Building an Aruba Central Producer in Go: Four API edge cases we had to solve
A deterministic infrastructure collector sounds straightforward: authenticate, call the API, normalize the response, and write JSON. Enterprise APIs q…
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The Middelmen (Ep-3 of The 0$ Cloud)
It turns out the internet is full of middlemen. Some forward requests, some establish trust, and some simply make communication possible. I learned ab…
AWS VPC — Your Private Network in the Cloud, Explained from the Ground Up
🌐 AWS Session 9 — Amazon VPC Private Networking · Subnets · Internet Gateway · Route Tables · Security Groups · NACLs · NAT Gateway Part of my AWS lea…
Why AWS Is Tearing Down the "Tree"?
Amazon CEO Andy Jassy has been on a highly publicized crusade lately to crush corporate bureaucracy. His goal? Flatten the org chart, remove the layer…
I'm a Dev Who Barely Knows the Kernel. Here's How I'm Learning How to Track a Packet with pwru
Hello, I'm Maneshwar. I'm building git-lrc, a Micro AI code reviewer that runs on every commit. It is free and source-available on Github. Star git-lr…
Understanding the OSI Model Through One Network Request
The Hook Every networking course begins with the same seven mysterious layers: Physical Data Link Network Transport Session Presentation Application S…
XChaCha20-Poly1305 in a Mesh Network: A Practical Deep Dive
Most encryption tutorials stop at "use AES-256-GCM." But in a mesh network, the threat model is different. Keys rotate constantly. Messages arrive out…
🌐 Monitoring the Remote Frontiers: How I Visualized Distributed Infrastructure Latency Using SigNoz
The Hook: The Mystery of the 200ms Drop in Remote Nodes A few days ago, I was looking at the traffic routing of a distributed microservice network. O…
QUIC-Based NAT Traversal: How PUNCH_ME_NOW Frames Are Standardizing Hole Punching
TL;DR: NAT traversal has historically relied on STUN/TURN/ICE running as an external signalling layer bolted onto whatever transport protocol you choo…
# The Journey of a Request: How NGINX Routes Traffic Between Docker Containers in a Modern Web Application
The Journey of a Request: From Browser to Database and Back Have you ever wondered what actually happens after you type a website URL into your browse…
MikroTik QoS CAKE Optimization, ESP32 IoT Smart Key, and Self-Hosted Server Infrastructure
This technical report comprehensively documents a network infrastructure and embedded systems engineering project. The primary focus encompasses IoT h…
A Differential Test Harness for Native vs. Generic XDP: Methodology and Baseline
Native XDP and generic SKB-mode XDP are not the same thing in practice. The same BPF program can pass the verifier and still behave differently depend…
За пределами QNetworkAccessManager: проектируем типобезопасный HTTP Runtime для Qt на C++20
В статье рассматривается реализация типобезопасного HTTP runtime поверх QNetworkAccessManager и современного C++20 . Разберём использовани…
DNS Propagation Time: How Long Until Your DNS Change Goes Live?
You change the A record for api.example.com from 203.0.113.10 to 203.0.113.20`. Your browser shows the new IP. The deployment dashboard says green. Th…
EEM 101: On-Box Automation That Runs Even When Your NMS Doesn't
This is Part 1 of a 5-part series on Cisco EEM. We start here with the fundamentals and a few working applets, then build toward self-healing networks…
Hello World from Valex-Grand: Building Resilient Systems
Architecture is not just about writing code; it's about building systems that survive. As an independent software developer, my focus centers on low-l…
The Dark Art of UDP Hole Punching: How to Build a Serverless Web
If you want to build a truly decentralized application—one that doesn't rely on AWS, Vercel, or a centralized RPC node—you immediately run into a bric…
AI Agent Cannot Reach Peer on Another Cloud? Here's the Fix
You spin up an agent on AWS. It needs to call a tool-serving agent your teammate deployed on GCP. You get connection refused , or worse, a silent time…
Building Lens: A Transparent Network Introspection Tool in Rust
Building Lens: A Transparent Network Introspection Tool in Rust One of the most frustrating parts of debugging modern applications is understanding wh…
Fixing the 550 SPF Check Failed Error: A Technical Step-by-Step Troubleshooting Guide
Understanding the 550 SPF Check Failed Error The "550 SPF Check Failed" error indicates that a receiving mail server rejected an incoming email. This …
Your uptime monitor is lying to you: why single-vantage-point monitoring can't see network reality
Most uptime tools answer the same question. They tell you "is service X up?" from one vantage point — the monitoring server. But in a hybrid cloud, "u…
Used Cisco Catalyst switches: 2960X vs 3750X vs 3850
If you're building a lab or scaling a small office network, Cisco Catalyst switches dominate the second-hand enterprise market. They're robust, well-d…
How to Let a Vercel App Read a Private ClickHouse on EC2 (Using Cloudflare Tunnel)
A start to finish walkthrough, with every piece of jargon explained in plain language. Why you might need this Sooner or later, most teams end up with…
Stop manually tuning Unbound DNS: How I built an auto-tuning DNS Firewall
If you've ever managed a DNS server at scale (like for an ISP or a large corporate network), you know that standard configurations don't cut it. You h…
I built one iOS app that controls four different Hisense smart-TV platforms — here's how each protocol works
The problem My Hisense remote died last year and I went down a small rabbit hole trying to find a single iOS app that worked across all the Hisense sm…
From one blocking accept() to epoll: a C TCP server up the I/O ladder, measured
I connected one client to a blocking TCP server and held the socket open without sending a single byte. Then I connected a second client and sent it a…
Building NetZero: Automated Zero-Trust K8s Network Policies Using Go and eBPF
NetZero: Automated Zero-Trust K8s Network Policies Using Go and eBPF Implementing zero-trust networking in a microservice architecture is a massive pa…
Building a 5G UPF That Actually Saturates a 10G Link: VPP + DPDK + Open5GS in Production
Most writing about DPDK and VPP stays comfortably abstract. Libraries and drivers for fast packet processing. Kernel bypass. Zero-copy I/O. Poll-mode …
I wanted a Go networking engine that gets out of the way, so I built one (Breeze).
Over the past few months, I've been working on Breeze, a networking engine built on top of gnet. The goal wasn't to create "another web framework." Th…
Passive Reconnaissance on google.com — What I Found Using Shodan, WHOIS, and DNS Tools
Before a penetration tester runs a single exploit, they spend a significant amount of time just watching. Collecting. Mapping. This phase is called re…