Do I need to install anything?

You choose the deployment: a single SPANSPAN: switch port analyser. A switch setting that sends a copy of network traffic to one port, where a sensor can watch it./TAPTAP: test access point. A small device that copies the traffic on a network cable for a sensor to watch. port on your switch watches a whole network segment and counts as one device, or install the NetSenX agent on the specific hosts you choose. Both are documented; no kernel modules. On Linux the installer only installs a package whose signature matches the NetSenX release key, and refuses anything else; macOS agents are set up together with NetSenX support.

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Terms used here

SPAN (switch port analyser)
A switch setting that sends a copy of network traffic to one port, where a sensor can watch it.
TAP (test access point)
A small device that copies the traffic on a network cable for a sensor to watch.

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