Sameer Naik

  Implementing High-Traffic Enterprise DNS with On-Prem + Cloud Hybrid Setup on RHEL Introduction DNS (Domain Name System) is the backbone of the internet, translating human-readable domain names into IP addresses. In enterprise environments, DNS must handle high traffic, high load , and ensure redundancy, security, and scalability . Combining on-premises physical servers with cloud DNS services provides a hybrid solution for resilience and global reach. This guide explains step-by-step how to implement this architecture using: Physical servers: IBM, HP, Dell Operating system: Red Hat Enterprise Linux (RHEL) DNS software: BIND Hybrid architecture: On-prem + Cloud secondary DNS Step 1: Hardware and Network Preparation Server Requirements (Each Node): Brand: IBM / HP / Dell CPU: Intel Xeon / AMD EPYC, multi-core RAM: 64–128 GB Disk: OS: SSD RAID-1 Logs / Zones: SSD RAID-10 Network: Dual 10Gb NICs (bonded recommended) Network Configuration: Assign static IP addresses for DNS server...

  SIM Card Security, Supply-Chain Trust, and National-Scale Risk A Technical and Policy-Grade Analysis Abstract Subscriber Identity Modules (SIM cards) form the cryptographic root of trust in mobile telecommunications networks. Although invisible to end users, SIMs execute security-critical functions that underpin authentication, encryption, identity binding, and network access. This article examines theoretical but historically grounded supply-chain risks associated with SIM cards—particularly those arising from silicon-level manipulation, hidden debug access, and compromised cryptographic primitives —and explains why such risks are treated seriously by governments despite the absence of user-visible symptoms or confirmed mass exploitation. This analysis is non-speculative, non-political, and evidence-aligned , focusing on engineering realities and national-infrastructure threat modeling rather than consumer fear narratives. 1. SIM Cards as Security-Critical Computing Devices A S...

  📌 Android 13 (Tiramisu): Known Issues & Vulnerabilities 🛡️ Official Security Vulnerabilities and Patches Android’s security model relies heavily on monthly security updates from Google. These updates include fixes for vulnerabilities in core components such as the Android Framework , System components , and the Linux kernel . Android 13 devices that have current security patches are protected against these issues. ( Android Open Source Project ) 👾 High-Severity Vulnerabilities & Zero-Day Exploits (2025) December 2025 Security Update (Android 13 +) In late 2025, Google released a major update addressing 107 vulnerabilities affecting Android versions including Android 13 . Notable high-severity issues include: ( Tom's Guide ) CVE-2025-48633 — Information Disclosure: affects the Android Framework; could expose sensitive memory data and is confirmed to be under limited targeted exploitation . ( SOCRadar® Cyber Intelligence Inc. ) CVE-2025-48572 — Elevation of Privilege:...

How Auto Dialers and Predictive Dialers Work: A Contextual Overview In today’s world of large-scale outreach—whether in marketing, surveys, political campaigns, or customer support— Auto Dialers and Predictive Dialers play a critical role. These systems allow organizations to automatically dial thousands of phone numbers , connecting calls efficiently to agents or automated systems while optimizing network resources and costs. This article explains the software architecture and workflow of these dialers, showing how they work behind the scenes. 1. Core Components of Auto Dialers At the heart of an auto dialer system are several interconnected components: 1.1 Call List Manager The Call List Manager maintains the database of phone numbers and associated metadata. This includes: Campaign schedules Priority flags Caller history Do-Not-Call restrictions The manager ensures that the dialer only targets valid and permissible numbers. 1.2 Dialing Engine The Dialing Engine is the central br...

  How a “Perfectly Written” Email Can Still Be Malicious A Deep‑Dive Case Study to Help You Stay Safe** Introduction Not all malicious emails look suspicious. Some are long, formal, bilingual, detailed, and emotionally convincing . They mention real police stations, real government departments, legal terms, hospital receipts, IMEI numbers, and even victim compensation schemes. Because they look too real , people assume: “This must be genuine. Who would fake something so detailed?” That assumption is exactly how attackers succeed . This article explains — step by step — why such emails are dangerous , how attackers design them , and how you can protect yourself , using a real‑world style example involving Marathi + English content and official authorities. 1. The Core Trick: Legitimacy Overload One of the strongest red flags in modern phishing is too much legitimacy at once . What attackers do: Use formal government‑style language Add multiple authorities in the “To” or “CC” field ...

