Package arpwatch

Network monitoring tools for tracking IP addresses on a network

http://ee.lbl.gov/

The arpwatch package contains arpwatch and arpsnmp. Arpwatch and
arpsnmp are both network monitoring tools. Both utilities monitor
Ethernet or FDDI network traffic and build databases of Ethernet/IP
address pairs, and can report certain changes via email.

Install the arpwatch package if you need networking monitoring devices
which will automatically keep track of the IP addresses on your
network.

System Administration (Section 8)
arp2ethers
arp2ethers converts file arp.dat in the current directory into ethers(5) format on stdout. Usually arp.dat is an ethernet/ip database file generated by...
arpsnmp
Arpsnmp keeps track for ethernet/ip address pairings. It syslogs activity and reports certain changes via email. Arpsnmp reads information from a file (usually...
arpwatch
Arpwatch keeps track for ethernet/ip address pairings. It syslogs activity and reports certain changes via email. Arpwatch uses pcap(3) to listen for arp...
massagevendor
massagevendor is a program that converts a text file containing ethernet vendor codes into a format suitable for use by arpwatch(8) and arpsnmp(8). The input...