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Linux offers a vast array of capabilities and features, many of which stem from the settings and controls managed by the kernel. For system administrators and power users, the ability to tweak these kernel parameters on-the-fly can be invaluable for optimizing performance and security. Today, we delve into how to use sysctl -w to enable or disable kernel features, particularly focusing on network settings such as IPv6 and ICMP responses. Q1: What is sysctl? A1: sysctl is a tool for Linux and other Unix-like operating systems that allows querying and changing kernel runtime parameters. These parameters are found in the /proc/sys/ directory and can control everything from memory management to network settings and more.