On the left menu, click on “Your System / Time server” Under status button, you can define several options:
Restrict to local Networks : Allow the NTP service to only provide time information for computers inside RFC 1918 private addresses ( 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 )
Default NTP Servers: Allow Artica to automatically set the Internet NTP time server according your country ( if Use Specified Time Servers option is disabled)
Use Specified Time Servers: Allow you to add your own list of public/private NTP servers
Listen Interface: Which Network Interface card will bind to.