Throwing Star LAN Tap line monitoring tool

Packet capture artifact Throwing Star LAN Tap

original project

This thing is also sold in a certain treasure, but it’s not worth it for dozens of yuan each. The cost (a single board only counts the components is less than 2 yuan)

The board has been verified and all functions are normal.

Important note: The wiring of the PCB board is generated automatically without considering any differential and impedance matching. Although these are strictly required by the RJ45 standard, the impact on this project is only reflected in the slower network speed between AB (70 Mbit/s). about). Since it will not affect the main function of packet capture and monitoring, I will not make further modifications. (just lazy)

Instructions:

1. Connect the A and B interfaces of the module in series between the monitored device and the upper-layer network device (such as optical modem, router, switch)

2. Depending on the monitoring requirements, connect the computer network card to port C or D.

3. Start wireshark and select the local connection network card that needs to be listened to

4. Start the monitored device normally and start monitoring data.