The easiest way to use a time server in the network is to set
server parameters. For example, if a time server
ntp.example.com is reachable from the
network, add its name to the file
/etc/ntp.conf by adding the line
To add more time servers, insert additional lines with the keyword server.
After initializing xntpd with the command
it takes about one hour until the time is stabilized
and the drift file for correcting the local computer clock is created.
With the drift file, the systematic error of the hardware clock
can be computed as soon as the computer is powered on.
The correction is used immediately, resulting in a
higher stability of the system time.
There are two possible ways to use the NTP mechanism as a client: First, the client can query the time from a known server in regular intervals. With many clients, this approach can cause a high load on the server. Second, the client can wait for NTP broadcasts sent out by broadcast time servers in the network. This approach has the disadvantage that the quality of the server is unknown and a server sending out wrong information can cause severe problems.
If the time is obtained via broadcast, you do not need the server name.
In this case, enter the line
in the configuration file
To use one or more known time servers exclusively,
enter their names in the line starting with