I am writing this post, so that you can create a pcap file effectively. When you create a pcap file using tcpdump it will truncate your capture file to shorten it and you may not able to understand that. so many other options available, see tcpdump man page.you can directly see the capture of a remote system in any other Linux system using wireshark, for more detail click “ Remote packet capture using WireShark and tcpdump”.you can create filter to capture only required packets like ftp or ssh etc.you can also create a pcap file (to see the capture in wireshark),.you can see the packet dump in your terminal,.When you have only command line terminal access of your system, this tool is very helpful to sniff network packets. You may also use Wireshark capture and analysis tool.Tcpdump is a command line network sniffer, used to capture network packets. 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): tcpdump relies on libcap, therefore it can produce standard pcap analysis files which may be processed by other tools. 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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