p910nd is a small printer daemon intended for diskless workstations that does not spool to disk but passes the job directly to the printer. Normally a lpr daemon on a spooling host connects to it with a TCP connection on port 910n (where n=0, 1, or 2 for lp0, 1 and 2 respectively). p910nd is particularly useful for diskless Linux workstations booted via Etherboot that have a printer hanging off them. Common Unix Printing System (CUPS) supports this protocol, it's called the AppSocket protocol and has the scheme socket://. LPRng also supports this protocol and the syntax is lp=remotehost%9100 in /etc/printcap.
Here is the man page.
Version 0.8 allows binding to a specified IP address.
Version 0.7 supports bidirectional copying, activated with the -b option, useful for getting status from printers.
Version 0.6 has minor cleanups by Arne Bernin.
Version 0.5 adds support for libwrap (tcpwrappers) so that the server can be more selective about who can connect to it.
I haven't really been keeping track but projects that have adopted it include the 3.x versions of LTSP, although for unexplained reasons they renamed the software, and many embedded router projects. Here's a LRP based print server use.Last updated 2005-11-10 by Ken Yap