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- From: Pekka Helenius <fincer89@hotmail.com>
- Date: Tue, 04 Aug 2020 01:52:17 +0300
- Subject: Update default configuration file
-
-
- --- a/ntpd.conf 2020-07-31 23:00:50.000000000 +0300
- +++ b/ntpd.conf 2020-08-03 23:19:18.951338773 +0300
- @@ -1,11 +1,321 @@
- -# $OpenBSD: ntpd.conf,v 1.16 2019/11/06 19:04:12 deraadt Exp $
- -#
- # See ntpd.conf(5) and /etc/examples/ntpd.conf
-
- +# BASIC KEYWORDS
- +
- +# listen on 127.0.0.1 port 123
- +
- servers pool.ntp.org
- -server time.cloudflare.com
- -sensor *
- +server time.cloudflare.com
- +sensor *
-
- -constraint from "9.9.9.9" # quad9 v4 without DNS
- -constraint from "2620:fe::fe" # quad9 v6 without DNS
- +constraint from "9.9.9.9" # quad9 v4 without DNS
- +constraint from "2620:fe::fe" # quad9 v6 without DNS
- constraints from "www.google.com" # intentionally not 8.8.8.8
- +
- +constraints from "https://www.duckduckgo.com" port 443
- +
- +# ADVANCED KEYWORDS
- +
- +# During OpenNTPD initialization, all NTP peers get
- +# automatic time offset value, if pre-conditions for
- +# automatic interval adjustment are being met.
- +# The conditions are as follows: OpenNTPD configuration
- +# has constraints, trusted NTP peers or trusted sensors
- +# and current internally defined process security level
- +# is 0. In this case, initial time offset value is set
- +# to 1 which, in return, triggers automatic offset calculation.
- +#
- +# In the automatic offset calculation, a trusted NTP
- +# peer offset values are being counted for each peer.
- +# For each peer an independent pool size is determined
- +# by auto_replies value, ignoring the last value.
- +# For instance, with auto_replies value 4, first
- +# 3 NTP peer offset values are considered for a single
- +# NTP peer, and a median offset value of these collected
- +# 3 offset values is calculated and used for time adjustment.
- +#
- +# auto_replies 4
- +
- +# In OpenNTPD initial automatic time offset calculation,
- +# three conditions are being considered for NTP peers:
- +# is a NTP peer trusted and current overall constraint-based
- +# median offset not 0, and whether an initial NTP peer
- +# time offset exceeds value of auto_threshold . If these
- +# conditions are met, then auto_threshold value may be
- +# considered. If NTP peer current time offset value is
- +# less than auto_threshold , then the system time offset
- +# value is considered to be already OK, and OpenNTPD stops
- +# calculating automatic offset value from further NTP peer
- +# queries. In this case, median offset value is not calculated.
- +#
- +# auto_threshold 60
- +
- +# In automatic NTP peer offset calculation mode (during OpenNTPD
- +# initialization), if NTP peer IP address is still unresolved
- +# (unknown), the next query is attempted in interval_auto_dnsfail
- +# seconds. Applies to unresolved constraint IP addresses, as well.
- +#
- +# interval_auto_dnsfail 1
- +
- +# Maximum number of attempts to resolve a constraint IP address(es)
- +# with a DNS query before falling back from constraint_retry_interval
- +# to interval_auto_dnsfail in constraint initialization.
- +#
- +# tries_auto_dnsfail 4
- +
- +# PEM-formatted certificate bundle file
- +# for constraint HTTPS connections.
- +#
- +# constraint_ca /etc/ssl/cert.pem
- +
- +# Whether to validate constraint HTTPS
- +# server certificate.
- +#
- +# constraint_ca_validation true
- +
- +# Use either LibreSSL (libressl) or OpenSSL (openssl)
- +# for constraint HTTPS server connections. To
- +# support chosen TLS engine, ntpd(8) must be
- +# compiled and run with proper libraries installed
- +# on the system. Only LibreSSL and OpenSSL are
- +# supported.
