network neighbor monitoring daemon
Neighbot passively monitors ARP (IPv4) and NDP (IPv6) traffic on all Ethernet interfaces. It maintains a CSV database of IP-to-MAC address mappings and sends email alerts when new stations appear or existing mappings change. On OpenBSD, neighbot uses pledge(2) and unveil(2) to restrict its privileges after initialization.
Homepage: https://github.com/renaudallard/neighbot
Maintainer: Renaud Allard <renaud@allard.it>