After understanding the problem and deciding to use Wireshark, the first step would be to decide where to locate it. For this purpose, we need to have a precise network diagram (at least the part of the network that is relevant to our test).
The principle is to locate the device that you want to monitor, connect your laptop to the same switch that it is connected to, and configure a port mirror or monitor to the monitored device. This operation enables you to see all traffic coming in and out of the monitored device.
You can monitor a LAN port, WAN port, server or router port, or any other device connected to the network.
In the ...