The handful of dig and nslookup commands that solve most day-to-day DNS problems, from missing records to stale caches.
Hi — I'm Fernando
I write practical, no-nonsense guides on networking and security — from CCNA-level fundamentals to home-lab firewall configs. This is where I put the notes I wish existed when I was learning.
✏️Articles
Generate keys, write a minimal config, and get a WireGuard tunnel running between a server and a client in under ten minutes.
Step-by-step commands for creating VLANs, assigning access ports, and setting up a trunk between two Catalyst switches.
A no-nonsense walkthrough of subnet masks, CIDR notation, and how to carve a network into smaller pieces without reaching for a calculator every time.
🔗Projects
Subnet Calculator CLI
A terminal tool for computing network/broadcast addresses, usable host ranges, and VLSM splits from a single CIDR block.
Home Lab Network Diagram Generator
Reads a simple YAML topology file and renders a network diagram, meant for documenting home lab and small office setups.
pfSense Firewall Rule Auditor
Parses an exported pfSense ruleset and flags overly broad rules, unused rules, and rules that shadow one another.
Packet Capture Analyzer
A lightweight wrapper around tshark for summarizing pcap files by protocol, top talkers, and suspicious traffic patterns.