Marcio Cunha

Technical Articles

Practical articles, in-depth tutorials, and architectural insights on software engineering, AI, and systems.

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RedesDevOps•5 min

DNS TTL: How Cache Timing Influences Migrations and Infrastructure Changes

Learn how DNS TTL controls the propagation speed of changes and discover strategies to prevent downtime during server migrations and provider switches.

RedesDevOps•5 min

Reverse DNS in Email Servers: How It Works and Why It Blocks Spam

Learn how Reverse DNS operates in email server authentication, validating digital identities across the internet and preventing your messages from hitting spam folders.

DevOpsRedes•4 min

Linux Load Average: What the Numbers Really Mean

Learn how to correctly interpret Load Average in Linux beyond CPU myths. Understand the difference between processes waiting for a processor and tasks blocked on disk I/O.

RedesDevOps•6 min

TUN vs TAP: How VPNs and Virtual Machines Create Network Interfaces

Discover the practical difference between TUN and TAP virtual network interfaces. Understand how tools like OpenVPN and QEMU use network layers to connect computers and virtual machines.

RedesDevOps•4 min

Linux Bridge: How the Kernel Turns Your Server into a Virtual Switch

Learn how the Linux Bridge feature transforms regular network cards into advanced virtual switches to connect virtual machines and containers without extra hardware.

RedesDevOps•7 min

Linux Network Namespaces: How Containers Isolate Network Interfaces

Explore how Linux kernel network namespaces allow containers to run with fully isolated network stacks, custom routing tables, and exclusive ports.

RedesEngenharia•5 min

East-West vs North-South Traffic: Understanding Data Flows in the Data Center

Explore how East-West and North-South data flows shape modern data center infrastructure. Analyze architectural impacts, latency trade-offs, and scaling bottlenecks.

RedesDevOps•4 min

Overlay Network: How Containers on Different Servers Share a Virtual Network

Learn how overlay networks allow Docker and Kubernetes containers on separate physical servers to communicate as if they were running on the same machine.

RedesHardware•5 min

Out-of-Band Management: How to Administer Servers Without the Main Network

Learn how to maintain vital access to servers when the primary network goes down. Explore the strategies, protocols, and tools of out-of-band management.

HardwareRedes•5 min

SATA DOM in Servers: Why Small Flash Devices Drive Boot Architecture

Learn why modern datacenters rely on SATA DOMs, small flash modules plugged directly into motherboards, to boot enterprise servers reliably without consuming drive bays.