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Continue reading →: 🚀 How to Install Docker on Ubuntu Server (Step-by-Step Guide)
Docker has become an essential tool for developers, system administrators, and DevOps engineers. It allows you to run applications in lightweight containers, making deployments faster, more consistent, and easier to manage. In this guide, you’ll learn how to install Docker on an Ubuntu server and get started with your first…
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Continue reading →: Microsoft Releases Emergency OOB Update to Fix Outlook Freezes
If your Outlook has been randomly freezing lately—especially while opening emails, switching folders, or simply trying to work through your inbox—you’re not alone. Microsoft has officially acknowledged the issue and has now released an emergency out-of-band (OOB) update to address the problem.This unexpected patch is aimed at restoring stability for…
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Continue reading →: Hashing & Data integrity
Hashing is the process of using a hash function in computing and cryptography that converts data into a fixed-sized string of characters, typically a sequence of letters and numbers. For example, the operating system on your pc stores passwords as hashes. The operating system uses a hashing function to hash…
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Continue reading →: 🔐 SSH Configuration with RADIUS Authentication (Cisco)
🧩 Topology 1️⃣ Basic Device & SSH Setup (Mandatory) 2️⃣ Create Local Fallback User (IMPORTANT) Used when RADIUS server is unreachable. 3️⃣ Enable AAA 4️⃣ Configure RADIUS Server 🔹 IOS / IOS-XE (Classic Method) (Older IOS alternative) 5️⃣ Create AAA Method Lists (Best Practice) Explanation: 6️⃣ Apply AAA to VTY…
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Continue reading →: ✔ Cisco Switch Hardening Template (IOS / IOS-XE)
Goal: Secure L2 attacks, management access, and user ports 🔐 1. Identity & Management Security 🔑 2. Secure VTY Access 🎯 3. Management VLAN & ACL 🚫 4. Disable Unused Services 🔌 5. Shut Down Unused Ports 🔐 6. Port Security (Access Ports) 🛡 7. Layer-2 Attack Protection 🧾 8.…
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Continue reading →: ✔ Cisco Router Hardening Template (IOS / IOS-XE)
Goal: Secure management, control plane, routing, and services 🔐 1. Identity, Passwords & AAA 🔑 2. Secure Management Access (SSH only) 🎯 3. Restrict Management Access (VTY ACL) 🚫 4. Disable Insecure & Unused Services 🧠 5. Control Plane Protection (CoPP – Basic) 📡 6. Interface Hardening 🧾 7. Logging…
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Continue reading →: 🔐 Cisco Device Hardening & Security Best Practices
(Routers, Switches, IOS / IOS-XE / NX-OS – CCNA / CCNP / Real-World) Device hardening reduces the attack surface and protects your Cisco infrastructure from unauthorized access, misconfiguration, and exploits. 1️⃣ Secure Device Access (Management Plane) 🔹 Use Strong Authentication (AAA) 🔹 Use Local User Accounts (Minimum) ❌ Avoid: ✔…
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Continue reading →: 🌐 NAT Types & PAT Configuration in Cisco Routers
NAT (Network Address Translation) allows private IP addresses to communicate with public networks like the Internet. PAT (Port Address Translation) is a form of NAT that uses port numbers to map multiple private IPs to a single public IP. 🔁 Types of NAT in Cisco 1️⃣ Static NAT (One-to-One) Configuration…
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Continue reading →: 🔐 What is an ACL?
An ACL is an ordered list of rules (statements) that a router checks top to bottom to decide whether to permit or deny traffic. 👉 Implicit deny exists at the end of every ACL (anything not matched is denied). 🧩 Types of Cisco ACLs 1️⃣ Standard ACL Example Apply to…
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Continue reading →: How to install OpenDaylight (ODL) on a Proxmox environment.
🌐 What is OpenDaylight (ODL)? OpenDaylight (ODL) is a modular, open-source Software-Defined Networking (SDN) controller developed under the Linux Foundation.It acts as the central brain of a software-defined network. Think of ODL as a network operating system that controls switches/routers from one place using programmable APIs. 🧠 What ODL Does…
Hello,
Hey there, fellow nerds and net-surfers!
Welcome to my corner of the internet where I talk about the holy trinity of tech: Networking, Linux, and Security — or as I like to call it, “Ctrl+Alt+Fix-It”. If you’re into packet sniffing (the legal kind), hardening Linux boxes, or figuring out why your network is being as moody as a teenager, you’re in the right place.
This blog is where I dump useful knowledge, random tech rants, and occasional troubleshooting victories so future me (and hopefully you) can benefit. Expect bash scripts, firewall rules, sarcastic comments, and the occasional meme — because what’s IT without a little command-line chaos and caffeine?
Whether you’re a curious beginner or a battle-hardened sysadmin, I hope you’ll find something here to learn, laugh at, or copy-paste in desperation.
Welcome aboard — and may your logs always be verbose.
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The Lazy Networker 