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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.
tcpdump prints the contents of network packets. It can read packets from a network interface card or from a previously created saved packet file. tcpdump can write packets to standard output or a file. It is also possible to use tcpdump for the specific purpose of intercepting and displaying the communications of another user or computer.
libpcap was originally developed by the tcpdump developers in the Network Research Group at Lawrence Berkeley Laboratory.The low-level packet capture, capture file reading, and capture file writing code of tcpdump was extracted and made into a library, with which tcpdump was linked. [8]
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.
Packet crafting is a technique that allows network administrators to probe firewall rule-sets and find entry points into a targeted system or network. This is done by manually generating packets to test network devices and behaviour, instead of using existing network traffic. [1]
This basic example includes the three most fundamental packet processing functions, packetization, routing, and assembly. Packet processing functions range from the simple to highly complex. As an example, the routing function is actually a multi-step process [17] involving various optimization algorithms and table lookups. A basic routing ...
Present if the C bit is set; contains the checksum for the GRE header and payload. Reserved 1 (16 bits) Present if the C bit is set; is set to 0. Key (32 bits) Present if the K bit is set; contains an application-specific key value. Sequence Number (32 bits) Present if the S bit is set; contains a sequence number for the GRE packet.
It provides a raw interface to data link layers, permitting raw link-layer packets to be sent and received, [1] and allows a userspace process to supply a filter program that specifies which packets it wants to receive. For example, a tcpdump process may want to receive only packets that initiate a TCP connection. BPF returns only packets that ...