Defines the IP address for the main NTP server used in your network. The default is the address for the CentOS NTP server. If you do not establish an internet connection for the NetMon appliance and want to use a local NTP server, enter the address for that local server here.
You do not need to define an NTP server, but the time values displayed will likely be out of sync with your web browser and it will be difficult to ascertain the exact time a network event occurred.