Technical data

Configuring and Managing NTP
12.3 Configuring Your NTP Host
this mode, both the local and remote servers should use authentication and
the same trusted key and key identifier.
• multicastclient address
This statement directs the local server to listen for multicast messages at
the group address of the global network. This command operates like the
broadcastclient command but uses IP multicasting.
•
driftfile file-specification
This statement specifies the name of the file used to record the frequency
offset of the local clock oscillator. If the file exists, it is read at startup to
set the initial frequency offset, and then is updated hourly with the current
frequency computed by the NTP server.
If the file does not exist or if the driftfile command is not specified in the
configuration file, the initial frequency offset is assumed to be zero. If the file
does not exist but the
driftfile keyword is specified without a parameter,
the default, SYS$SPECIFIC:[TCPIP$NTP]TCPIP$NTP.DRIFT, is used.
In these cases, it may take some hours for the frequency to stabilize and the
residual timing errors to subside.
The drift file TCPIP$NTP.DRIFT consists of a single floating-point number,
which records the frequency of the offset measured in parts per million (ppm).
• enable auth | bclient | monitor | pll | stats
disable auth | bclient | monitor | pll | stats
These statements enable and disable the following server options:
auth Controls synchronization with unconfigured peers only if the peer
has been correctly authenticated using a trusted key and key
identifier. By default,
auth is enabled.
bclient Controls the server to listen for messages from broadcast or
multicast servers. By default,
bclient is disabled.
monitor Controls the monitoring facility. By default, monitor is enabled.
pll Controls whether the server adjusts its local clock by means of
NTP. If disabled, the local clock free-runs at its intrinsic time and
frequency offset. This flag is useful if the local clock is controlled
by some other device or protocol and NTP is used only to provide
synchronization to other clients. In this case, the local clock driver
is used. By default,
pll is enabled.
stats Enables the statistics facility. By default, stats is enabled.
12.3.2.1 NTP Monitoring Options
TCP/IP Services NTP includes a comprehensive monitoring facility suitable for
continuous, long term recording of server and client timekeeping performance.
See the
statistics command below for a listing and example of each type of
statistics currently supported. Statistic files are managed using file generation
sets and scripts.
You can specify the following monitoring commands in your configuration file:
• statistics name [ ... ]
Enables writing of statistics records. The following is a list of the supported
name statistics:
loopstats
12–6 Configuring and Managing NTP