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. Select none in the current column then choose cflow from the list: Select OK to save the selection. Select menu option Analyze->Decode As: Select + in lower left corner to add an entry to the Decode As window. Default is eth0, if you not use this option. Open the packet capture file (.pcap format) in Wireshark. 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. 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. 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.
Tcpdump is a command line network sniffer, used to capture network packets.
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