Marcio Cunha

Technical Articles

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

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Featured Articles
SpotlightRedesDevOps•4 min

Remote access without traditional VPN? How to use NetBird

Learn how to replace legacy VPN connections with managed WireGuard tunnels via NetBird, ensuring granular access control and scalability without complexity.

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Redes•5 min

How to use tcpdump on Linux to capture network packets

Learn how to use the tcpdump command-line tool on Linux to capture and inspect network packets in real time, making complex troubleshooting easier.

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Redes•6 min

How to test RJ45 network cables with a tester

Learn how to practically use an RJ45 cable tester to map pins and identify physical faults in local area networks quickly.

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Redes•4 min

How to track lost network packets with tcpdump

Learn how to use tcpdump to isolate intermittent communication failures on Linux servers using advanced packet filters.

RedesDevOps•2 min

Port already in use? How to use fuser to free up services

Is your service failing to start due to port conflicts? Learn how to use the fuser command to quickly identify and terminate processes blocking network ports on Linux.

RedesHardware•2 min

Network slow? How to find packet loops with Wireshark

Is your network freezing due to broadcast storms? Learn how to use Wireshark and port mirroring to trace and eliminate switching loops in your corporate network.

RedesDevOps•3 min

Network slow? How to check switch latency via SNMP

Learn how to monitor your network switches using SNMP and snmpwalk. Detect bottlenecks and packet loss before they impact your production traffic.

RedesDevOps•2 min

How to use the ss command to monitor TCP connections on Linux

Tired of netstat? Learn how to use the ss command to list TCP sockets, identify linked processes, and analyze network latency with superior performance.

RedesDevOps•3 min

How to use the netstat command on Linux for network connections

Learn how to diagnose open ports and identify processes consuming your network using netstat. A practical guide for network observability.

RedesDevOps•2 min

How to block ads on your network using Pi-hole

Learn how to install and configure Pi-hole to filter ads and trackers across your entire home or corporate network with this practical DNS guide.

Redes•5 min

How to measure packet loss and Wi-Fi jitter with iperf3

Learn how to run TCP and UDP stress tests on your wireless network using iperf3. Discover how to isolate jitter, real bandwidth, and packet loss problems.

Redes•4 min

Switch freezing? How to configure link aggregation with LACP

Learn how to configure port trunking and bonding on managed switches using LACP to mitigate bandwidth bottlenecks in homelab servers.

Redes•4 min

WAN port freezing? How to find packet loss with traceroute

Learn how to trace the path of data packets across the internet and discover where your connection is failing or suffering from high latency.