listed in 'ethers' file. If it recieves one with MAC/IP pair, which is
not listed in 'ethers' file, it will send ARP reply with configured
fake address. This will prevent not permitted host to work properly
in this ethernet segment. Especially Windows(TM) hosts.
PR: ports/84627, ports/85671
Submitted by: SeaD <sead@mail.ru>
