chathumina Top Languages — Sahan Chathumina

Connect With Me

GitHub

Footer

Footer — BUILD · LEARN · SECURE

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