From the Address Manager user interface you can enable NTP service and add IPv4 addresses for a hierarchy of NTP servers.
Network time protocol (NTP) service is essential to some of the more complex DNS/DHCP Server and Address Manager functions, such as xHA and DHCP failover, and differential deployment. A specific external time reference is also essential to some organizations for reports and compliance tracking. The NTP services on DNS/DHCP Server act as both a source of NTP synchronization for clients and as clients themselves to another NTP service that synchronizes the clock reference they provide.
To configure NTP on a DNS/DHCP Server appliance:
- From the configuration drop-down menu, select a configuration.
- Select the Servers tab. Tabs remember the page you last worked on, so select the tab again to ensure you're on the Configuration information page.
- Under Servers, click the name of a DNS/DHCP Server. The Details tab for the server opens.
- Click the server name menu and select Service Configuration. The Configure Remote Services page opens.
- Click the server name menu and select Service Configuration. The Service Configuration page opens.
From the Service Type drop-down menu, select Network
Time Protocol (NTP). Address Manager queries the server and returns the
current values for the service settings.
Attention: If you have upgraded from Address Manager v3.7.x, you will receive the following warning message:
- This service has been set to Override. Any update to the service will overwrite the existing service configuration with the settings added in the user interface.
Modifying the current service configuration will disable the Service Configuration Override and overwrite the existing configuration file with the new values and settings.
Click Cancel to preserve the service configuration files maintained during the upgrade from Address Manager v3.7.x.
Under General Settings, set the following
Note: Stratum values indicate the hierarchy level for the NTP server, which is the number of servers to a reference clock. This is used by the NTP client to avoid synchronization loops by preferring servers with a lower stratum.
- Enable NTP Service—select this check box to enable the NTP service; deselect this check box to disable the NTP service.
- NTP Server—enter the fully-qualified domain name or IP address for a remote NTP server from which Address Manager or DNS/DHCP Server will reference the time.
- Stratum—select a stratum value for the NTP server being added. This value will be associated to an individual NTP server specified in the NTP Server field. Select Default to use the stratum value set on the remote NTP server.
Click Add to associate a stratum value to a server and
add them to the list. To remove a server, select it from the list and click
Remove. The top-most NTP server will be queried
first, then the second, and so on down the list. To change the order of servers
in the list, select a server in the list and click Move
up or Move down.
By default, the NTP Server list contains at least the following IP addresses:
- DNS/DHCP Server NTP list:
- the IP address for the Address Manager appliance managing the DNS/DHCP Server
- Address Manager NTP list:
- the Local Reference Clock (127.127.1.0) on the connected server.
- DNS/DHCP Server NTP list:
- Click Update.