With a true gigabit NIC (vs the gigabit NIC on the USB 2.0 bus, giving you about 300 Mpbs), up to 4 GB of RAM, and USB 3.0 ports, the RPi4 has broken the speed barrier that was keeping the RPi from being viable for this use. This, however, has changed with the new Raspberry Pi 4 b. This was because it either had only a 10/100 NIC, or because the NIC was still on the USB 2.0 bus. Until the RPi4 was released at the end of June, 2019, the RPi simply hasn't had the umph to be a viable solution in the business sector as a packet capture device for network troubleshooting. I've done a lot of projects with them that others have laid out, but this is the first packet sniffer based on the RPi for serious IT pros like us, as far as I know. It’s based on the new Raspberry Pi 4 (RPi4) single board computer (SBC), making it small, portable and affordable. Have you ever needed to use a packet sniffer to troubleshoot your network, but your laptop was tied up with something else? I have found myself in this situation 3 times in the last year, so I've created this system.
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