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 25
"Smarter Timing Solutions"
Chapter
Four
Setting Up NTP Clients on Windows NT 4.0/2000/XP
To configure your Windows NT 4.0/2000/XP computer to use your Tempus LX, you must have suc-
cessfully completed the Basic Installation procedures in Chapter 2. This manual is not a ‘How-To’ on
installing and using NTP; basic approaches to NTP configuration for operation with the Tempus LX
will be described here. Installation must be performed by a user with administrative priviledges on
the system. If you have never used NTP, then you should spend some time reading the on-line docu-
ments at: http://www.ntp.org .
Although all the information is available at the above site, the following are excellent tutorials on set-
ting up NTP and are easier to understand:
http://www.sun.com/solutions/blueprints/0701/NTP.pdf
http://www.sun.com/solutions/blueprints/0801/NTPpt2.pdf
http://www.sun.com/solutions/blueprints/0901/NTPpt3.pdf
If you have a news service, many problems may be solved by the helpful people who participate in
the Internet news group devoted to NTP at comp.protocols.time.ntp.
Three methods of using the Tempus LX with NTP clients on Window NT 4.0 platforms will be de-
scribed:
Basic: This is the simplest, and will operate without MD5 authentication. NTP beginners
should always perform this setup firs
t.
MD5: This method is trickier only because MD5 keys must be set up and distributed accurately to
the NTP clients in a secure way. The Tempus LX is factory configured to authenticate its replies to
NTP MD5 clients using its default set of keys.
Broadcast/Multicast:
This method simplifies configuration of the clients on large networks since
specific server addresses need not be configured in each client’s \winnt\system32\drivers\etc\ntp.conf
file. It can be configured either with or without MD5 authentication. However, it is highly recom-
mended that authentication be configured when using broadcast /multicast mode due to the relative
ease with which a fake NTP server can take over the clock setting of the broadcast/multicast clients
on the network.