Using Sysctl on FreeBSD

I read a thread on FreeBSD-Security about seeing ARP messages on FreeBSD servers acting as firewalls or gateways. How could you figure this out if you didn’t know the appropriate variable to change? First, use grep with.sysctl to see if any variables involve ARP: “arp_wrong_iface: log arp packets arriving on the wrong interface” You can disable either of these variables using syntax like the following: “arp.log_arp_movements””]

Source: https://taosecurity.blogspot.com/2004/01/using-sysctl-on-freebsd-i-read-thread.html