Novell LINUX ENTERPRISE SERVER 11 - ADMINISTRATION Administration Manual page 288

firewall-protected system, the advanced configuration can open the required ports in
SuSEfirewall2.
20.1.1 Advanced NTP Client Configuration
You can either configure the NTP client manually or automatically to get a list of the
NTP servers available in your network via DHCP. If you choose Configure NTP Daemon
via DHCP, the manual options explained below are not available.
The servers and other time sources for the client to query are listed in the lower part of
the General Settings tab. Modify this list as needed with Add, Edit, and Delete. Display
Log provides the possibility to view the log files of your client.
Click Add to add a new source of time information. In the following dialog, select the
type of source with which the time synchronization should be made. The following
options are available:
Server
Another dialog enables you to select an NTP server. Activate Use for Initial Syn-
chronization to trigger the synchronization of the time information between the
server and the client when the system is booted. Options allows you to specify ad-
ditional 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 field is enabled only
after checking Restrict NTP Service to Configured Servers Only on the Security
Settings tab. 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 recommended
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
274 Administration Guide