snmpsim VS ntopng

SNMP Simulator is an open-source, pure Python tool for executing the SNMP agents simulator. hombre_sabio explains, it "collects data from network traffic and tcdump snoops. It also stores snapshots collected from agents for future simulation. It is a pure Python solution that is easy to deploy and is highly portable."

and use software: https://www.ntop.org/

InfluxDB 2.0 Support (ntopng github)

For what it's worth, there used to be a package in many Linux repositories called "ntop" [1] but became less popular when they went commercial. There is still a community version but I have no idea how popular it is any more. It was quite popular prior to projects like PiHole. Perhaps the older ntop has fallen out of favor so maybe there won't be any confusion.

[1] - https://www.ntop.org/

Have you seen https://github.com/ntop/ntopng?

NTOP -- Traffic Analysis.

One of the comments suggests using a managed switch that supports port mirroring, and installing a Flow collector on the connected system. Google netflow collector for software options. Something like ntop may work. See... HowTo Monitor Traffic in SMEs and Home Networks: A Primer

What can I do to implement GeoIP support into ntopng? The instructions I found on the internet (e.g. https://github.com/ntop/ntopng/blob/dev/doc/README.geolocation.md) did not seem to fit the case.