TELNET

Specialty Definition: TELNET

Domain	Definition
Computing	TELNET /tel'net/ 1. The Internet standard protocol for remote login. Runs on top of TCP/IP. Defined in STD 8, RFC 854 and extended with options by many other RFCs. Unix BSD networking software includes a program, telnet, which uses the protocol and acts as a terminal emulator for the remote login session. Sometimes abbreviated to TN. TOPS-10 had a similar program called IMPCOM. 2. The US nationwide network into which one dials to access CompuServe. It was created by John Goltz, one of the founders and system guru of CompuServe. He later worked for Tymshare, one of CompuServe's big competitors. [Jargon File]. Source: The Free On-line Dictionary of Computing.
Source: compiled by the editor from various references; see credits.

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Specialty Definition: Telnet

(From Wikipedia, the free Encyclopedia)

Telnet is a network protocol used on the Internet. IETF document STD 8 (aka RFC 854 and RFC 855) starts:

The purpose of the TELNET Protocol is to provide a fairly general, bi-directional, eight-bit byte oriented communications facility.

It is typically used to provide user oriented command line login sessions between hosts on the internet.

By extension, telnet is also the name of a program that a user can use to invoke a Telnet session to a remote host; the telnet program provides the client part of the protocol. Telnet clients have been available on most Unix systems for many years, and are available for virtually all types of computers.

"To telnet" is also used as a verb meaning to establish or use such a connexion, as in, "If you need to change your password you need to telnet to the server and run the passwd command".

Protocol details

Telnet is a client-server protocol, based on TCP, and clients generally connect to port 23 on the host providing the service (though like many protocols in use on the Internet which port to use is fairly easy to change). Partly because of the design of the protocol and partly because of the flexibility typically provided by telnet programs, it is also possible to use a Telnet program to establish an interactive TCP connection to some other service on an internet host. A classic use of this is telnetting to port 25 (where typically an SMTP server is to be found) to debug a mail server.

The Telnet protocol can be divided into a core and a set of extensions. The core protocol is described by IETF documents RFC 854 and RFC 855 which are also collected together in STD 8. STD 8 defines fairly basic operating characteristics of the protocol and a means of defining and implementing extensions. There are many extensions, some of which have been adopted as Internet Standards, some of which haven't. IETF STD document numbers from 27 through to 32 define various Telnet extensions (most of which are extremely common). Of the remaining extensions the most useful ones are probably those that are on the IETF standards track as proposed standards; details can be found in STD 1.

Security

There are three main problems with Telnet, making it a bad choice for modern systems from the point of view of security:

Commonly used telnet daemons have several vulnerabilities discovered over the years, and probably several more still exist.
Telnet does not encrypt any data send over the connection (including passwords), and so it is trivial to eavesdrop on the communications and use the password later for malicious purposes.
Telnet lacks an authentication scheme that makes it possible to ensure that communication is carried out between the two desired hosts, and not intercepted in the middle.

In environments where security is important, such as on the public Internet, telnet should not be used. Telnet sessions are unencrypted. This means that anybody who has access to any router, switch, or gateway located on the network between the two hosts where telnet is being used can intercept the telnet packets passing by and easily obtain login and password information (and whatever else is typed) with any of several common utilities like tcpdump and Ethereal.

These flaws have seen the usage of the Telnet protocol drop rapidly in favor of a more secure and functional protocol called SSH, released in 1998. SSH provides all functionality present in telnet, with the addition of strong encryption to prevent sensitive data such as passwords from being intercepted, and public key authentication, to ensure that the remote computer is actually who it claims to be.

Experts in Computer Security, such as SANS, and the members of the comp.os.linux.security newsgroup recommend that the use of Telnet for remote logins should be discontinued under all normal circumstances.

When telnet was being developed in the early 1980s, most users of networked computers were in the computer departments of academic institutions, or at large private and government research facilities. In this environment, security was not nearly as much of a concern as it became after the bandwidth explosion of the 1990s. With the exponential rise in the number of people with access to the Internet, and by extension, the number of people attempting to crack into other people's servers, telnet should generally not ever be used on networks with Internet connectivity.

Telnet clients are still occasionally used to manually "talk" to other services. It is sometimes used in debugging network services such as an SMTP server, by serving as a simple way to send commands to the server and examine the responses.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Telnet."

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Abbreviations & Acronyms: TELNET

The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted.
Entry	Source	Expression	Field
TELNET	English	Telecommunications Network	N/A
Source: compiled by the editor, based on several corpora (additional references).

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Crosswords: TELNET

Specialty definitions using "TELNET": 404 ♦ Advanced Research Projects Agency Network ♦ Compressed SLIP, Compulink Information eXchange ♦ Gopher object type ♦ IBM 3270, Institute of Electrical and Electronics Engineers, Inc., Internet Adapter ♦ Knowbot Information Service ♦ LambdaMOO, leapfrog attack ♦ Minnesota Internet Users Essential Tool, mouse around ♦ netlag ♦ remote login, RFC 854, rlogin ♦ Secure Sockets Layer, Simple Mail Transfer Protocol, SOCKS ♦ TCPIP, TelEnet, tn3270 ♦ U-NET Limited ♦ warez, Wide Area Information Servers, world-wide web. (references)

Non-English Usage: "TELNET" is also a word in the following language with the English translation in parentheses.

Portuguese (TELNET).

