![]() Now I think, you can play with the command as per your need. w mypcap.pcap will create that pcap file, which will be opened using wireshark. You can remove this to capture all packets. Port ftp or ssh is the filter, which will capture only ftp and ssh packets. There are occasions when you want to capture packets using tcpdump rather than wireshark, especially when you want to do a remote capture and do not want. Default is eth0, if you not use this option. i eth0 is using to give Ethernet interface, which you to capture. 65535, after this capture file will not truncate. s 0 will set the capture byte to its maximum i.e. tcpdump: Capturing with tcpdump for viewing with Wireshark It’s often more useful to capture packets using tcpdump rather than wireshark. You can use following command to capture the dump in a file: tcpdump -s 0 port ftp or ssh -i eth0 -w mycap.pcap I am writing this post, so that you can create a pcap file effectively. If you do a lot of network capturing it is well worth the effort to learn all the command line switches to TcpDump for the same reason learning VI is. 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. TcpDump lives at TcpDump is also the place where LibPcap lives LibPcap is the standard API and CaptureFile format used by Wireshark and TShark as well as many many other tools.
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