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. 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. 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. Exercise1: Good Old Telnet File telnet.pcap Question Reconstruct the telnet session.

• so many other options available, see tcpdump man page. tcpdump -i -s 65535 -w Exercise Install Wireshark into your PC Run wireshark and Capture inbound/outbound traffic Download capture files from Follow the instructors guide.

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.

Wireshark pcap file