CUPS, Alpine, and printserving

Mikkel L. Ellertson mikkel at infinity-ltd.com
Sat Nov 1 15:48:19 UTC 2008


Timothy Murphy wrote:
> Mikkel L. Ellertson wrote:
> 
>> If you are using the CUPS web administration, look at the "Device
>> URI:" line. One should be a USB device, and one an
>> ippd://<address>:631/<something> - the ipp:// one should be the
>> default on all but the machine with the printer attached.
> 
> Dear Mikkel,
> 
> Are you suggesting one should use the ipp:// URI rather than http:// ?
> I always use the http one, on the grounds that I've heard of http .
> Is there really any difference?
> I assume one is not really using http, just the protocol.
> 
Yes, I am for the printer URI. http: is HyperText Transfer Protocol
- ipp: is Internet Printing Protocol (If I have the acronyms
correct.) In any case, it is one of the printing protocols, and it
is designed for network printers. On the other hand, http: is not
designed to be a printer protocol. To a large extent, it is
replacing the older lpr protocol.

When you are accessing the CUPS web interface, you would still use
http:// to get the human-readable interface. But your printer should
not be doing this.

> It's a pity CUPS gives an inordinately long URI for USB printers.
> 
Well, part of the reason for this is to make sure you are printing
to the correct printer, even if it is plugged into a different port,
or in a different order. It also makes sure you are talking to the
correct function on multi-function devices.

I don't know it there are USB printers that support different print
queues, but I imagine that would also affect the URI. I know it does
on ipp printers and print servers. (The last <something> in the URI
is normally the print queue.)

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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