• This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C library for network traffic capture. In this page, you'll find the latest stable version of tcpdump and libpcap, as well as current development snapshots, a complete documentation, and information about how to report bugs.
• This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C library for network traffic capture. In this page, you'll find the latest stable version of tcpdump and libpcap, as well as current development snapshots, a complete documentation, and information about how to report bugs or contribute patches.
• Packets ‘‘captured’’ (this is the number of packets that tcpdump has received and processed). Packets ‘‘received by filter’’ (the meaning of this depends on the OS on which you’re running tcpdump, and possibly on the way the OS was configured - if a filter was specified on the command line, on some OSes it counts packets regardless of whether they were matched by the filter.

Check tutorial of How to Read .cap Packet Capture File on Mac OS X with tcpdump

Packets ``dropped by kernel' (this is the number of packets that were dropped, due to a lack of buffer space, by the packet capture mechanism in the OS on which tcpdump is running, if the OS reports that information to applications; if not, it will be reported as 0).

So after a lot of requests from our users here is a guide about How to Read .cap Packet Capture File on Mac OS X with tcpdump.

Whether you are running a packet trace or sniffing and capturing packets from a network, the result is usually creating a .cap capture file. That .cap, pcap, or wcap packet capture file is created regardless of what you’re using to snoop a network, a fairly common task among network administrators and security professionals. Perhaps the easiest way to open, read, and interpret a .cap file is to use the built-in tcpdump utility on a Mac or Linux machine.

Assuming you’ve already captured a network connection packet trace and created a captured package file with a .cap, .pcap, or .wcap extension from tcpdump, Wirehark, Airport, Wireless Diagnostics Sniffer tool, or any other network utility all you need to do to view the .cap file is run Terminal in OS X * and then type the following command string, tweaking the syntax as needed:

tcpdump -r /path/to/packetfile.cap

Usually a .cap file is quite large so it is best to pipe the .cap file to less or more for scanning, we use less:

tcpdump -r /path/to/packetfile.cap | less

For example, let’s say there is a capture file at /tmp/airportSniff8471xEG.cap generated by monitoring a local wifi network using the fantastic airport command line utility, the syntax would be:

tcpdump -r /tmp/airportSniff8471xEG.cap | less

The file can be easily scanned, interpreted, read, moved, searched or whatever you want to do with it. We won’t be going into details about the type of data in the .cap files and what to do with it in this walkthrough, but even if you’re not in systems or network administration, it can still be an enlightening if not interesting experience.

If you have ever tried to use cat in a .cap file you know it will result in a lot of gibberish which will be annoying up the Terminal often requires a Terminal reset to clear the gibberish on the screen. While there are many third-party apps out there to interpret and read .cap files, with the ability to do this natively in the command line, there’s generally little reason to buy another app just to get a committed package file to scan.

* We’re clearly focusing on reading .cap files in Mac OS X here, but the tcpdump command also exists on just about every version of Linux out there, making this an almost universal command line tool for many types of Unix. Just something to keep in mind.

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