[cups.general] How to avoid print tunneling?

[henri]

> The students discovered that they can use SSH print tunneling:
> ssh -L 9100:printerIP:9110 login
> so they can print without use the accounting system.

Pykota is good idea. It is an extremely flexible system.  
PrintingWorks <http://www.lucidsystems.org/printingworks/> uses  
Pykota as the accounting back-end.