arpalert - 2.0.12-3 main

The arpalert daemon is a security tool that listens on a network interface
(without using 'promiscuous' mode) and catches all conversations
of MAC address to IP request to alert of possibility of ARP spoofing attack.
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It compares the mac addresses it detected with a pre-configured list of
authorized MAC addresses. If the MAC is not in list, arpalert launches a
pre-defined user script with the MAC address and IP address as parameters.
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If you need to use a list of authorized MAC addresses, this package should
suit your needs, otherwise arpwatch may be also fine.