Line Printer Daemon protocol: Difference between revisions

{{Infobox networking protocol|title=Line Printer Daemon|purpose=Submitting print jobs to a remote printer|rfcs=RFC 1179|ports=515<ref name="rfc">{{Cite IETF|title=Line Printer Daemon Protocol|rfc=1179|date=August 1990}}</ref>|date={{Start date and age|1983}}|based on=[[Berkeley printing system]]}}
The '''Line Printer Daemon protocol/Line Printer Remote protocol''' (or '''LPD''', '''LPR''') is a network [[printing protocol]] for submitting print jobs to a remote printer. The original implementation of LPD was in the [[Berkeley printing system]] in the [[BSD]] [[UNIX]] operating system; the [[LPRng]] project also supports that protocol. The [[Common Unix Printing System]] (or CUPS), which is more common on modern [[Linux]] distributions and also found on [[Mac OS XmacOS]], supports LPD as well as the [[Internet Printing Protocol|Internet Printing Protocol (IPP)]]. Commercial solutions are available that also use Berkeley printing protocol components, where more robust functionality and performance is necessary than is available from LPR/LPD (or CUPS) alone (such as might be required in large corporate environments). The LPD Protocol Specification is documented in RFC 1179.<ref>[http://www. name="rfc-editor.org/rfc/rfc1179.txt" RFC1179] Line Printer Daemon Protocol, August 1990, edited by L. McLaughlin III.</ref>

An LPD printer is identified by the [[IP address]] of the server machine and the queue name on that machine. Many different queue names may exist in one LPD server, with each queue having unique settings. Note that the LPD queue name is case sensitive. Some modern implementations of LPD on network printers might ignore the case or queue name altogether and send all jobs to the same printer. Others have the option to automatically create a new queue when a print job with a new queue name is received. This helps to simplify the setup of the LPD server.<ref>[http://gpvno.co.za/ Winet]'s InetLPD server documentation.</ref> Some companies (e.g. D-Link in model DP-301P+) have a tradition of calling the queue name “lpt1” or “LPT1”.