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The finger program was written in 1971 by Les Earnest who created the program to solve the need of users who wanted information on other users of the network. Information on who is logged in was useful to check the availability of a person to meet. This was probably the earliest form of presence information for remote network users.
This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
To enable the forwarding of User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address command in interface configuration mode. To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
Local port forwarding is the most common type of port forwarding. It is used to let a user connect from the local computer to another server, i.e. forward data securely from another client application running on the same computer as a Secure Shell (SSH) client. By using local port forwarding, firewalls that block certain web pages, can be ...
Packet forwarding, the relaying of packets from one network segment to another by nodes in a computer network Forwarding equivalence class, a set of packets with similar or identical characteristics that may be forwarded the same way; Perfect forwarding, a feature of the programming language C++11; Port forwarding, the act of forwarding a ...
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.
The TCP Port Service Multiplexer (TCPMUX) is a little-used Internet protocol defined in RFC 1078. The specification describes a multiplexing service that may be accessed with a network protocol to contact any one of a number of available TCP services of a host on a single, well-known port number .
The command is primarily used to manage network resources. [2] It is an external command implemented as net.exe. [3] When used in a batch file, the /Y or /N switches can be used to unconditionally answer Yes or No to questions returned by the command. [2]