Lynis Security Controls

NETW-3032 - ARP monitoring


Consider the usage of a tool which monitors ARP traffic



How to solve

The network is a dynamic environment where devices show up and disappear again. Proper monitoring of devices can help with the detection of intruders, or find the cause of network issues for some systems.

This control checks for the presence of a tool like arpwatch. Such tool helps with monitoring the network and store ARP requests. Any device showing up on the network subnet will also show up in the tool. Depending on your environment you might want to consider to deploy this tooling only on one system, instead of each system. In such case it is suggested to disable the control in your Lynis profile.

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Linux and Unix System Hardening

This information is provided as part of the Lynis community project. It is related to Lynis control NETW-3032. All information should be considered as-is, without guarantees. Any advice or snippets should be tested before implementing in production environments.


Lynis is a technical security audit tool for Unix flavors like Linux, macOS, AIX, Solaris, and *BSD. It is open source software and free to use. The project has an active community, including open development via GitHub.

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