In this episode of Linux Server Admin with Fexingo, Lucas and Luna dive into network performance tuning on Linux servers using the sysctl utility. They focus on a practical case: optimizing TCP stack parameters for a high-traffic web server handling thousands of concurrent connections. Lucas explains how to adjust settings like net.core.somaxconn, net.ipv4.tcp_tw_reuse, and net.ipv4.tcp_fin_timeout to reduce latency and prevent connection drops under load. Luna shares a real-world example from a previous gig where a misconfigured net.core.rmem_max caused packet loss during a Black Friday sale. They also cover how to make changes persistent via /etc/sysctl.conf and the risks of blindly copying tuning guides. The episode includes a low-key listener-support mention and ends with a forward-looking question about kernel parameter versioning. Perfect for sysadmins who want to squeeze more performance out of their existing hardware without buying new gear.