Examples
When IP forwarding is enabled, the operating system kernel will act as a router. In FreeBSD, NetBSD, OpenBSD, DragonFly BSD, and Darwin/Mac OS X the parameter net.inet.ip.forwarding can be set to 1 to enable this behavior. In Linux's emulation of sysctl, the parameter is called net.ipv4.ip_forward.
In most systems, the command sysctl -w parameter=1 will enable a certain behavior. This will persist until the next reboot. If the behavior should be enabled whenever the system boots, the line parameter=1 can be added/rewritten to the file /etc/sysctl.conf. Additionally, some sysctl variables cannot be modified after the system is booted. These variables (depending on the variable, the version and flavor of BSD) need to either be set statically in the kernel at compile time or set in /boot/loader.conf.
Read more about this topic: Sysctl
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