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Annotation of src/etc/ntp.conf, Revision 1.13

1.13    ! christos    1: # $NetBSD: ntp.conf,v 1.12 2011/07/28 22:28:07 simonb Exp $
1.1       fair        2: #
1.7       fredb       3: # NetBSD default Network Time Protocol (NTP) configuration file for ntpd
1.8       fredb       4:
                      5: # This file is intended to be both a usable default, and a Quick-Start
                      6: # Guide. The directives and options listed here are not at all complete.
1.9       reed        7: # A great deal of additional documentation, including links to FAQS and
1.8       fredb       8: # other guides, may be found on the official NTP web site, in particular
                      9: #
                     10: #      http://www.ntp.org/documentation.html
                     11: #
1.1       fair       12:
                     13: # Process ID file, so that the daemon can be signalled from scripts
                     14:
1.3       lukem      15: pidfile                /var/run/ntpd.pid
1.1       fair       16:
1.2       simonb     17: # The correction calculated by ntpd(8) for the local system clock's
1.7       fredb      18: # drift is stored here.
1.1       fair       19:
1.3       lukem      20: driftfile      /var/db/ntp.drift
1.1       fair       21:
1.7       fredb      22: # Suppress the syslog(3) message for each peer synchronization change.
1.1       fair       23:
1.3       lukem      24: logconfig      -syncstatus
1.5       fredb      25:
                     26: # This will help minimize disruptions due to network congestion. Don't
                     27: # do this if you configure only one server!
                     28:
                     29: tos            minsane 2
1.1       fair       30:
1.10      christos   31: # Set the number of tries to register with mdns. 0 means never
                     32: #
                     33: mdnstries      0
                     34:
1.7       fredb      35: # Hereafter should be "server" or "peer" statements to configure other
                     36: # hosts to exchange NTP packets with. Peers should be selected in such
                     37: # a way that the network path to them is symmetric (that is, the series
                     38: # of links and routers used to get to the peer is the same one that the
                     39: # peer uses to get back. NTP assumes such symmetry in its network delay
                     40: # calculation. NTP will apply an incorrect adjustment to timestamps
                     41: # received from the peer if the path is not symmetric. This can result
                     42: # in clock skew (your system clock being maintained consistently wrong
                     43: # by a certain amount).
                     44: #
1.1       fair       45: # The best way to select symmetric peers is to make sure that the
1.7       fredb      46: # network path to them is as short as possible (this reduces the chance
                     47: # that there is more than one network path between you and your peer).
                     48: # You can measure these distances with the traceroute(8)  program. The
                     49: # best place to start looking for NTP peers for your system is within
                     50: # your own network, or at your Internet Service Provider (ISP).
1.1       fair       51: #
1.7       fredb      52: # Ideally, you should select at least three other systems to talk NTP
                     53: # with, for an "what I tell you three times is true" effect.
1.1       fair       54: #
                     55:
1.3       lukem      56: #peer          an.ntp.peer.goes.here
                     57: #server                an.ntp.server.goes.here
1.4       agc        58:
1.6       fredb      59: # Public servers from the pool.ntp.org project. Volunteer's servers
                     60: # are dynamically assigned to the CNAMES below via DNS round-robin.
                     61: # The pool.ntp.org project needs more volunteers! The only criteria to
                     62: # join are a nailed-up connection and a static IP address. For details,
                     63: # see the web page:
                     64: #
1.4       agc        65: #      http://www.pool.ntp.org/
1.6       fredb      66: #
                     67:
                     68: # Depending on the vagaries of DNS can occasionally pull in the same
                     69: # server twice. The following CNAMES are guaranteed to be disjoint, at
1.13    ! christos   70: # least over some short interval. The following servers are allocated
        !            71: # to the NetBSD project.
1.6       fredb      72:
1.13    ! christos   73: server         0.netbsd.pool.ntp.org
        !            74: server         1.netbsd.pool.ntp.org
        !            75: server         2.netbsd.pool.ntp.org
        !            76: server         3.netbsd.pool.ntp.org

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