Digi LR54 User Manual page 683

Services
3. Click Services > NTP.
4. Enable the LR54 device's NTP service by clicking Enable.
5. (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:
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a. Click IPv4 Addresses.
b. For Add Address, click .
c. For Address, enter the IPv4 address or network that can access the device's NTP
d. Click  again to list additional IP addresses or networks.
To limit access to specified IPv6 addresses and networks:
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a. Click IPv6 Addresses.
b. For Add Address, click .
c. For Address, enter the IPv6 address or network that can access the device's NTP
d. Click  again to list additional IP addresses or networks.
To limit access to hosts connected through a specified interface on the LR54 device:
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a. Click Interfaces.
b. For Add Interface, click .
c. For Interface, select the appropriate interface from the dropdown.
d. Click  again to allow access through additional interfaces.
To limit access based on firewall zones:
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a. Click Zones.
b. For Add Zone, click .
LR54 User Guide
service. Allowed values are:
A single IP address or host name.
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A network designation in CIDR notation, for example, 192.168.1.0/24.
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any: No limit to IPv4 addresses that can access the NTP service.
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service. Allowed values are:
A single IP address or host name.
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A network designation in CIDR notation, for example, 2001:db8::/48.
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any: No limit to IPv6 addresses that can access the NTP service.
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Network Time Protocol
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