Ntpd

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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).

Contents 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. 

The sanity check can be overridden by issuing the following command and should take approximately a minute to complete.

ntpd -g -q

[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

• Official NTP Documentation
• ISC NTP Documentation Index
• OpenNTP manual pages
• Gentoo Wiki
• Generic Linux notes

[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)