The Network Time Service facility synchronizes your GTA Firewall and computers behind the firewall with an NTP server located on the Internet. Network Time Service uses the Network Time Protocol (NTP), an Internet protocol originally developed by David L. Mills.
The Network Time Service is highly accurate, with a resolution of under a nanosecond (one billionth of a second) and the ability to combine the output of the available time servers to reduce error. It also uses past measurements to estimate the current time when the network is down. The Network Time Service facility uses UTC (Universal Time Coordinated), which evolved from GMT (Greenwich Mean Time).
Enter up to six NTP servers, either by host name or IP address. These servers can be on your internal network or external to your system. You must have DNS server defined in the Basic Configuration section if you use host names.
See more about UTC in Set Date/Time.
The firewall can be configured to serve as an NTP server for other hosts on the network. To designate the firewall as an NTP server, enable the Network Time Service and then create a Remote Access Filter that accepts connections on UDP port 123. Configure your hosts to indicate the GTA Firewall as their NTP server.
The following are a sample of the NTP and time server resources available. Locate a site that serves your time zone and contact the administrator, as required.
NIST Network Time Servers. www.boulder.nist.gov/timefreq
Network Time Protocol organization. www.ntp.org
Network Time Protocol RFC 1305
NTP Zeit. www.ntp-zeit.de
¨ Note
Network Time Server sites require contacting the site administrator before using the time server.