From the TCP/IP model, IP addressing, CIDR, and NAT to network configuration, routing, DNS, firewalls, and troubleshooting — the concepts every developer needs and the Linux commands that put them to work.
Dns
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Linux Networking Fundamentals -
IP Address Management (IPAM): A CCNA-Focused Guide A comprehensive, CCNA-focused guide to IP Address Management — what IPAM is, the IPv4 address space and RFC 1918 you have to manage, subnetting and VLSM worked the way the exam expects, DHCP (the DORA process, Cisco IOS server and ip helper-address relay config), DNS record types, IPv6 addressing (global unicast, link-local, EUI-64, SLAAC vs DHCPv6), and how real IPAM is done with spreadsheets, phpIPAM, NetBox, and full DDI platforms like Infoblox. Built around the 200-301 IP Connectivity and IP Services domains, with real config and address plans.
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Anycast Explained: One IP Address, Served From Everywhere A deep technical look at anycast routing — how the same IP prefix is announced from dozens of BGP locations simultaneously, why the internet's most critical infrastructure depends on it, and the real-world trade-offs operators face.
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What Happens When You Type a URL and Press Enter A technically precise, end-to-end walkthrough of every major step between pressing Enter and pixels appearing on screen — from URL parsing and DNS to TCP, TLS 1.3, HTTP, CDN routing, and the browser's critical rendering path.
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Active Directory Domain Services Fundamentals The backbone of enterprise identity, explained for the Linux admin: domains, trees, and forests; organizational units and delegation; the tight dependency on DNS; the global catalog and FSMO roles; replication topology and sites; accounts and groups and the security implications of nesting; and standing up a domain controller from scratch. How AD actually models an organization, what is new in Windows Server 2025, and where it bites you.
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CCNA: DHCP, DNS, and NTP on IOS Configuring DHCP server, DHCP relay, DNS resolution, and NTP time synchronisation on Cisco IOS — complete configuration, verification commands, and troubleshooting for all three protocols.
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Consul Service Discovery and Service Mesh How HashiCorp Consul turns service discovery from static config into dynamic, health-aware runtime queries — its DNS and HTTP interfaces, health checking, and KV store — then grows into a full service mesh with mTLS between services.
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DNSSEC Setup and Operation: KSK/ZSK Rotation, DS Publication, and Validation Debugging A practical guide to deploying DNSSEC — how zone signing prevents spoofing and cache poisoning, KSK/ZSK key rollover, getting DS records published at the parent, and debugging validation failures when resolvers go bogus.
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DNS over HTTPS and DNS over TLS: Encrypting the Internet's Phone Book A deep dive into DNS over HTTPS (DoH) and DNS over TLS (DoT): why plain DNS is a privacy and security problem, how encrypted DNS protocols work, deploying your own resolver, and configuring clients.
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Pi-hole and AdGuard Home: Network-Wide Ad Blocking for Your Homelab A practical guide to deploying Pi-hole or AdGuard Home as your homelab DNS server — covering blocklists, DNS-over-HTTPS, split-horizon DNS, DHCP, and keeping the whole family happy.
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pfSense and OPNsense: The Complete Home Lab Firewall Guide A comprehensive guide to pfSense and OPNsense — comparing the two platforms, choosing hardware, installing and configuring from scratch, setting up DHCP, DNS-over-TLS, firewall rules, NAT, VLANs, WireGuard, high availability with CARP, packages like pfBlockerNG and Suricata, and hardening your router/firewall for the home lab or small business.
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Self-Hosting Your Email: Postfix, Dovecot, Stalwart, and the Deliverability Gauntlet A brutally honest, comprehensive guide to running your own mail server — covering the Postfix+Dovecot+Rspamd classic stack, the modern Stalwart all-in-one, DNS authentication records, and the deliverability reality that makes getting into Gmail's inbox the hardest part of the whole endeavor.
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The Vibecoder's Home Lab: Running AI Agents Across Multiple Machines A comprehensive technical guide to building a home lab purpose-built for AI-assisted development — covering hardware selection, network architecture, DNS, Proxmox virtualization, shell configuration, running parallel Claude Code agents with git worktrees and tmux, agent sandboxing, and the workflows that make vibecoding genuinely efficient.
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DNS Deep Dive for Developers Understanding DNS records, propagation, and common configuration patterns.