EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 20
C H A P T E R T H R E E
21 T e m p u s L X G P S U s e r M a n u a l
S E T T I N G U P N T P C L I E N T S O N U N I X - L I K E P L A T F O R M S
Basic NTP Client Setup
Basic setup is relatively simple, if:
• You have been able to successfully communicate with the Tempus LX on your network.
• You have installed NTP on your client computer.
Configure NTP
You must edit the ntp.conf file which
ntpd
, the NTP daemon, looks for by default in the the /etc
directory. Add this line to the ntp.conf file:
server 192.168.1.245
This line tells
ntpd
to use the NTP server at address 192.168.1.245 in addition to any other servers
which might also be configured in the client’s
ntp.conf
file.
Re-start
ntpd
to have it begin using the Tempus LX server. Use the NTP utility
ntpq
to check that
ntpd
is able to communicate with the Tempus LX. After issuing the command
ntpq
you will see the
ntpq
command prompt:
ntpq>
Use the command
peers
to display the NTP peers which your computer is using. One of them should be the Tempus LX
server which you have just configured. You should verify that it is being ‘reached’. (You may have
to continue issuing the peers command for a minute or two before you will see the ‘reach’ count
increment.) If you have other peers configured, verify that the offset information for the Tempus LX
server peer and your other peers is in agreement to within a few milliseconds, assuming that the other
peers are synchronized to that level of accuracy.
It may also be useful to start the NTP daemon in ‘debug’ mode (
ntpd -d
) to confirm successful
configuration. Refer to the NTP documentation for detailed usage of these debug utilities.
MD5 Authenticated NTP
Client Setup
MD5 authenticated setup is relatively simple, if:
• You have been able to successfully communicate with the Tempus LX on your network.
• Your Tempus LX has been configured to perform authentication either by factory default, or by
running the
ntpconfig
shell script. The example Tempus LX authentication configuration shown in
Chapter 2 - Configuring the Network Time Protocol will be assumed in the example configuration
commands shown here.
• You have installed NTP on your client computer.