freebsd-ports/security/ipguard/pkg-descr

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ipguard listens network for ARP packets. All permitted MAC-IP pairs
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
local ethernet segment.
Author: SeaD <sead at deep.perm.ru>
WWW: http://ipguard.deep.perm.ru/