Arpwatch

{{Short description|Computer networking software tool}} {{more citations needed|date=May 2026}} {{Infobox software | name = arpwatch | logo = | screenshot = | caption = | author = Craig Leres | developer = Lawrence Berkeley National Laboratory Network Research Group | released = v1.0 Tue Jun 16 3:05:31 PDT 1992 | latest release version = 3.3 | latest release date = {{release date and age|2022|03|26}} | programming language = C | operating system = Cross-platform | platform = | language = English | genre = Computer security | license = 3-clause BSD source with autoconf parts under GNU General Public License | website = {{URL|ee.lbl.gov}} }} {{Lowercase title}} '''arpwatch''' is a computer software tool for monitoring Address Resolution Protocol traffic on a computer network.<ref>{{cite web | url=http://linux.die.net/man/8/arpwatch | title=arpwatch(8) manual page | accessdate=2015-01-07}}</ref> It generates a log of observed pairing of IP addresses with MAC addresses along with a timestamp when the pairing appeared on the network. It also has the option of sending an email to an administrator when a pairing changes or is added.

Network administrators monitor ARP activity to detect ARP spoofing, network flip-flops, changed and new stations and address reuse.

arpwatch was developed by Lawrence Berkeley National Laboratory, Network Research Group, as open-source software and is released under the BSD license.

==See also== *ArpON *arping *Ettercap

==References== {{Reflist}}

==External links== * [https://ee.lbl.gov/downloads/arpwatch/ Source files]

Category:Free network management software Category:Linux security software Category:Unix security software Category:Software using the BSD license