Package ip-sentinel

Tool to prevent unauthorized usage of IP addresses

http://www.nongnu.org/ip-sentinel/

IP Sentinel is a tool that tries to prevent unauthorized usage of
IP addresses within an ethernet broadcast domain by answering ARP
requests. After receiving faked replies, requesting parties store
the MAC in their ARP tables and will send future packets to this
invalid MAC, rendering the IP unreachable.

System Administration
Command Description
ip-sentinel keeps your IP space clean