Added ntp.conf

my_etc/ntp.conf

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+# $NetBSD: ntp.conf,v 1.23 2021/10/28 07:24:40 kim 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
+
+# Don't give up even if the reference time is hugely different. This can
+# happen if the system was suspended and resumed.
+
+#tinker panic 0
+
+# 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
+
+# Refuse to set the local clock if there are too few good peers or servers.
+# This may help minimize disruptions due to network congestion. Don't
+# do this if you configure only one server!
+
+tos minsane 2
+
+# Set the target and limit for adding servers configured via pool statements
+# or discovered dynamically via mechanisms such as broadcast and manycast.
+# Ntpd automatically adds maxclock-1 servers from configured pools, and may
+# add as many as maxclock*2 if necessary to ensure that at least minclock
+# servers are providing good consistent time.
+
+tos minclock 3 maxclock 6
+
+# Set the number of tries to register with mdns. 0 means never
+
+mdnstries 0
+
+# New ntpd disables the ntpdc protocol by default, to re-enable uncomment
+# the following line
+
+#enable mode7
+
+# Allow hasty ntpdate clients to avoid rate limiting / kod responses.
+# The default is 2 seconds between packets from the client.
+
+#discard minimum 1
+
+# Access control restrictions.
+# See /usr/share/doc/html/ntp/accopt.html for syntax.
+# See <http://support.ntp.org/bin/view/Support/AccessRestrictions> for advice.
+# Last match wins.
+#
+# Some of the more common keywords are:
+#   ignore      Deny packets of all kinds.
+#   limited     Deny time service if the packet violates the rate limits
+#               established by the discard command. Does not affect ntpq or
+#               ntpdc queries.
+#   kod         Send "kiss-o'-death" packets if clients exceed rate limits.
+#               No effect without the limited flag.
+#   nomodify    Deny attempts to modify the state of the server via ntpq or
+#               ntpdc queries.
+#   noquery     Deny all ntpq and ntpdc queries.  Does not affect time
+#               synchronisation.
+#   nopeer      Prevent establishing new peer associations.
+#               Does not affect peers configured using "peer" lines.
+#               Does not affect client/server time synchronisation.
+#   noserve     Deny all time synchronisation.  Does not affect ntpq or
+#               ntpdc queries.
+#   notrap      Deny the trap subset of the ntpdc control message protocol.
+#   notrust     Deny packets that are not cryptographically authenticated.
+#
+# By default, allow client/server time exchange without prior
+# arrangement, but deny configuration changes, queries, and peer
+# associations that were not explicitly configured.
+
+restrict default limited kod nomodify notrap nopeer noquery
+
+# Restrictions used for associations (peer, server, pool).
+
+restrict source nomodify notrap noquery
+
+# Fewer restrictions for the local subnet.
+# (Uncomment and adjust as appropriate.)
+
+#restrict 192.0.2.0 mask 255.255.255.0 limited kod nomodify notrap nopeer
+#restrict 2001:db8:: mask ffff:ffff::  limited kod nomodify notrap nopeer
+
+# No restrictions for localhost.
+
+restrict 127.0.0.1
+restrict ::1
+
+# Hereafter should be "server", "peer", or "pool" statements to configure
+# other hosts to exchange NTP packets with.
+#
+# See <http://support.ntp.org/bin/view/Support/DesigningYourNTPNetwork>
+# and <http://support.ntp.org/bin/view/Support/SelectingOffsiteNTPServers>
+# for advice.
+#
+# Peers or servers should be selected in such a way that the network
+# path to them is short, uncongested, and 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).  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 iburst
+#server an.ntp.server.goes.here iburst
+
+# The pool.ntp.org project coordinates public time servers provided by
+# volunteers.  See <http://www.pool.ntp.org>.  The *.netbsd.pool.ntp.org
+# servers are intended to be used by default on NetBSD hosts.
+#
+# The following pool statement will give you a random set of NTP servers
+# geographically close to you.  A single pool statement adds multiple
+# servers from the pool, according to the tos minclock/maxclock targets.
+# The "2" host is used to obtain both IPv4 and IPv6 addresses.
+#
+# 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/join.html>
+
+#pool 2.netbsd.pool.ntp.org iburst
+
+# Begin my custom config
+
+server pfswagg.swaggnet.real iburst prefer
+server swaggcore0.swaggnet.real iburst prefer
+server time-a-g.nist.gov iburst
+server time-b-g.nist.gov iburst
+server time-c-g.nist.gov iburst
+server time-d-g.nist.gov iburst
+server time-e-g.nist.gov iburst