EndRun Tempus LX GPS, User Manual, Page: 28 / 116

T e m p u s L X G P S U s e r M a n u a l 16
C H A P T E R T W O
17 T e m p u s L X G P S U s e r M a n u a l
B A S I C I N S T A L L A T I O N
which is the Linux standard, full-featured shell. After configuring the unit, you should change the
passwords using the
gntppasswd
command issued from the shell prompt.
Issuing
exit
will close the
ssh
session.
Configuring the
Network Time Protocol
Now that the network has been configured and tested, you may configure the operation of the NTP
server. By default, the Tempus LX is configured to respond to NTP requests from clients that may or
may not be using MD5 authentication. If the clients are using MD5 authentication, they must be con-
figured properly with the same MD5 authentication keys as the Tempus LX. If you need to modify
the factory default Tempus LX MD5 keys (recommended) or set up broadcast/multicast operation,
then you will need to re-configure the NTP subsystem. You may perform the configuration from
either a
telnet
or
ssh
session, the front-panel keypad, or the local RS-232 console.
NOTE
If you would like to configure your server for multicast operation, configure it as you would for broadcast
operation, with the exception that you must enter this specific NTP multicast address: 224.0.1.1, when you
are prompted to enter the broadcast address.
Configuring NTP Using the Front-Panel Keypad
To configure NTP using the front-panel keypad go to the Main Menu display. Press the RIGHT ar-
row key until the “NTP” selection is highlighted. Press ENTER again. Press the RIGHT arrow key
to highlight “Setup” and press ENTER. From this display you can configure broadcast/multicast
mode. You can also select previously configured MD5 authentication keys from this display. How-
ever, to configure new keys you will need to run
ntpconfig
.
Configuring NTP Using the Network Interface or Serial Port
The following is a transcript of the question and answer configuration utility provided by
ntpcon-
fig
. The user entered parameters are underlined:
Tempus LX GPS(root@gntp:~)-> ntpconfig
*******************************************************************************
**********************Network Time Protocol Configuration**********************
*******************************************************************************
* *
* This script will allow you to configure the ntp.conf and ntp.keys files *
* that control Tempus LX NTP daemon operation. *
* *
* You will be able to create new MD5 authentication keys which are stored *
* in the ntp.keys file. *
* *
* You will be able to update the authentication related commands in the *
* ntp.conf file. *
* *
* You will be able to configure the “broadcast” mode of operation, with *
* or without authentication. If you supply the multicast address instead *
* of your network broadcast address, then you will be able to configure *
* the time-to-live of the multicast packets. *
* *