/etc/cups/cupsd.conf

Por defecto viene comentado y apto sólo para uso local. Una configuraci´on mínima es:

 ServerName mi.dominio
 DefaultCharset notused
 DefaultLanguage es
 LogLevel info
 Printcap /var/run/cups/printcap
 Port 631 # o Listen 127.0.0.1
 Browsing On
 BrowseProtocols cups
 BrowseAddress @LOCAL

<Location />
  Order Deny,Allow
  Deny From All
  Allow From 127.0.0.1
  Allow From 192.168.1.10
  Allow From 192.168.1.20
</Location>

<Location /printers/name>
  AuthType None
  Deny From All
  Allow From 192.168.1.10
  Allow From 192.168.1.20
</Location>

 <Location /admin>
  AuthType Basic
  AuthClass System
  Order Deny,Allow
  Deny From All
  Allow From 127.0.0.1
  Allow From 192.168.1.10
  Allow From 192.168.1.20
</Location>