Lazy Guy’s Cybersecurity corner

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• Block Chain Material
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• Networking – Vender base infra product, Troubleshooting guide, Case Study
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Useful resource:

• NAT/PAT Study Guide: Static, Dynamic, Port Forwarding, and Troubleshooting Essentials2025-10-17
  As a seasoned networking administrator with extensive experience in IP address conservation and security implementations, I regularly revisit Network Address Translation (NAT) and Port Address Translation (PAT) to address IPv4 exhaustion and firewalling needs. NAT/PAT enables private networks to access the public internet via address mapping, but misconfigurations can lead to connectivity blackholes. This guide… Read more: NAT/PAT Study Guide: Static, Dynamic, Port Forwarding, and Troubleshooting Essentials
• Layer 2 Redundancy Switch: Stacking, VSS, and vPC2025-10-17
  As a seasoned networking administrator with extensive deployments across Cisco Catalyst and Nexus platforms, I frequently review Layer 2 redundancy technologies to optimize high-availability designs. Switch stacking (via StackWise), Virtual Switching System (VSS), and Virtual Port Channel (vPC) enable multi-chassis aggregation, simplifying management while minimizing downtime. These solutions address STP limitations by allowing active-active forwarding… Read more: Layer 2 Redundancy Switch: Stacking, VSS, and vPC
• BGP Quick Summary: Essential Concepts for Network Professionals2025-10-17
  As a seasoned networking administrator with extensive experience in BGP implementations, I recognize that even foundational protocols like BGP demand regular review to navigate complex peering arrangements and policy-driven routing. This guide provides a concise reference for BGP key concepts, tailored for quick reference during design, troubleshooting, or certification efforts. It emphasizes core elements including… Read more: BGP Quick Summary: Essential Concepts for Network Professionals
• OSPF Quick Summary: Essential Concepts for Networking2025-10-17
  As a seasoned networking administrator with extensive experience in OSPF implementations, I recognize that even foundational protocols can require periodic review amid evolving network demands. This guide serves as a concise reference for OSPF key concepts, designed for quick reference during troubleshooting, design, or certification preparation. It focuses on core elements including fundamentals, areas, LSAs,… Read more: OSPF Quick Summary: Essential Concepts for Networking
• Speedup Script backup: Multi-Threaded Backups to Slash Runtime with Python and Paramiko2025-10-16
  Auditing your Catalyst 1300 fleet one switch at a time? If your IP list is stacking up and those sequential SSH sessions are turning a quick job into an all-afternoon affair, it’s time to parallelize. Building on our C1300-tailored audit script (full configs, interface status, versions, and clocks via datadump), this post unleashes multi-threading with… Read more: Speedup Script backup: Multi-Threaded Backups to Slash Runtime with Python and Paramiko
• Script to backup config for Cisco Catalyst 1300 with Python and Paramiko2025-10-16
  Running standard IOS backup scripts on your shiny new Catalyst 1300 switches only to hit walls with truncated outputs or command mismatches? You’re not alone—these industrial Ethernet beasts (IE-1300 series) run a streamlined IOS-XE variant with tweaks that break old playbooks. Forget terminal length 0 for pagination; it demands terminal datadump to unleash full show… Read more: Script to backup config for Cisco Catalyst 1300 with Python and Paramiko
• Network device automation: Fetching VTP Versions from Cisco Switches with Python and Paramiko2025-10-15
  As network admins, we often face the grind of manually logging into dozens of switches to pull routine info like VTP configurations. It’s tedious, error-prone, and eats into your day. Enter Python and the Paramiko library: a powerhouse combo for SSH automation that lets you query bulk devices in seconds. In this post, I’ll walk… Read more: Network device automation: Fetching VTP Versions from Cisco Switches with Python and Paramiko
• How does X-Forwarded-For (XFF) work? Header Manipulation – Tactics, Security Risks2025-10-11
  In modern web architectures, the X-Forwarded-For (XFF) HTTP header serves as a critical mechanism for preserving the original client IP address through proxy chains, such as load balancers or CDNs like AWS CloudFront. However, its client-modifiable nature exposes it to manipulation, enabling attackers to inject arbitrary IP values and evade IP-centric security controls. This analysis… Read more: How does X-Forwarded-For (XFF) work? Header Manipulation – Tactics, Security Risks
• How I Fixed a WhatsApp Call Issue with One Contact2025-09-12
  Have you ever tried calling someone on WhatsApp, only to see “ringing” on your end while their phone just says “connecting”? That’s exactly what happened to me with one contact, and it was frustrating! Neither of us could call the other—her phone didn’t ring properly, and even when she answered, it stayed stuck on “connecting.”… Read more: How I Fixed a WhatsApp Call Issue with One Contact
• The Dangers of Connecting to Untrusted WiFi Networks: A Clear Guide for Everyone2025-08-07
  Free WiFi is everywhere—cafes, airports, hotels, and parks. It’s tempting to connect to a network like “FreePublicWiFi” to save data, but these untrusted WiFi networks can be risky. They can let hackers steal your information, like passwords or bank details. This post explains, in simple terms, how hackers use these networks to attack, especially when… Read more: The Dangers of Connecting to Untrusted WiFi Networks: A Clear Guide for Everyone
