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cups-lpd(8) Apple Inc. cups-lpd(8)
NAME
cups-lpd - receive print jobs and report printer status to lpd clients
SYNOPSIS
cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]
DESCRIPTION
cups-lpd is the CUPS Line Printer Daemon ("LPD") mini-server that supports legacy client systems that use the LPD protocol. cups-lpd does
not act as a standalone network daemon but instead operates as a socket-activatable systemd(1) service.
OPTIONS
-h hostname[:port]
Sets the CUPS server (and port) to use.
-n
Disables reverse address lookups; normally cups-lpd will try to discover the hostname of the client via a reverse DNS lookup.
-o name=value
Inserts options for all print queues. Most often this is used to disable the "l" filter so that remote print jobs are filtered as
needed for printing; the examples in the previous section set the "document-format" option to "application/octet-stream" which forces
autodetection of the print file format.
PERFORMANCE
cups-lpd performs well with small numbers of clients and printers. However, since a new process is created for each connection and since
each process must query the printing system before each job submission, it does not scale to larger configurations. We highly recommend
that large configurations use the native IPP support provided by CUPS instead.
SECURITY
cups-lpd currently does not perform any access control based on the settings in cupsd.conf(5) or in the hosts.allow(5) or hosts.deny(5)
files used by TCP wrappers. Therefore, running cups-lpd on your server will allow any computer on your network (and perhaps the entire
Internet) to print to your server.
You should use configure the firewall to limit TCP port 515 access to only those computers that should be able to print through your
server.
cups-lpd is not enabled by the standard CUPS distribution. Please consult with your operating system vendor to determine whether it is
enabled on your system.
COMPATIBILITY
cups-lpd does not enforce the restricted source port number specified in RFC 1179, as using restricted ports does not prevent users from
submitting print jobs. While this behavior is different than standard Berkeley LPD implementations, it should not affect normal client
operations.
The output of the status requests follows RFC 2569, Mapping between LPD and IPP Protocols. Since many LPD implementations stray from this
definition, remote status reporting to LPD clients may be unreliable.
SEE ALSO
cups(1), cupsd(8), systemd(1), http://localhost:631/help
COPYRIGHT
Copyright 2007-2013 by Apple Inc.
4 August 2008 CUPS cups-lpd(8)
