T e m p u s L X G P S U s e r M a n u a l
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C H A P T E R F O U R
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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
S E T T I N G U P N T P C L I E N T S O N W I N D O W S N T 4 . 0 / 2 0 0 0 / X P
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.
• You have successfully performed the
Basic NTP Client Setup
on your client computer.
Create the ntp.keys File
You must create a file named
ntp.keys
in the
\winnt\system32\drivers\etc
directory or, for XP, the
\windows\system32\drivers\etc
directory. It must be a copy of the one residing in the
/etc
directory of
your Tempus LX. You can
telnet
into your Tempus LX and start an
ftp
session with your client
computer to send the Tempus LX
/etc/ntp.keys
file to your client computer, or use the secure copy
utility
scp
, or use a text editor to create the equivalent file. Although you should first test your setup
using the factory default
/etc/ntp.keys
file in your Tempus LX server, you should create your own
keys after you understand the process and have your clients operating correctly with the default file.
IMPORTANT
Handling of the
\windows\system32\drivers\etc\ntp.keys
file is the weak link in the MD5 authen-
tication scheme. It is very important that it is owned by “administrator” and not readable by anyone other
than “administrator”.
After transferring the file, make sure that its security properties are set such that it is readable only by the
“administrator”.
Configure NTP
You must edit the
ntp.conf
file which
ntpd.exe
, the NTP daemon, looks for by default in the the
\winnt\system32\drivers\etc
directory. If your NTP installation placed this file in a different place,
you must find it and edit it. For example, XP uses
\windows\system32\drivers\etc
. Add these lines to
the end of the
ntp.conf
file:
keys \winnt\system32\drivers\etc\ntp.keys
trustedkey 1 2
Modify the line added previously in
Basic NTP Client Setup
so that authentication will be used with
the Tempus LX server using one of the trusted keys, in this case key # 1:
server 192.168.1.245 key 1
Summary of Contents for Tempus LX GPS
Page 1: ...Smarter Timing Solutions Tempus LX GPS Network Time Server User Manual...
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Page 6: ...Te m p u s L X G P S U s e r M a n u a l...
Page 36: ...Te m p u s L X G P S U s e r M a n u a l 24 C H A P T E R T H R E E...
Page 84: ...Te m p u s L X G P S U s e r M a n u a l 72 A P P E N D I X C...
Page 90: ...Te m p u s L X G P S U s e r M a n u a l 78 A P P E N D I X E...
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Page 112: ...Te m p u s L X G P S U s e r M a n u a l 100 A P P E N D I X I...
Page 114: ...Te m p u s L X G P S U s e r M a n u a l 102 S P E C I A L M O D I F I C AT I O N S...
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