• APT37’s Sneaky JPEG Malware: How North Korean Hackers Are Weaponizing Images to Target Windows2025-08-04
  In the ever-evolving world of cybersecurity threats, state-sponsored hackers continue to innovate in their methods to evade detection. Recently, on August 4, 2025, reports emerged about APT37—a North Korea-linked hacking group also known as Reaper or ScarCruft—deploying a sophisticated variant of their RoKRAT remote access trojan (RAT). What’s particularly alarming is their use of everyday… Read more: APT37’s Sneaky JPEG Malware: How North Korean Hackers Are Weaponizing Images to Target Windows
• How Palo Alto Firewalls Match Signatures for Threat Detection2025-08-03
  Palo Alto Networks’ Next-Generation Firewalls (NGFWs) use signature-based detection as a core component of their Threat Prevention suite to identify and block threats like viruses, spyware, and exploits. These signatures are not just simple binary patterns (e.g., 01010101010) but complex rules that combine pattern matching, contextual analysis, and sometimes behavioral thresholds. Below, we dive into… Read more: How Palo Alto Firewalls Match Signatures for Threat Detection
• WordPress Security Alert: Understanding the Alone Theme Hack (CVE-2025-5394)2025-08-03
  As a reminder, this vulnerability in the Alone WordPress theme (versions 7.8.3 and earlier) is a serious zero-day that’s been exploited since July 12, 2025. It lets hackers bypass login and take over your site. Let’s dive deeper. What is CVE-2025-5394? It’s a critical flaw (CVSS 9.8) allowing unauthenticated file uploads, leading to remote code… Read more: WordPress Security Alert: Understanding the Alone Theme Hack (CVE-2025-5394)
• Predicting Stock Prices with Python: A Beginner’s Guide to Machine Learning2025-08-02
  Stock price prediction is a fascinating way to learn machine learning, combining data science with real-world applications. In this post, we’ll build a simple Python program to predict stock prices using historical data and a Linear Regression model. You’ll learn how to fetch data, engineer features, train a model, and visualize predictions. The code is… Read more: Predicting Stock Prices with Python: A Beginner’s Guide to Machine Learning
• Understand Verb in Transitive, Intransitive, Auxiliary2025-08-01
  Verbs are the powerhouse of any sentence, and understanding their types and how they tie into tenses can level up your writing and speaking. Today, I’m diving into the kinds of verbs—specifically transitive, intransitive, and auxiliary verbs—and how they work with the 12 tenses (those present, past, and future variations). What Are the Kinds of… Read more: Understand Verb in Transitive, Intransitive, Auxiliary
• Understanding OSPF Equal-Cost Multipath (ECMP) Load Balancing in Cisco Routers2025-07-31
  Open Shortest Path First (OSPF) is a widely used link-state routing protocol in enterprise networks, known for its fast convergence and scalability. One of its powerful features is the ability to perform load balancing over multiple paths to the same destination, provided those paths have equal costs (metrics). This is commonly referred to as Equal-Cost… Read more: Understanding OSPF Equal-Cost Multipath (ECMP) Load Balancing in Cisco Routers
• Use python and ML (Machine learning) to analysis Traffic in AWS CloudFront Logs (Part 2)2025-07-30
  In today’s threat landscape, where bots, vulnerability scanners, and distributed attacks are commonplace, analyzing CDN logs like those from AWS CloudFront is essential for proactive threat detection. As a cybersecurity practitioner, I’ve developed a Python tool that uses unsupervised machine learning via z-score outlier detection to identify anomalous behavior in these logs. By extracting features… Read more: Use python and ML (Machine learning) to analysis Traffic in AWS CloudFront Logs (Part 2)
• Use python and ML (Machine learning) to analysis Anomalous Traffic in AWS CloudFront Logs (Part 1)2025-07-30
  As cybersecurity professionals, we constantly face the challenge of sifting through vast volumes of log data to identify potential threats such as bots, vulnerability scanners, or distributed attacks. Recently, I developed a Python-based tool to analyze AWS CloudFront access logs for anomalous traffic patterns. Leveraging unsupervised machine learning via z-score outlier detection, this script extracts… Read more: Use python and ML (Machine learning) to analysis Anomalous Traffic in AWS CloudFront Logs (Part 1)
• Overview AWS WAF Bot Control with A Step-by-Step Guide2025-07-29
  Protecting Your Website with AWS WAF Bot Control: A Step-by-Step Guide AWS WAF Bot Control is a powerful managed rule group that helps detect and mitigate bot activity, from basic crawlers to sophisticated automated scripts. After discussions with my vendor, I learned that enabling Bot Control requires strategic integration, especially embedding the AWS WAF JavaScript… Read more: Overview AWS WAF Bot Control with A Step-by-Step Guide
• Demo of cyber security risk of XSS2025-07-22
  What is XSS and Why Is It Risky? XSS happens when a website doesn’t properly “clean” (sanitize) user inputs, like search queries or comments. An attacker can inject JavaScript code, which runs when you visit the page. Risks include: Real-world examples: In 2018, hackers used XSS on British Airways’ site to steal credit card details… Read more: Demo of cyber security risk of XSS