To begin NTP configuration, navigate to Services | NTP, as shown in the following screenshot. The NTP page has three tabs and the first (and default) tab is Settings. The first option on this page is the Interfaces list box, in which you can select the interfaces on which the NTP service will listen. The default setting is to listen on all interfaces, but since the NTP server is probably upstream, you can select WAN as the only interface on which to listen (or multiple WAN interfaces, if you have them).
The next option is Time Servers. The time server you specified when you initially configured the system will be listed here, but you can also specify additional servers by clicking on the Add button. You need to specify the ...
