Data
Name
Data Description Range Resolution Units
NSec NSec within the current second Unsigned 32 bit
integer
1 nsec
EOM End-of-message -1 1 n/a
2.15 Configure NTP
Network Time Protocol (NTP) and Simple Network Time Protocol (SNTP) are client-
server protocols that are used to synchronize time on IP networks. NTP provides greater
accuracy and better error checking capabilities than SNTP does, but requires more
resources.
For many applications, it is not necessary to modify the NTP factory default configuration
settings. It is possible, however, to change most of the settings in order to support specific
NTP applications which may require a non-standard configuration:
These features include MD5 authentication to block NTP access to parts of the network
and to broadcast NTP data to the network’s broadcast address. NTP and SNTP are used to
synchronize time on any computer equipment compatible with the Network Time Pro-
tocol. This includes Cisco routers and switches, UNIX machines, and Windows machines
with suitable clients. To synchronize a single workstation, several freeware or shareware
NTP clients are available on the Internet. The software running on the PC determines
whether NTP or SNTP is used.
When the NTP service is enabled, SecureSync will “listen” for NTP request messages from
NTP clients on the network. When an NTP request packet is received, SecureSync will
send an NTP response time packet to the requesting client. Under typical conditions,
SecureSync can service several thousand NTP requests per second without MD5 authen-
tication enabled, and at a somewhat lower rate with MD5 authentication enabled.
You can either enable or completely disable the NTP Service. When NTP is disabled, no
NTP time packets will be sent out to the network. When enabled, by default, the NTP Ser-
vice operates in Unicast mode, i.e. the NTP Service responds to NTP requests only.
Note: In order to configure NTP, you need to access the NTP Setup screen
which requires ADMINISTRATORrights.
2.15.1 Checklist NTP Configuration
The following is a list of configuration settings you may want to consider as you setup your
NTP Service. (Not all items may apply to your application, or there may be other con-
siderations not included in this list.)
96
CHAPTER 2 • SecureSync 2400 User Manual Rev. 2
2.15 Configure NTP
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