ndpmon 1.4.0-2.1build1 (armhf binary) in ubuntu eoan

 NDPMon, IPv6 Neighbor Discovery Protocol Monitor, is a tool working
 with ICMPv6 packets. NDPMon observes the local network to see
 if nodes using Neighbor Discovery messages behave properly.
 When it detects a suspicious Neighbor Discovery message, it
 notifies the administrator by writing in the syslog and in some
 cases by sending an email report. NDPMon is an equivalent of
 ArpWatch for IPv6.