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Tcpkill is a network utility program that can be used to terminate connections to or from a particular host, network, port, or combination of all. These programs take standard Berkeley Packet Filter (BPF) filters. This can be used for both port mirroring and ARP spoofing. [1]
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 ...
The end user would choose Community ports or both Open and Community ports. If the end user chooses Community ports only, the end user could then decide to allow all IP's from foreign countries or just the IP's from compliant countries or no foreign IP's, all of this configuration would happen at the ISP level.
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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.
It is available as free software under the GNU General Public License and currently runs under both Linux and OS X. [4] The program, when installed, prompts the user to create a whitelist of devices that are allowed to connect to the computer via its USB ports, which it checks at an adjustable sample rate.
In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s).
The remote shell (rsh) is a command-line computer program that can execute shell commands as another user, and on another computer across a computer network.. The remote system to which rsh connects runs the rsh daemon (rshd).