When you enable this option, you’ll see domain names instead of IP addresses whenever possible. Now I think, you can play with the command as per your need.Wireshark can automatically resolve these IP address to domain names, although this feature isn’t enabled by default. 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.
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