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Packet capture is the process of intercepting and logging traffic. As data streams flow across the network, the analyzer captures each packet and, if needed, decodes the packet's raw data, showing the values of various fields in the packet, and analyzes its content according to the appropriate RFC or other specifications.
Wireshark is a data capturing program that "understands" the structure (encapsulation) of different networking protocols. It can parse and display the fields, along with their meanings as specified by different networking protocols. Wireshark uses pcap to capture packets, so it can only capture packets on the types of networks that pcap supports.
Testing and development of new network protocols (send a packet, see if device behaves appropriately) Reverse-engineering network protocols for security analysis (such as malware) Troubleshooting secure connections (using the SSL server and client). Automation (via Packet Sender's command line interface or resend feature)
tcpdump is a data-network packet analyzer computer program that runs under a command line interface. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. [3] Distributed under the BSD license, [4] tcpdump is free software.
The following tables compare general and technical information for several packet analyzer software utilities, also known as network analyzers or packet sniffers. Please see the individual products' articles for further information.
ngrep, aka "network grep", isolate strings in packets, show packet data in human-friendly output. Nmap, a port-scanning and fingerprinting network utility; Pirni, a discontinued network security tool for jailbroken iOS devices. Scapy, a packet manipulation tool for computer networks, written in Python by Philippe Biondi.
the output as seen while running Nmap from the command line, but saved to a file. Script kiddie meant to be an amusing way to format the interactive output replacing letters with their visually alike number representations. For example, Interesting ports becomes Int3rest1ng p0rtz. This is known as Leet.
The packet injection process allows an unknown third party to disrupt or intercept packets from the consenting parties that are communicating, which can lead to degradation or blockage of users' ability to utilize certain network services or protocols. Packet injection is commonly used in man-in-the-middle attacks and denial-of-service attacks.