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...When an NDP message is flagged, it notifies the administrator by writing to the syslog or by sending an email report. It may also execute a user-defined script. For IPv6, NDPMon is an equivalent of Arpwatch for IPv4, and has similar basic features with added attacks detection.
NDPMon also maintains up-to-date a list of neighbors on the link and watches all advertisements and changes. It permits to track the usage of cryptographically generated interface identifiers or temporary global addresses when Privacy extensions are enable (default behavior in Ubuntu and Windows for example).
EasyIDS is an easy to install intrusion detection system based upon Snort. EasyIDS is designed for the network security beginner with minimal Linux experience. EasyIDS includes CentOS linux, Snort, Barnyard, mysql, BASE, ntop, arpwatch, and more.
NDPWatch is a daemon that monitors ipv6 activity and keeps a database of ethernet/ipv6 address pairings. It reports abnormal changes via mail. It has pretty the same features than its IPv4 analog ARPWatch.