![]() In the wireshark interface, the packet list view is color coded to distinguish between different types of traffic in the capture. ![]() Lastly the Hex and ASCII representation of the selected packet are at the bottom. Wireshark's interface has The list of packets are up top, followed by the layered representation of a selected packet from the list. In this case it would match a query parameter from a URL searching for Wireshark. This filter string would locate packets in our capture that contain a a URL request that has the specified string within it. This allows filter rules like finding HTTP requests with specific strings in the URL, which would look like, matches "q=wireshark". Wireshark's understanding of application level protocols even extends to its filter strings. It can identify and extract data payloads from file transfers through protocols like SMB or HTTP. While tcpdump can do basic analysis of some types of traffic, like DNS queries and answers, Wireshark can do decode encrypted payloads if the encryption key is known. ![]() Wireshark is s way more extensible when it comes to protocol and application analysis. Wireshark is a graphical utility that also uses the libpcap library for capture and interpretation of packets. Wireshark is another packet capture and analysis tool that you can use, but it's way more powerful when it comes to application and packet analysis, compared to tcpdump. The view tcpdump gives us lets us see the data that fits into the various fields that make up the headers for layers in a packet. They represent information depending on the values of this data, and where they appear in the data stream. packets are just collections of data, or groupings of ones and zeros. This is represented as hexadecimal digits, by using the -x flag, or capital X if you want the hex in ASCII interpretation of the data. With tcpdump it is also possible to view the raw data the makes up the packet You could override this behavior with a -n flag. Tcpdump, by default, will attempt to resolve host addresses to host names tcpdump will also replace port numbers with commonly associated services that use these ports.
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