You should use port mirroring, if you wish to examine traffic on an Ethernet port other than the one your Wireshark system is plugged into. If you just need to isolate and check up on local conditions, plugging the system on which Wireshark is installed into the relevant switch port will enable you take readings on the hardware addresses associated with that port, broadcast/multicast traffic, and traffic passing to and from the system between ports. To get the most out of this utility, you’ll need to plan ahead a little – mostly to determine what it is that you actually want to monitor.
Wireshark is designed to capture and log the activity on your network in real time, so that you can sort through and analyze the results in your own time. The setup program can be obtained from the Download section of the Wireshark website. If you haven’t done so already, the first thing you’ll need to do is install Wireshark on your testing system.
Here are some tips and best practices, describing how. The utility provides a detailed report on the traffic flowing through your Network Interface Card (NIC), and may be used in benchmarking network performance and troubleshooting network issues. Wireshark is distributed as a free open source packet analyzer.
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