I have been testing some of the new "features" in Leopard, and I cant
quite figure out exactly what some of the CUPS options do. If you look
at the venerable CUPS 1.3.1 web admin interface (located at 127.0.0:631)
you will see a few new settings. Can you explain what these mean exactly?
*1) "Show printers shared by other systems" (Enabled by default in Leopard)
*
I have toggled this on and off (and rebooted) and I don't see any
difference in terms of what network printers I can see (i.e.; discover).
I have Windows 2003 print servers hosting AD published print queues, a
Leopard print server hosting a queue via IPP/Bonjour and several
Bonjour-enabled HP printers directly attached to my LAN, and the CUPS
check box to "Show printers shared by other systems" Doesn't affect /any
/of these services as far as I can tell. What /exactly /does it do?
It basically controls whether (automatically-discovered) shared
printers are visible, although on Mac OS X the CUPS protocol is
disabled for discovery by default which makes this check box do
nothing.
"cupsctl BrowseRemoteProtocols=cups" to re-enable CUPS printer
discovery, in conjunction with that box being checked.
*2) “Show published printers connected to this system” (Disabled by
default in Leopard)
*
Im not sure what “published” and “connected” mean in this context:
"Published" means you are sharing a particular printer.
"Connected" means you are hosting the printer - it is connected
via USB, parallel, serial, firewire, or some direct network
connection, and your system actually generates the print data
(vs. the PDF or PostScript file produced by the application)
I agree this wording is confusing, and in CUPS 1.4 we'll be
simplifying it.
The reason for the current wording has to do with how this page
interacts with the printer and class pages, which couldn't show
"share this printer" since we had no way of turning on printer
sharing or knowing if it was turned on. Users would then share
the printer on the printer's page, only to discover that the
printer wasn't yet shared because printer sharing wasn't enabled.
When CUPS says “published”, does that mean print queues published via AD
or OD for example?
No, it means the printer will be shared via whatever protocols you
have enabled, and corresponds to the "share this printer" check box
in the Print & Fax pref pane.
When CUPS says “connected” does it mean physically connected (i.e.; USB,
etc) or does it mean logically “mapped” to a network printer/queue?
It can be physically connected or used directly over a network
connection, e.g. JetDirect or other print server/network card in
the printer.
*3) “Allow printing from the Internet” (Disabled by default in Leopard)
*
What does this mean?
By default, only clients on the same subnet can print to your system.
If you check this box, it allows print jobs from anywhere.
*4) “Use Kerberos Authentication” (Disabled by default in Leopard, & has
minor caveats if you want to enable it – see the CUPS documents for
specs, etc)
*
I assume this means if you want the Mac to be a print SERVER, right?
(i.e.; allow other Mac & PC clients in the same Kerberos realm as the
Mac print server to allow SSO. This requires the Mac to have a service
ticket for print services, etc) Right?
Yes, but this check box in particular just changes the default
authentication from HTTP Basic which maps to PAM and Authorization
Services on Mac OS X to HTTP Negotiate which only uses Kerberos.
You still have to configure Kerberos on your systems, and restricted
printing requires additional configuration - examples are included in
the on-line help.
--
______________________________________________________________________
Michael R Sweet Senior Printing System Engineer
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