The Line Printer Daemon protocol/Line Printer Remote protocol (or LPD, LPR) is a network

printing protocol A printing protocol is a protocol for communication between client devices (computers, mobile phones, tablets, etc.) and printers (or print servers). It allows clients to submit one or more print jobs to the printer or print server, and perform ta ...

for submitting print jobs to a remote printer. The original implementation of LPD was in the

Berkeley printing system {{Unreferenced, date=March 2010 The Berkeley printing system is one of several standard architectures for printing on the Unix platform. It originated in 2.10BSD, and is used in BSD derivatives such as FreeBSD, NetBSD, OpenBSD, and DragonFly BSD. ...

in the

BSD The Berkeley Software Distribution or Berkeley Standard Distribution (BSD) is a discontinued operating system based on Research Unix, developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Be ...

UNIX operating system; the

LPRng LPRng is a printing system compatible with the Berkeley printing system. It provides printer spooling and network print server functionality using the Line Printer Daemon protocol. It is an open-source project hosted on SourceForge and implemented ...

project also supports that protocol. The

Common Unix Printing System CUPS (formerly an acronym for Common UNIX Printing System) is a modular computer printer, printing system for Unix-like computer operating systems which allows a computer to act as a print server. A computer running CUPS is a Server (computi ...

(or CUPS), which is more common on modern

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which i ...

distributions and also found on

Mac OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...

, supports LPD as well as the 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.

Usage

A server for the LPD protocol listens for requests on TCP port 515. A request begins with a byte containing the request code, followed by the arguments to the request, and is terminated by an ASCII LF character. An LPD printer is identified by the

IP address An Internet Protocol address (IP address) is a numerical label such as that is connected to a computer network that uses the Internet Protocol for communication.. Updated by . An IP address serves two main functions: network interface ident ...

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.Winet
s InetLPD server documentation. Some companies (e.g. D-Link in model DP-301P+) have a tradition of calling the queue name “lpt1” or “ LPT1”. A printer that supports LPD/LPR is sometimes referred to as a "TCP/IP printer" (

TCP/IP The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...

is used to establish connections between printers and clients on a network), although that term would be equally applicable to a printer that supports the

Internet Printing Protocol The Internet Printing Protocol (IPP) is a specialized Internet protocol for communication between client devices (computers, mobile phones, tablets, etc.) and printers (or print servers). It allows clients to submit one or more print jobs to the pr ...

References

External links

FreeBSD LPD Man Page
Computer printing Printing protocols Unix {{Network-software-stub

Usage

See also

References

External links