Line Printer Daemon protocol
The Berkeley Printing System consists of network protocols and software to send print jobs on the network can, so therefore constitutes a printer server in Software Represents the Line Printer Daemon Protocol ( LPDP ) is described in RFC 1179. The default port for this service is 515 It was originally developed for Unix, but is at least implemented on other platforms at the protocol level.
With the command line program lpr a print job is queued via a TCP connection. The individual printer queues are assigned, they can be connected via local interfaces or again refer to a remote lpd compatible print server. The Line Printer Daemon print jobs from working according to the configuration.
The configuration takes place under Unix in the / etc / printcap file instead. There parameters such as local or remote interfaces, the spool directory, etc. are set.
Based on source address can be a rudimentary access control can be set for the entire print server service (on UNIX / etc / hosts.lpd ). Also can be forced that print jobs are accepted only if a user with the same name on the remote print server system exists.
In the Microsoft Windows operating system is called the Implementation Print Services for UNIX. Remote printers as LPR Port (Line Printer Remote) integrated and treated as local printers.