Dev log #14 Hardening the DHT against Eclipse attacks and the endless battle with flaky p2p tests
Dived deep into libp2p security this week with a new IP subnet diversity feature for the Kad-DHT, while fighting a few stubborn race conditions in the…
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VPN Troubleshooting, One Layer at a Time: A Diagnostic Checklist
Most VPN troubleshooting goes wrong in the same predictable way: three things get changed at once, and whatever happens next, nothing has been learned…
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…
DEV WEEKEND with AWS Student Builder Group, QAU Islamabad
Spent 3 days at Quaid i Azam University Islamabad for DEV WEEKEND, organized by the AWS Student Builder Group. What was covered: Tech career journeys …
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…
TLS and mTLS for Infra Services: A Production Deep Dive for Solo Devs and Small Startups
Why this exists This started as a cost problem, not a security paper. I was running a small production setup across two servers: a dedicated 1cpu/1GB …
Deploying Gateway API with TLS Encryption on Kubernetes
The Kubernetes Gateway API is the successor to Ingress, a more expressive, role-oriented resource model ( GatewayClass , Gateway , HTTPRoute ) for adv…
Deploying HAProxy on Ubuntu 22.04
HAProxy is an open-source proxy that load-balances TCP and HTTP traffic across backend servers, routing each request based on health checks and your c…
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…
Introducing RegionCheck: Test Endpoints from AWS, Azure, and Google Cloud Regions
Today I'm excited to launch RegionCheck , a tool for testing, monitoring, and debugging endpoints from cloud regions around the world. The idea is sim…
One Tap, Public URL: Building an Android App for Secure Port Forwarding
As developers, we've all been there. You have a web server, API, dashboard, or IoT service running locally, and you need to share it with someone outs…
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…
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…
Day 5: Understanding NAT, VAT, Traffic Flow, and Ports & Services
Many beginners entering cybersecurity and SOC analysis rush toward tools, dashboards, and alerts. However, experienced analysts know that most SOC mis…
Why Webhooks Time Out for Long-Running Autonomous Agents (and the Fix)
If you're debugging why your autonomous agent's webhook keeps timing out or dropping events mid-task, the short answer is: webhooks were designed for …
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…
Implementing DKIM and DMARC for Google Workspace: A Step-by-Step Technical Guide to Authenticate Your Emails
The Imperative of Email Authentication for Google Workspace Email remains a primary communication channel for businesses. However, its open nature mak…
HTTP/2: The Protocol That Stopped the Connection Explosion
In the previous article , we explored why HTTP/1.1 eventually became a bottleneck. The web had evolved from a collection of simple documents into a pl…
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 …
The Hidden Dangers of DMARC p=none: Why It's Undermining Your Email Security (Not Just Deliverability)
Understanding DMARC and the 'p=none' Policy DMARC (Domain-based Message Authentication, Reporting, and Conformance), defined in RFC 7489, is an email …
How to Configure DMARC Forensic Reports (RUF): A Technical Step-by-Step Guide for Postmaster Debugging
Understanding DMARC Forensic Reports (RUF) Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an email authentication protocol…
Why DMARC p=reject Isn't Your Ultimate Deliverability Shield (And What You're Missing)
DMARC p=reject: A Foundational Layer, Not an Impenetrable Shield Organizations often view DMARC p=reject as the ultimate defense against email spoofin…
Configuring DMARC p=quarantine: A Technical Step-by-Step Guide to Secure Your Domain and Improve Deliverability
Introduction to DMARC and the p=quarantine Policy DMARC (Domain-based Message Authentication, Reporting, and Conformance), defined in RFC 7489 , is an…
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…
We tested 62,541 free proxies from GitHub. Only 4% actually work.
If you've ever grabbed a "free proxy list" off GitHub, you already know the feeling: you paste 10,000 IPs into your scraper, and approximately none of…
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 …
DNS Explained: How Your Browser Decodes Website Addresses
You type www.google.com into your browser and hit Enter. The page loads in under a second. But stop and think about what just happened. Your browser d…