Operation Manual
Server
In the pull-down Select list (see Figure 17.2, “YaST: NTP Server” (page 325), de-
termine whether to set up time synchronization using a time server from your local
network (Local NTP Server) or an Internet-based time server that takes care of
your time zone (Public NTP Server). For a local time server, click Lookup to start
an SLP query for available time servers in your network. Select the most suitable
time server from the list of search results and exit the dialog with OK. For a public
time server, select your country (time zone) and a suitable server from the list under
Public NTP Server then exit the dialog with OK. In the main dialog, test the avail-
ability of the selected server with Test. Options allows you to specify additional
options for ntpd.
Using Access Control Options, you can restrict the actions that the remote computer
can perform with the daemon running on your computer. This eld is enabled only
after checking Restrict NTP Service to Congured Servers Only on the Security
Settings tab (see Figure 17.3, “Advanced NTP Conguration: Security Set-
tings” (page 327)). The options correspond to the restrict clauses in /etc/
ntp.conf. For example, nomodify notrap noquery disallows the server
to modify NTP settings of your computer and to use the trap facility (a remote
event logging feature) of your NTP daemon. Using these restrictions is recommend-
ed for servers out of your control (for example, on the Internet).
Refer to /usr/share/doc/packages/ntp-doc (part of the ntp-doc
package) for detailed information.
Peer
A peer is a machine to which a symmetric relationship is established: it acts both
as a time server and as a client. To use a peer in the same network instead of a
server, enter the address of the system. The rest of the dialog is identical to the
Server dialog.
Radio Clock
To use a radio clock in your system for the time synchronization, enter the clock
type, unit number, device name, and other options in this dialog. Click Driver
Calibration to ne-tune the driver. Detailed information about the operation of a
local radio clock is available in /usr/share/doc/packages/ntp-doc/
refclock.html.
326 Reference