  Self-healing in code, operating systems, or electronics means a system can detect problems and automatically fix or recover from them with little or no human help—kind of like how your body heals a cut. 1. Self-healing Code (Software) This refers to programs that can notice errors or failures and correct themselves while running . How it works: Detects crashes, bugs, or unexpected behavior Restarts failed parts Switches to backup logic Fixes corrupted data or states Examples: A web app that restarts a broken service automatically A program that retries a failed network request AI systems that adjust their behavior when results are wrong Common techniques: Error handling & retries Watchdog processes (monitoring other processes) Redundancy (multiple copies of the same service) Machine learning–based repair (advanced systems) 2. Self-healing Operating Systems A self-healing OS can protect itself from damage and restore normal operation . What it can do: Detect corrupted syste...

Integrated Civil Engineering Framework for a 320 m High-Rise Building 1. Building Construction (Conceptual System & Diagrams) 1.1 Building Type Supertall building (≥300 m) Typical usage: mixed-use (commercial + residential) Structural system: Composite (RCC + Structural Steel) 1.2 Vertical Zoning (Diagrammatic Description) |--------------------------------| 320 m | Mechanical Floors | |--------------------------------| | Residential Floors | |--------------------------------| | Sky Lobby / Transfer Floors | |--------------------------------| | Commercial / Office Floors | |--------------------------------| | Podium Structure | |--------------------------------| | Raft + Pile Foundation | |--------------------------------| | Bedrock | 1.3 Structural Components Foundation : Pile-Raft System Core : Reinforced Concrete Shear Core Columns : Composite (Steel encased in RCC) Floors : Flat slab / composite deck sl...

  Complete Guide to HTML Tags: Usage, Purpose, and Context HTML (HyperText Markup Language) is the standard markup language for creating web pages. It defines the structure and content of a webpage using a system of tags . Each tag serves a specific purpose and has a particular context of usage. Understanding when and why to use each tag is critical for building semantic, accessible, and maintainable websites . 1. Document Structure Tags <html> Purpose: Root element of an HTML document. When & Why: Wraps the entire document. Required for browsers to recognize the content as HTML. Where: The top-level tag of every HTML file. <!DOCTYPE html> Purpose: Declares the document type and version of HTML. When & Why: Ensures browsers render the page in standards mode rather than quirks mode. Where: Must be the first line in an HTML file. <head> Purpose: Contains metadata, links to external files, scripts, and styles. When & Why: Essential for defining d...

  (1) DETAILED ANALYTICAL REPORT (Standard manufacturing procedure of Rajata Bhasma)  Standard manufacturing procedure of Rajata Bhasma - PMC 1. Background & Context Rajata Bhasma is a classical Ayurvedic metallic formulation derived from silver, prepared through specialized pharmaceutical processes described under Rasa Shastra . Traditionally, metals are detoxified and transformed into bio-acceptable forms using Shodhana (purification) and Marana (incineration/compounding) techniques. With increasing global demand for Ayurvedic medicines , concerns regarding quality deterioration due to commercialization have necessitated the development of Standard Manufacturing Procedures (SMPs) to ensure safety, reproducibility, and therapeutic efficacy . 2. Objectives of the Study To study the effect of Shodhana on raw Rajata (silver) To develop and document a Standard Manufacturing Procedure (SMP) for Rajata Bhasma suitable for modern pharmaceutical practice 3. Materials &...

  In-Depth Overview of Oracle VM VirtualBox Oracle VM VirtualBox is a powerful, open-source virtualization software that allows users to run multiple operating systems (OS) simultaneously on a single physical machine. This software provides a platform to host virtual machines (VMs) with a wide range of guest operating systems, enabling users to experiment with, test, and develop software across multiple platforms without requiring multiple physical devices. Whether you’re a developer, tester, or enthusiast, VirtualBox offers a rich set of features that makes cross-platform virtualization accessible and efficient. In this article, we’ll dive deep into the features of Oracle VM VirtualBox, explaining its core capabilities and the powerful tools it offers to manage virtual environments. 1. Cross-Platform Host Support VirtualBox is designed to run on a variety of host operating systems , which makes it highly versatile. It supports: Windows : Including Windows 7, 8, 10, and 11...