User`s guide

2-47
Printers, Print Jobs, and Queues for Systems Administrators
Remote Printing Overview
Remote printing allows different computers to share printers. To use remote printing
facilities, the computers must be connected via the Transmission Control Protocol/Internet
Protocol (TCP/IP) protocol and must support the required TCP/IP applications, such as the
lpd daemon.
A remote print request is queued in the same manner as a local print request:
• A front–end print command such as qprt, lpr, or enq initiates the request to the
appropriate queue on the local system.
• The qdaemon on the local system processes the request as it would any locally queued
job, with one exception. The qdaemon passes the request to the rembak backend
program rather than the piobe backend.
• The rembak program transmits the print job to a remote server via the TCP/IP network.
• On the remote server the lpd daemon monitors port 515 for remote print requests.
• When the lpd receives a remote print request, it places the job in the appropriate local
queue.
• The print request is then processed by the qdaemon on the print server.
• The qdaemon passes the request to the piobe backend on the print server.
• The piobe backend formats the data stream for printing on the specified printer.
The following figure shows how remote printing requests are handled:
Iago Prorq
piobe rembak
remote
backend
local
backend
qdaemon
to
local
printer
rq
piobe
local
backend
qdaemon
to local
printer
lpd
daemon
local
queue
local
queue
TCP/IP
Network
Flow of a Remote Print Request
lpr –h –P rq FileName
(Typical print command)