NTP100 – Rev 2.2.0 Oct-12
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Provide Multicast
The NTP100 can be set up to provide NTP using multicast by selecting the “Provide NTP using multicast address below”
checkbox. When enabled, the multicast class D / group address may be specified as well as the frequency that multicast
broadcasts will be issued. This can be changed as desired. The NTP100 can provide NTP multicast broadcasts using the full
class D/ group address range. The NTP100 does not restrict the use of the multicast address assignment and supports the full
range of class D multicast addresses or groups from 224.0.0.0 to 239.255.255.255 . These groups or class D address ranges
for multicasting are defined and governed by RFC3171
, IANA IPv4 Multicast Guidelines.
Typically, the multicast address range 224.0.1.0 - 224.0.1.255 (224.0.1/24) [ Internetwork Control Block] is utilized for
NTP traffic, however, please refer to the RFC3171
for your specific application and implementation.
Note: While providing NTP broadcasts, the NTP100 device can also continue to be queried.
Note: Some NTP/SNTP clients will expect NTP servers to operate on port 123 and cannot be configured to utilize alternate
ports.
Provide Broadcast and Multicast
Broadcast and Multicast may be enabled at the same time to allow for a flexible network configuration. Unicast or
query mode will always be available.
Note: While providing NTP broadcasts, the NTP100 device can also continue to be queried.
Note: Some NTP/SNTP clients will expect NTP servers to operate on port 123 and cannot be configured to utilize alternate
ports.
Selecting NTP Multicast mode
Selectin
both NTP Broadcast and Multicast modes
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