In this environment, security was not nearly as much a concern as it became after the bandwidth explosion of the 1990s. Template:Unreferenced section When Telnet was initially developed in 1969, most users of networked computers were in the computer departments of academic institutions, or at large private and government research facilities. Some extensions have been widely implemented and others are proposed standards on the IETF standards track (see below) On March 5, 1973, a Telnet protocol standard was defined at UCLA with the publication of two NIC documents: Telnet Protocol Specification, NIC #15372, and Telnet Option Specifications, NIC #15373.īecause of negotiable options protocol architecture, many extensions were made for it, some of which have been adopted as Internet standards, IETF documents STD 27 through STD 32. Any byte with the high bit set was a special Telnet character. Essentially, it used an 8-bit channel to exchange 7-bit ASCII data. Telnet, however, predates TCP/IP and was originally run over Network Control Program (NCP) protocols.īefore March 5, 1973, Telnet was an ad-hoc protocol with no official definition. Typically this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening. Telnet is a client-server protocol, based on a reliable connection-oriented transport. For example, a common directive might be: " To change your password, telnet to the server, log in and run the passwd command." Most often, a user will be telnetting to a Unix-like server system or a network device (such as a router) and obtain a login prompt to a command line text interface or a character-based full-screen manager. To telnet means to establish a connection with the Telnet protocol, either with command line client or with a programmatic interface. Telnet client applications are available for virtually all computer platforms. The term telnet may also refer to the software that implements the client part of the protocol. Because of security issues with Telnet, its use for this purpose has waned in favor of SSH. Most network equipment and operating systems with a TCP/IP stack support a Telnet service for remote configuration (including systems based on Windows NT). Historically, Telnet provided access to a command-line interface (usually, of an operating system) on a remote host. Telnet was developed in 1969 beginning with RFC 15, extended in RFC 854, and standardized as Internet Engineering Task Force (IETF) Internet Standard STD 8, one of the first Internet standards. User data is interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over the Transmission Control Protocol (TCP). Template:Distinguish Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.
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