This book is a practical guide to understanding and implementing iptables, the powerful firewall management tool in Linux. It covers network security fundamentals, explains how iptables works, and provides real-world firewall configurations to protect systems from unauthorized access, cyber threats, and data leaks.

Key Topics Covered:-

• Introduction to Network Security – Why firewalls are essential in today’s cybersecurity landscape.

• Understanding iptables & Netfilter – How packets are filtered, chains, tables, and rule processing.

• Writing iptables Rules – Step-by-step guidance on blocking/unblocking traffic, NAT, and connection tracking.

• Advanced Security Configurations – VPN kill-switch setup, DNS security with Stubby, and EMF interference considerations.

• iptables vs. Modern Alternatives – Comparison with nftables and firewalld for future-proof security.

• Troubleshooting & Debugging – Techniques to analyze logs, detect leaks, and optimize performance.

• Appendix - Advanced iptables configurations for Linux and a firewall setup for Android.

This book is written for both beginners and advanced users who want to secure their Linux systems, optimize firewall performance, and understand how attackers exploit misconfigured rules.

A Living Samadhi is not just a memoir — it’s a revelation.

I was born into a life of simplicity and service, growing up between discipline, hardship, and an unseen connection to something far beyond the physical world. From the forests of Lansdowne to the ghostlike shadows of Nagpur, my journey moves through childhood asthma, invisible touches, and a deepening awareness of a force that science still refuses to explain.

This book is my raw, spiritual exploration of electromagnetic-field (EMF) experiences, intuition, awakening, and the mysterious interface between technology and the soul. Blending real-world engineering with the unseen, I share moments where machines malfunctioned without reason, energies shifted without warning, and life itself seemed quietly influenced by forces that don’t carry a name.

But let me be clear:
This is not a conspiracy theory.

This is a spiritual declaration — a reminder that beyond circuits, beyond control, and beyond pain, there exists a presence that protects. In the chaos, God, intuition, discipline, and inner clarity became my only tools in a world that often blurred the line between the real and the unreal.

Inside this journey, you’ll discover:

• First-hand experiences with EMF interference and spiritual resistance

• Techniques to handle anxiety, fatigue, and negative energy — mentally and physically

• Reflections on dreams, intuition, and the bridge between science and mysticism

• The role of prayer, pooja, and willpower in protecting the mind and soul

• A deeply human story of faith, survival, and awakening