Novell LINUX ENTERPRISE DESKTOP 11 - ADMINISTRATION GUIDE 17-03-2009 Administration Manual page 302

work. For this purpose, they are assigned special IP addresses in the form
127.127.t.u. Here, t stands for the type of the clock and determines which driver
is used and u for the unit, which determines the interface used.
Normally, the individual drivers have special parameters that describe configuration
details. The file /usr/share/doc/packages/ntp-doc/drivers/driverNN
.html (where NN is the number of the driver) provides information about the particular
type of clock. For example, the "type 8" clock (radio clock over serial interface) requires
an additional mode that specifies the clock more precisely. The Conrad DCF77 receiver
module, for example, has mode 5. To use this clock as a preferred reference, specify
the keyword prefer. The complete server line for a Conrad DCF77 receiver
module would be:
server 127.127.8.0 mode 5 prefer
Other clocks follow the same pattern. Following the installation of the ntp-doc
package, the documentation for ntp is available in the directory /usr/share/doc/
packages/ntp-doc. The file /usr/share/doc/packages/ntp-doc/
refclock.html provides links to the driver pages describing the driver parameters.
290 Administration Guide