Explore the world of networking with expert insights on routers, switches, and firewalls. This category is your go-to resource for troubleshooting tips, configuration guides, and practical skills to optimize and secure your network. Whether you’re a beginner or a seasoned IT pro, find step-by-step solutions to keep your systems connected and running smoothly.
Transport Layer Security (TLS) ensures secure communication over the internet, evolving significantly across versions. TLS 1.1 (2006) introduced basic encryption, […]
Let’s dive into how the key exchange works in HTTPS, focusing on the interplay between asymmetric and symmetric encryption, and
Key exchange method in https Read Post »
HTTPS (Hypertext Transfer Protocol Secure) is HTTP layered over a secure protocol (typically TLS, or Transport Layer Security, formerly SSL).
What is HTTPS and how it works? Read Post »
What Are TCP, UDP, and QUIC? Before we compare them, let’s define each protocol: Now, let’s break down how they
What Are TCP, UDP, and QUIC? Read Post »
MTU (Maximum Transmission Unit) and MSS (Maximum Segment Size) are two important concepts in networking, particularly in the context of
What’s Nmap? Nmap (Network Mapper) is like a lazy guy’s spy kit—it scans networks, finds devices, and tells you what’s
Nmap for Network Scanning, for beginniner Read Post »
In the realm of application-layer security, two tools stand out: the Web Application Firewall (WAF) and the Layer 7 Firewall.
What you should know in WAF and Layer7 firewall? Read Post »
IPsec VPNs are critical for securely connecting distributed sites, such as a core office with a Palo Alto PA-820 firewall
How to Troubleshoot IPsec VPN Issues: Step-by-Step Guide for Palo Alto 820 Read Post »
In a previous analysis, detailed in The Curious Case of Deny Logs in Palo Alto SSL Decryption: A Troubleshooting Journey
Investigating PAN-273949: A Potential Resolution for SSL Decryption Deny Log Anomalies Read Post »
Let’s set up a lab to configure a Cisco VXLAN EVPN-BGP fabric with a spine-leaf topology, including normal leaf switches
Lab to configure a Cisco VXLAN EVPN-BGP fabric with a spine-leaf topology Read Post »
Let’s dive into setting up a Cisco switch using Python automation! This is a great way to streamline network configuration
Setting Up a Cisco Switch with Python Automation Read Post »
I recently added Cloudflare CDN to my WordPress site on Linode, updated GoDaddy nameservers to Cloudflare, and bam—every link hit
Cloudflare Flexible SSL vs. Full SSL: Fixing WordPress 301 Redirect Loops Read Post »
If you’re familiar with Cisco’s Management VRF, where management traffic is isolated into a separate routing domain, you might wonder
Configuring Fortinet Firewall Outbound Management: Cisco Mgmt VRF Equivalent Read Post »
For three relentless days—24 hours non-stop—I served on the blue team during a government cybersecurity drill that pushed us to
Share a real world cyber security drill Read Post »
Key Points What Cisco Secure Network Analytics Does Cisco Secure Network Analytics is a tool that watches your network like
How Cisco NDR to discover network activity? Read Post »
As a network engineer managing a mixed environment—Cisco, Juniper, FortiADC, and AWS CDN—I recently hit a head-scratcher that didn’t have
FortiADC TLS Mismatch with Backend Servers: A Real-World Troubleshooting Case Read Post »
How I Fixed the “XML Declaration Allowed Only at the Start of the Document” Error in Yoast SEO Sitemap If
Traffic flow: AWS > Firewall > reverse proxy > Paloalto > Load balancer > Backend server If you’ve ever stared
The Curious Case of “Deny” Logs in Palo Alto SSL Decryption: A Troubleshooting Journey Read Post »
If you’re managing a FortiADC device and rely on its auto backup feature to keep your configurations safe, you might
FortiADC Auto Backup Failure to SFTP Server – A Fix in Firmware V7.6.1 Read Post »
Cryptography is the art of securing communication, transforming readable data into something unreadable to protect it from prying eyes. Let’s
What are cryptography? Read Post »
Lazy Guy’s Socket Programming Demo Type a message and “send” to simulate client-server socket communication (using WebSocket for real-time demo).
Socket Programming in Python: Build a Client-Server Chat Read Post »
IntroductionImagine logging into your bank account, shopping online, or scrolling through social media—only to have your personal data stolen without
How hacker get your access, xss Read Post »
What’s SQL Injection? Imagine my blog has a login box—username and password. Behind the scenes, it’s talking to a database
SQL Injection basic concept Read Post »
Hey there, tech wanderers! Welcome back to Lazy Guy’s Tech Hub at https://www.lazy-guy.xyz/. Today, we’re diving into the wild world
Understanding DoS and DDoS Attacks Read Post »
How to Spot a Phishing Email Like a Lazy Pro Published on March 09, 2025 by Lazy Guy Phishing
Spot fake email, stay alert Read Post »
Teaching Guide: How to Configure Cisco Router NAT to Access the Internet Level: Beginner (Zero IT Knowledge) What is Cisco
Config cisco router NAT to access internet Read Post »
Teaching Guide: Configuring OSPF with Authentication on a Cisco Router Level: Beginner (Zero IT Knowledge)Topic: Basic OSPF in Area 0
Learning cisco ospf start from zero Read Post »
Hey there, Lazy Guy readers! If you’ve ever noticed that little padlock next to www.lazy-guy.xyz in your browser, you’ve seen
How SSL/TLS Works and HTTP not Secure Read Post »
HTTP Unveiled: Exploring HTTP/1.1, HTTP/2, and HTTP/3 in Detail Welcome to another tech dive at Lazy Guy’s blog! Whether you’re
HTTP/1.1 vs. HTTP/2 vs. HTTP/3 Explained Read Post »
The Cisco Catalyst 9200 series is a powerful line of switches designed for enterprise networks, offering robust features like VLAN
Cisco switch trunk and access port Read Post »
