This guide will show you how to create a small, packet capturing computer using a Raspberry Pi Zero combined with a passive lan tap. It’s meant to be used with power over ethernet compatible networking hardware, so you can power it directly through the ethernet cables, without any batteries or USB chargers.
You simply plug it in between two ethernet cables, and it automatically powers on and begins logging the traffic that passes through.
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Not a safe implementation of a tap at all. It risks affecting the traffic and only captures traffic in one direction.