9.1.5.3 Broadcast Settings
If the NTP time should be distributed in Broadcast mode in a local network, you can enter a valid broad-
cast address into this menu. Please note: starting with NTP4 version, the broadcast mode must always be used
with authentication.
Broadcast Address:
A valid broadcast address of a local network, to which the LANTIME is connected must be entered here.
Broadcast Interval:
The interval at which the server sends the NTP packets to the configured broadcast address.
Symmetric Keys:
In this field you can enter the ID of a symmetric key, which is to be used for authentication with the NTP clients.
The following must be respected, to make the authentication work:
a)
The NTP key file of the server must contain the ID. You can edit the key file in the submenu
"NTP
→
NTP Symmetric Keys" on the NTP page.
b)
Additionally you must enter the ID into the field "Trustable Keys" under "NTP
→
General Settings".
c)
The same key with the same ID must be configured on the NTP client.
The following is an excerpt from the NTP configuration of a client, which is configured as a broadcast client
with authentication:
keys /etc/ntp.key # Path to the NTP Key File
trustedkey 1 # The Key ID, which is used for the authentication
broadcastclient # This client works as a broadcast client
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Date: 2nd July 2020
LANTIME CPU Expansion Shelf
