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12 The WEB Interface
statsdir /var/log/
statistics loopstats
driftle /etc/ntp.drift
# Edit /mnt/ash/ntpconf.add to add additional NTP parameters
By using the NTP conguration page, a number of additional parameters can be added to this default ntp.conf.
In the upper section up to ve external NTP servers can be set up to provide a high grade of redundancy for
the internal reference clock. For each of these external NTP servers the AUTOKEY or symmetric key feature of
NTP can be used to ensure the authentic of these time sources. The Prefer ag can be set for each external
server. The internal refclock has set this ag by default. The Prefer ag is usefull if one of the refclocks are
not available or out of sync.
The eld Stratum of local clock is used to change the stratum level of the local clock (see above), default
is 12.
The Local trusted key eld holds a list of all trusted symmetric keys (comma or space separated), which
have to be accepted by the NTPD of your LANTIME.
If you want to use your LANTIME timeserver to send NTP broadcast packets to your network, you have to
enter a valid broadcast address in NTP broadcast address. If you want to use IPv6 multicast mode, you have to
enter a valid IPv6 multicast address in this eld. Please note that NTP Version 4, which is used by the LANTIME
timeserver, only permits authenticated broadcast mode. Therefore you have to set up the AUTOKEY feature or
a symmetric key if you use a NTPv4 client and want to broadcast / multicast your time. A sample conguration
of the NTP client for broadcast with symmetric keys looks like:
broadcastclient yes
broadcastdelay 0.05
# depends on your network
keys /etc/ntp/keys
trustedkey 6 15
requestkey 15
controlkey 15
In the next section you can enable the AUTOKEY feature for your LANTIME timeserver and the PPS mode
(which is enabled in default settings), see above for a description.
The NTP Trusttime will specify the time how long the NTP will trust the reference time if this is not syn-
chronized (free running). This time will be set in seconds or minutes or hours. The value 0 will be select the
default value for the specic reference clock. The default values are:
LANTIME/GPS:
96 h
LANTIME/PZF:
0,5 h
LANTIME/RDT:
0,5 h
LANTIME/NDT:
96 h
After each restart and after any change of conguration a new /etc/ntp.conf le is generated by the LANTIME
software. Any changes you made to this le are lost. In order to use your custom ntp.conf (your LANTIME is
using a standard version of the NTP software suite, therefore all conguration parameters of the NTP software
are fully supported), you have to edit the le /mnt/ash/ntpconf.add, which is automatically appended to the
/etc/ntp.conf le generated at boot time or when reloading conguration after a change. You can edit this le
by using the button Edit additional NTP parameter.
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Date: 31st July 2014
LANTIME M600 MRS
