Digi LR54 User Manual page 685

Services
4. (Optional) Add an upstream NTP server that the device will use to synchronize its time to the
appropriate location in the list of NTP servers. The default setting is time.devicecloud.com.
To delete the default NTP server, time.devicecloud.com:
n
(config)> del service ntp server 0
(config)>
To add the NTP server to the beginning of the list, use the index value of 0 to indicate
n
that it should be added as the first server:
(config)> add service ntp server 0 time.server.com
(config)>
To add the NTP server to the end of the list, use the index keyword end:
n
(config)> add service ntp server end time.server.com
(config)>
To add the NTP server in another location in the list, use an index value to indicate the
n
appropriate position. For example:
(config)> add service ntp server 1 time.server.com
(config)>
Note This list is synchronized with the list of servers included with NTP client configuration,
and changes made to one will be reflected in the other. See
more information about NTP client configuration.
5. Allow the device's local system clock to be used as backup time source:
(config)> service ntp local true
(config)>
6. (Optional) Configure the access control list to limit downstream access to the LR54 device's
NTP service.
To limit access to specified IPv4 addresses and networks:
n
(config)> add service ntp acl address end value
(config)>
Where value can be:
l
l
l
Repeat this step to list additional IP addresses or networks.
To limit access to specified IPv6 addresses and networks:
n
(config)> add service ntp acl address6 end value
(config)>
Where value can be:
LR54 User Guide
A single IP address or host name.
A network designation in CIDR notation, for example, 192.168.1.0/24.
any: No limit to IPv4 addresses that can access the NTP server agent.
Network Time Protocol
Configure the system time for
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