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You may also use Wireshark capture and analysis tool.

This helps network administrators generate statistics based on real-time data. To capture all packets from a specific host on the network: The information collected through Wireshark can be utilized for various purposes, such as real-time or offline network analysis, identification of the traffic coming into your network, its frequency, and its latency between specific hops. Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode To capture all packets on the WAN (the below assumes that interface eth1 is the WAN interface): You can start Wireshark in the background using the following command: In the startup window of Wireshark, you should see the following screen. Now, we are all set to capture wireless packets. tcpdump relies on libcap, therefore it can produce standard pcap analysis files which may be processed by other tools. Step 4: Launch Wireshark and Start Capturing. It may be used to capture packets on the fly and/or save them in a file for later analysis. Tcpdump is a network capture and analysis tool.