Telnet: Difference between revisions
imported>Howard C. Berkowitz (New page: '''Telnet''' is a basic Internet protocol that simulates the functionality of a character-by-character terminal, running over the Transmission Control Protocol. Even in a Web era, ...) |
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'''Telnet''' is a basic [[Internet]] protocol that simulates the functionality of a character-by-character terminal, running over the [[Transmission Control Protocol]]. Even in a Web era, it remains important for accessing maintenance interfaces on network infrastructure. | '''Telnet''' is a basic [[Internet]] protocol that simulates the functionality of a character-by-character terminal, running over the [[Transmission Control Protocol]]. Even in a Web era, it remains important for accessing maintenance interfaces on network infrastructure. | ||
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Since Internet application protocols are usually character-based, it can be used to test a variety of application protocols; "telnetting to Port 25", for example, allows [[Simple Mail Transfer Protocol]] messages to be constructed at a window and sent to the SMTP server. | Since Internet application protocols are usually character-based, it can be used to test a variety of application protocols; "telnetting to Port 25", for example, allows [[Simple Mail Transfer Protocol]] messages to be constructed at a window and sent to the SMTP server. | ||
Do not confuse Telnet with [[Telenet]], the name of an early commercial [[X.25]] network. | |||
Revision as of 00:55, 6 February 2009
Telnet is a basic Internet protocol that simulates the functionality of a character-by-character terminal, running over the Transmission Control Protocol. Even in a Web era, it remains important for accessing maintenance interfaces on network infrastructure.
Reverse telnet, in which a virtual window can speak to a number of serial interfaces through an appropriate application gateway, is a common means of accessing the consoles of multiple colocated routers or other network elements.
The well-known TCP port for Telnet is numbered 23. Most Telnet clients can go to alternate ports, and a Telnet server can redirect the session to a different address and port.
Since Internet application protocols are usually character-based, it can be used to test a variety of application protocols; "telnetting to Port 25", for example, allows Simple Mail Transfer Protocol messages to be constructed at a window and sent to the SMTP server.
Do not confuse Telnet with Telenet, the name of an early commercial X.25 network.