You may also use Wireshark capture and analysis tool. To capture all packets from a specific host on the network:
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): Because Wireshark is open source, help desks are not readily available to. Since Wireshark is open source, the cost is free, whether a user wants to use the program for commercial or personal uses. The context of the program is clearly defined, making it an ideal tool for a new packet sniffer to explore. tcpdump relies on libcap, therefore it can produce standard pcap analysis files which may be processed by other tools. Wireshark is also user friendly software. 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.
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