1. log_movements: do you want to log the arp overwritten message or not?
2. log_wrong_iface: do you want to log when an arp arrives at the wrong
interface?
3. log_permanent_modify: do you want to log when an arp message attempts
to overwrite a static entry?
I did not call the sysctls log_arp like FreeBSD does, because we already
have an arp sysctl level. The default is on for all three of them.
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