# $NetBSD: ntp.conf,v 1.9 2007/02/10 19:36:56 reed Exp $ # # NetBSD default Network Time Protocol (NTP) configuration file for ntpd # This file is intended to be both a usable default, and a Quick-Start # Guide. The directives and options listed here are not at all complete. # A great deal of additional documentation, including links to FAQS and # other guides, may be found on the official NTP web site, in particular # # http://www.ntp.org/documentation.html # # Process ID file, so that the daemon can be signalled from scripts pidfile /var/run/ntpd.pid # The correction calculated by ntpd(8) for the local system clock's # drift is stored here. driftfile /var/db/ntp.drift # Suppress the syslog(3) message for each peer synchronization change. logconfig -syncstatus # This will help minimize disruptions due to network congestion. Don't # do this if you configure only one server! tos minsane 2 # Hereafter should be "server" or "peer" statements to configure other # hosts to exchange NTP packets with. Peers should be selected in such # a way that the network path to them is symmetric (that is, the series # of links and routers used to get to the peer is the same one that the # peer uses to get back. NTP assumes such symmetry in its network delay # calculation. NTP will apply an incorrect adjustment to timestamps # received from the peer if the path is not symmetric. This can result # in clock skew (your system clock being maintained consistently wrong # by a certain amount). # # The best way to select symmetric peers is to make sure that the # network path to them is as short as possible (this reduces the chance # that there is more than one network path between you and your peer). # You can measure these distances with the traceroute(8) program. The # best place to start looking for NTP peers for your system is within # your own network, or at your Internet Service Provider (ISP). # # Ideally, you should select at least three other systems to talk NTP # with, for an "what I tell you three times is true" effect. # #peer an.ntp.peer.goes.here #server an.ntp.server.goes.here # Public servers from the pool.ntp.org project. Volunteer's servers # are dynamically assigned to the CNAMES below via DNS round-robin. # The pool.ntp.org project needs more volunteers! The only criteria to # join are a nailed-up connection and a static IP address. For details, # see the web page: # # http://www.pool.ntp.org/ # # The country codes can help you find servers that are net-wise close. # As explained above, closer is better... # Northern U.S.A #server ca.pool.ntp.org #server us.pool.ntp.org #server us.pool.ntp.org # Northern Europe #server de.pool.ntp.org #server de.pool.ntp.org #server dk.pool.ntp.org # Depending on the vagaries of DNS can occasionally pull in the same # server twice. The following CNAMES are guaranteed to be disjoint, at # least over some short interval. server 0.pool.ntp.org server 1.pool.ntp.org server 2.pool.ntp.org