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Summary
Historically, Linux systems have used the BSD
LPD printing system, but this system is showing its age. Various alternatives
exist to this system, and Linux distributions are increasingly using
themusually LPRng or CUPS. These alternatives offer improved access control
mechanisms and other features. CUPS, in particular, offers an improved ability
to interact with printing applications in order to convey printer-specific
features to the applications, and a Web-based configuration tool for print
client configuration.Security should be a concern on any computer
that functions as a print server. Ideally, you should use packet filter
firewall rules to block access to ports 515 and 631 (the LPD and IPP printing
ports, respectively) to any but authorized hosts, and use access control
features specific to each printing tool as a redundant measure. LPRng offers
the best control over LPD printing mechanisms, while CUPS offers good control
over IPP tools.
