DISCARD

DISCARD

The DISCARD protocol is an Internet protocol defined in RFC 863. It is intended for testing and measurement purposes.

A host may send data to a host that supports the DISCARD protocol, on either TCP or UDP port 9. Everything sent to the server is discarded. No response is sent back.

Inetd implementation of DISCARD

On Linux, FreeBSD, and other UNIX-like operating systems a discard server is built into the inetd daemon. The discard service is usually not enabled by default. It may be enabled by adding the following lines to the file /etc/inetd.conf and telling inetd to reload its configuration: discard stream tcp nowait root internal discard dgram udp wait root internal

Examples of use

* The TCP/UDP equivalent of /dev/null. Such a service is guaranteed to receive what is sent to it and can be used for debugging TCP and/or UDP code requiring a guaranteed reception of payload sent.

See also

* List of well-known ports
* Echo protocol
* DAYTIME
* CHARGEN
* TIME

External links

* RFC 348, The Discard process
* RFC 863, The Discard protocol


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  • Discard — im TCP/IP‑Protokollstapel: Anwendung Discard Transport UDP TCP Internet IP (IPv4, IPv6) Netzzugang Ethern …   Deutsch Wikipedia

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  • discard — vb Discard, cast, shed, molt, slough, scrap, junk mean to get rid of as of no further use, value, or service. Discard literally denotes the getting rid of a card from one s hand in a card game, usually because they are worthless or can be… …   New Dictionary of Synonyms

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  • Discard — Dis*card , v. t. [imp. & p. p. {Discarded}; p. pr. & vb. n. {Discarding}.] 1. (Card Playing) To throw out of one s hand, as superfluous cards; to lay aside (a card or cards). [1913 Webster] 2. To cast off as useless or as no longer of service; to …   The Collaborative International Dictionary of English

  • Discard — Dis*card , v. i. (Card Playing) To make a discard. [1913 Webster] …   The Collaborative International Dictionary of English

  • discard — [dis kärd′; ] for n. [ dis′kärd΄] vt. [OFr descarter, prob. < des + carte: see DIS & CARD1] 1. Card Games a) to remove (a card or cards) from one s hand b) to play (a card not a trump and not in the suit led) when holding no cards in the suit… …   English World dictionary

  • Discard — Dis*card , n. (Card Playing) The act of discarding; also, the card or cards discarded. [1913 Webster] …   The Collaborative International Dictionary of English

  • discard — I noun castaway, castoff, debris, declasse, derelict, detritus, evacue, foundling, leaving, oddment, proscrit, reject, remainder, remnant, waste II index abandon (relinquish) …   Law dictionary

  • discard — (v.) 1590s, lit. to throw a card away, from DIS (Cf. dis ) away + CARD (Cf. card) (n.). Figurative use (in a non gaming sense) is first recorded 1580s. In the card playing sense, decard is attested by 1550s. Related: Discarded; discarding. As a… …   Etymology dictionary

  • discard — [v] get rid of abandon, abdicate, abjure, adios*, banish, can*, cancel, cashier, cast aside, chuck, deep six*, desert, dispatch, dispense with, dispose of, dispossess, ditch, divorce, do away with, drop, dump, eject, eliminate, expel, forsake,… …   New thesaurus

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