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Commercial Usage: TELNET

Domain	Title
High Tech	Osicom Standalone 56K/64K Csu/Dsu Snmp Telnet V.35 Dte Rs-232 115 Vac (reference) Rumba 2000 Telnet Edition 6.0 (reference) RUMBA TELNET ED. 7.1 CARD 1U (reference) Rumba Telnet Editon 7.1 1-user License (reference) (more camera examples; more video game examples; more computer examples; more electronic examples; more software examples)
Source: compiled by the editor from various references; see credits.

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Non-Fiction Usage: TELNET

Subject	Topic	Quote
Business		The majority of the small and medium-sized companies use free-software security applications such as TNP, Eudora and Telnet but these are no longer safe enough. (references)
		By deploying GPRS, Internet connections through mobile gateways is fully enabled and services such as File Transfer Protocol (FTP), web browsing, chat rooms, email, and telnet, will be available over the mobile network. (references)
Economic History	Burma	For Internet access, the address for use with the World Wide Web (Home Page), Telnet, or FTP protocol is: fedbbs.access.gpo.gov. The document is also accessible for downloading in ASCII format without charge from Treasury's Electronic Library ("TEL") in the "Business, Trade and Labor Mall" of the FedWorld bulletin board. (references)
Source: compiled by the editor from ICON Group International, Inc.; see credits.

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Expression: TELNET

Hyphenated Usage
	Beginning with "TELNET": telnet-derived.
Source: compiled by the editor from various references; see credits.

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Frequency of Internet Keywords: TELNET

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.

Expression	Frequency per Day	Expression	Frequency per Day
telnet	2,596	linux telnet	19
telnet client	391	java telnet applet	17
chat rooms telnet	169	midwest telnet	17
telnet server	133	free telnet client	16
telnet command	113	window telnet	16
putty telnet	56	using telnet	15
ssh telnet	48	192.168.1.1 telnet	14
use telnet	42	script telnet	14
telnet java	31	free server telnet	14
telnet port	31	telnet xp	13
telnet download	30	nt telnet	13
free telnet	30	telnet mac	13
telnet tutorial	28	dos telnet	12
telnet protocol	27	es que telnet	12
absolute telnet	24	free ware telnet	12
telnet software	23	telnet bbs	12
secure telnet	22	pc pocket telnet	11
telnet program	21	game telnet	11
telnet site	21	telnet help	11
telnet towel.blinkenlights.nl	20	192.168.0.1 telnet	11
Source: compiled by the editor from various references; see credits.

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Modern Translation: TELNET

Language		Translations for "TELNET"; alternative meanings/domain in parentheses.
Chinese		远程通信网. (various references)

Danish		TELNET-protokol, Telnet. (various references)

Dutch		TELNET. (various references)

Finnish		Telnet-protokolla, Telnet-emulointiprotokolla. (various references)

French		Telnet, protocole Telnet. (various references)

German		TELNET. (various references)

Greek		TELNET. (various references)

Korean		�"넷트. (various references)

Pig Latin		elnettay

Portuguese		TELNET, protocolo TELNET. (various references)

Spanish		Telnet. (various references)
Source: compiled by the editor from various translation references.

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Derivations & Misspellings: TELNET

Derivations
	Words beginning with "TELNET": telneted, telneting, telnets, telnetted, telnetting. (additional references)
Misspellings
	"TELNET" is suggested in spellcheckers for the following: Elsnet, talnet, tealent, Tefnut, tegnet, telant, telen, telenet, telent, telne, Tilne, tonlet, Tselane, tymnet. (additional references)
Source: compiled by the editor, based on several corpora (additional references).

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Anagrams: TELNET

Scrabble® Enable2K-Verified Anagrams
	Direct Anagrams: nettle.
	Words within the letters "e-e-l-n-t-t"
	-1 letter: tenet.
	-2 letters: leet, lent, nett, teel, teen, tele, tent.
	-3 letters: eel, lee, let, nee, net, tee, tel, ten, tet.
	-4 letters: el, en, et, ne.
	Words containing the letters "e-e-l-n-t-t"
	+1 letter: entitle, lunette, nettled, nettler, nettles, telnets.
	+2 letters: betelnut, entitled, entitles, gentlest, lunettes, mantelet, nettable, nettlers, nettlier, talented, telethon, telneted, tentacle, tentless, tentlike, unletted, unsettle.
	+3 letters: alternate, antielite, betelnuts, cattlemen, englutted, extolment, flattened, flattener, gantleted, gestalten, intellect, interlent, leptotene, lettering, letterman, lettermen, lorgnette, mantelets, nettliest, novelette, pestilent, reletting, silentest, tegmental, telethons, telneting, telnetted, tentacled, tentacles, ternately, tervalent, unsettled, unsettles, ventilate.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.

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INDEX

1. Crosswords
2. Usage: Commercial
3. Quotations: Non-fiction
4. Expressions

5. Expressions: Internet
6. Translations: Modern
7. Abbreviations
8. Acronyms

9. Derivations
10. Anagrams
11. Bibliography

TELNET

Specialty Definition: TELNET

Specialty Definition: Telnet

Abbreviations & Acronyms: TELNET

TELNET

Crosswords: TELNET

Commercial Usage: TELNET

High Tech

Non-Fiction Usage: TELNET

Expression: TELNET

Frequency of Internet Keywords: TELNET

Modern Translation: TELNET

Chinese

Danish

Dutch

Finnish

French

German

Greek

Korean

Pig Latin

Portuguese

Spanish

Derivations & Misspellings: TELNET

Derivations

Misspellings

Anagrams: TELNET

Scrabble® Enable2K-Verified Anagrams

INDEX