mirror of https://github.com/NetBSD/src.git
137 lines
5.2 KiB
Plaintext
137 lines
5.2 KiB
Plaintext
# $NetBSD: ntp.conf,v 1.23 2021/10/28 07:24:40 kim Exp $
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#
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# NetBSD default Network Time Protocol (NTP) configuration file for ntpd
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# This file is intended to be both a usable default, and a Quick-Start
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# Guide. The directives and options listed here are not at all complete.
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# A great deal of additional documentation, including links to FAQS and
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# other guides, may be found on the official NTP web site, in particular
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#
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# http://www.ntp.org/documentation.html
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# Process ID file, so that the daemon can be signalled from scripts
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pidfile /var/run/ntpd.pid
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# Don't give up even if the reference time is hugely different. This can
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# happen if the system was suspended and resumed.
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#tinker panic 0
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# The correction calculated by ntpd(8) for the local system clock's
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# drift is stored here.
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driftfile /var/db/ntp.drift
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# Suppress the syslog(3) message for each peer synchronization change.
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logconfig -syncstatus
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# Refuse to set the local clock if there are too few good peers or servers.
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# This may help minimize disruptions due to network congestion. Don't
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# do this if you configure only one server!
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tos minsane 2
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# Set the target and limit for adding servers configured via pool statements
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# or discovered dynamically via mechanisms such as broadcast and manycast.
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# Ntpd automatically adds maxclock-1 servers from configured pools, and may
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# add as many as maxclock*2 if necessary to ensure that at least minclock
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# servers are providing good consistent time.
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tos minclock 3 maxclock 6
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# Set the number of tries to register with mdns. 0 means never
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mdnstries 0
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# New ntpd disables the ntpdc protocol by default, to re-enable uncomment
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# the following line
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#enable mode7
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# Allow hasty ntpdate clients to avoid rate limiting / kod responses.
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# The default is 2 seconds between packets from the client.
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#discard minimum 1
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# Access control restrictions.
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# See /usr/share/doc/html/ntp/accopt.html for syntax.
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# See <http://support.ntp.org/bin/view/Support/AccessRestrictions> for advice.
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# Last match wins.
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#
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# Some of the more common keywords are:
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# ignore Deny packets of all kinds.
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# limited Deny time service if the packet violates the rate limits
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# established by the discard command. Does not affect ntpq or
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# ntpdc queries.
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# kod Send "kiss-o'-death" packets if clients exceed rate limits.
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# No effect without the limited flag.
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# nomodify Deny attempts to modify the state of the server via ntpq or
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# ntpdc queries.
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# noquery Deny all ntpq and ntpdc queries. Does not affect time
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# synchronisation.
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# nopeer Prevent establishing new peer associations.
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# Does not affect peers configured using "peer" lines.
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# Does not affect client/server time synchronisation.
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# noserve Deny all time synchronisation. Does not affect ntpq or
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# ntpdc queries.
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# notrap Deny the trap subset of the ntpdc control message protocol.
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# notrust Deny packets that are not cryptographically authenticated.
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#
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# By default, allow client/server time exchange without prior
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# arrangement, but deny configuration changes, queries, and peer
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# associations that were not explicitly configured.
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restrict default limited kod nomodify notrap nopeer noquery
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# Restrictions used for associations (peer, server, pool).
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restrict source nomodify notrap noquery
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# Fewer restrictions for the local subnet.
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# (Uncomment and adjust as appropriate.)
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#restrict 192.0.2.0 mask 255.255.255.0 limited kod nomodify notrap nopeer
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#restrict 2001:db8:: mask ffff:ffff:: limited kod nomodify notrap nopeer
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# No restrictions for localhost.
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restrict 127.0.0.1
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restrict ::1
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# Hereafter should be "server", "peer", or "pool" statements to configure
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# other hosts to exchange NTP packets with.
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#
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# See <http://support.ntp.org/bin/view/Support/DesigningYourNTPNetwork>
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# and <http://support.ntp.org/bin/view/Support/SelectingOffsiteNTPServers>
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# for advice.
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#
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# Peers or servers should be selected in such a way that the network
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# path to them is short, uncongested, and symmetric (that is, the series
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# of links and routers used to get to the peer is the same one that
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# the peer uses to get back). The best place to start looking for NTP
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# peers for your system is within your own network, or at your Internet
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# Service Provider (ISP).
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#
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# Ideally, you should select at least three other systems to talk NTP
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# with, for an "what I tell you three times is true" effect.
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#peer an.ntp.peer.goes.here iburst
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#server an.ntp.server.goes.here iburst
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# The pool.ntp.org project coordinates public time servers provided by
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# volunteers. See <http://www.pool.ntp.org>. The *.netbsd.pool.ntp.org
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# servers are intended to be used by default on NetBSD hosts.
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#
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# The following pool statement will give you a random set of NTP servers
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# geographically close to you. A single pool statement adds multiple
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# servers from the pool, according to the tos minclock/maxclock targets.
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# The "2" host is used to obtain both IPv4 and IPv6 addresses.
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#
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# The pool.ntp.org project needs more volunteers! The only criteria to
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# join are a nailed-up connection and a static IP address. For details,
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# see the web page <http://www.pool.ntp.org/join.html>
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pool 2.netbsd.pool.ntp.org iburst
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