Module Name: src
Committed By: apb
Date: Mon Jan 6 11:25:03 UTC 2014
Modified Files:
src/etc: ntp.conf
Log Message:
Attempt to improve comments about how to choose servers,
and about what "tos minsane" does.
To generate a diff of this commit:
cvs rdiff -u -r1.16 -r1.17 src/etc/ntp.conf
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/etc/ntp.conf
diff -u src/etc/ntp.conf:1.16 src/etc/ntp.conf:1.17
--- src/etc/ntp.conf:1.16 Mon Jan 6 11:21:34 2014
+++ src/etc/ntp.conf Mon Jan 6 11:25:03 2014
@@ -1,4 +1,4 @@
-# $NetBSD: ntp.conf,v 1.16 2014/01/06 11:21:34 apb Exp $
+# $NetBSD: ntp.conf,v 1.17 2014/01/06 11:25:03 apb Exp $
#
# NetBSD default Network Time Protocol (NTP) configuration file for ntpd
@@ -23,7 +23,8 @@ driftfile /var/db/ntp.drift
logconfig -syncstatus
-# This will help minimize disruptions due to network congestion. Don't
+# 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
@@ -77,21 +78,18 @@ restrict 127.0.0.1
restrict ::1
# 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).
+# 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 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.
@@ -104,8 +102,13 @@ restrict ::1
#server an.ntp.server.goes.here
#restrict an.ntp.server.goes.here nomodify notrap
-# 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 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, but
+# servers that are closer to you are likely to be better. Consider
+# using servers specific to your country, a nearby country, or your
+# continent.
+#
# 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:
