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netstat. In computing, netstat (network statistics) is a command-line network utility that displays network connections for Transmission Control Protocol (both incoming and outgoing), routing tables, and a number of network interface (network interface controller or software-defined network interface) and network protocol statistics.
License. NPSL [3] or modified GPLv2 [4] or proprietary. Website. nmap.org. Nmap (Network Mapper) is a network scanner created by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich). [5] Nmap is used to discover hosts and services on a computer network by sending packets and analyzing the responses.
netcat. netcat (often abbreviated to nc) is a computer networking utility for reading from and writing to network connections using TCP or UDP. The command is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and investigation ...
RFC 697 - CWD Command of FTP. RFC 959 - File Transfer Protocol (FTP) RFC 1639 - FTP Operation Over Big Address Records (FOOBAR) RFC 2228 - FTP Security Extensions. RFC 2389 - Feature negotiation mechanism for the File Transfer Protocol. RFC 2428 - FTP Extensions for IPv6 and NATs. RFC 2640 - Internationalization of the File Transfer Protocol.
The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...
ngrep (network grep) is a network packet analyzer written by Jordan Ritter.It has a command-line interface, and relies upon the pcap library and the GNU regex library.. ngrep supports Berkeley Packet Filter logic to select network sources or destinations or protocols, and also allows matching patterns or regular expressions in the data payload of packets using GNU grep syntax, showing packet ...
Port knocking is a flexible, customisable system add-in. If the administrator chooses to link a knock sequence to an activity such as running a shell script, other changes such as implementing additional firewall rules to open ports for specific IP addresses can easily be incorporated into the script. Simultaneous sessions are easily accommodated.
In active mode, the client starts listening for incoming data connections from the server on port M. It sends the FTP command PORT [10] M to inform the server on which port it is listening. The server then initiates a data channel to the client from its port 20, the FTP server data port.