Chapter Summary | HP Certified: HP-UX System Administration

Network Time Protocol (NTP) is used to synchronize system time with a reference time source. Reference time sources are radio broadcasts, timeservers on the Internet, or a system's internal clock. The broadcast is the most accurate time source while the system internal clock is the least accurate. NTP activities are controlled by the xntpd daemon on HP-UX, which is started at boot time. A host may be configured as an NTP client, server, or both. Stratum levels are used to grade the accuracy of a timeserver. The NTP daemon xntpd uses a configuration file /etc/ntp.conf , which contains a list of servers. A client may be a direct polling client or a broadcast client. A broadcast client depends on time information broadcasted by a timeserver on a network. The ntpdate command is used to manually synchronize a system clock. NTP can be configured using the command line or SAM.

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