Ntpd

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The correct title of this article is ntpd. The initial letter is shown capitalized due to technical restrictions.

The ntpd (Network Time Protocol daemon) program is an operating system daemon which sets and maintains the system time of day in synchronism with time servers (Mills).

1 Debugging
2 Implementations
3 ntpd guides
4 References

[edit] Debugging

If ntpd does not work (but is correctly configured) assuming an RFC-compliant implementation, your clock may have drifted too far. If you view /var/log/ntp.log, you may see an entry similar to:

18 Aug 21:04:40 ntpd[7220]: time correction of 1738 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time.

This sanity check can be overridden by adding the command-line switch "-g" when starting ntpd.

ntpd -g

[edit] Implementations

ISC NTP.Dev Web – The Internet Systems Consortium ISC development site.
OpenNTP – A portable Simple NTPD implementation by the OpenBSD group. (This is a SNTPD not NTPD)
Windows Port of NTPD – Free Windows port of NTPD with an easy-to-use installer

[edit] ntpd guides

[edit] References

Mills, D. L. (2005) ntpd - Network Time Protocol (NTP) daemon, The University of Delaware, USA. 2005. Available from http://www.eecis.udel.edu/~mills/ntp/html/ntpd.html (Date Accessed: 19 August 2005)