- +#
- +# constraint_engine libressl
- +
- +# Accepted number of errors during constraint
- +# process. If error count exceeds this value
- +# multiplied by calculated peer count,
- +# constraint connection will be reseted and
- +# a new constraint is retrieved.
- +#
- +# constraint_error_margin 4
- +
- +# Acceptable time difference between retrieved
- +# HTTP header time value and calculated time
- +# value in seconds. HTTP header time values
- +# exceeding this margin value will be ignored.
- +#
- +# constraint_margin 120
- +
- +# Maximum allowed HTTP header length of constraint
- +# HTTPS server reply to be fetched in bytes. If
- +# the value is exceeded during processing, nothing
- +# is returned and constraint check fails.
- +#
- +# constraint_max_headerlength 8192
- +
- +# Constraint HTTPS servers scan interval in seconds.
- +#
- +# constraint_scan_interval 900
- +
- +# Maximum connection establishment time to a
- +# constraint HTTPS server in seconds.
- +#
- +# constraint_scan_timeout 10
- +
- +# ntpd(8) socket file path.
- +#
- +# ctlsocket /var/run/ntpd.sock
- +
- +# ntpd(8) drift file path.
- +#
- +# driftfile /var/db/ntpd.drift
- +
- +# Whether to reset frequency filters after
- +# frequency adjustment.
- +#
- +# filter_adjfreq true
- +
- +# Number of frequency samples for estimating
- +# permanent drift value.
- +#
- +# frequency_samples 8
- +
- +# Initial trust level for a new, timed out or
- +# erroneous remote NTP server. Every received
- +# and non-discarded reply increases trust for
- +# the server. The trust level is used for
- +# setting used interval_query_* value for the
- +# server and keeping track of valid remote NTP
- +# servers.
- +#
- +# A server having this trust level uses remote
- +# NTP query interval value interval_query_aggressive .
- +#
- +# trustlevel_pathetic 2
- +
- +# If a replying remote NTP server has trust level
- +# one number less than this value, the server gets
- +# trusted. In this case, the server can achieve
- +# maximum trust level trustlevel_max . This trust
- +# level is preceded by trust level trustlevel_pathetic
- +# and followed by trust level trustlevel_aggressive .
- +#
- +# A NTP server having trust level value trustlevel_badpeer ,
- +# or value greater than trustlevel_pathetic but less than
- +# trustlevel_aggressive uses remote NTP query interval
- +# value interval_query_aggressive .
- +#
- +# In a case of NTP server reply time out, if the server
- +# has at least trust level value trustlevel_badpeer
- +# and the trust level value divided by 2 is less than
- +# the trustlevel_badpeer value, the server will be
- +# invalidated and falls back to initial trust level
- +# trustlevel_pathetic .
- +#
- +# trustlevel_badpeer 6
- +
- +# Aggressive trust level is preceded by trust level
- +# trustlevel_badpeer and followed by trust level
- +# trustlevel_max . If a remote NTP server current trust
- +# level is at least value of trustlevel_pathetic but
- +# less than this value, used remote NTP query interval
- +# is determined by value interval_query_aggressive .
- +# A server with exact trust level trustlevel_aggressive
- +# uses query interval interval_query_normal
- +# (see trustlevel_max below).
- +#
- +# trustlevel_aggressive 8
- +
- +# Maximum trust level follows trust level trustlevel_aggressive .
- +# This is the maximum trust level which a remote NTP
- +# server can achieve. A server having at least trust
- +# level trustlevel_aggressive uses remote NTP query
- +# interval value interval_query_normal .
- +#
- +# trustlevel_max 10
- +
- +# Remote NTP server query interval in seconds for servers with
- +# a trust level value greater than trustlevel_pathetic but less
- +# than trustlevel_aggressive in a case where a NTP peer does not
- +# still have large enough pool of already queried offset time values
- +# for its offset time median calculation (checked against value
- +# auto replies ) or is not trusted , interval value
- +# interval_query_ultra_violence may be triggered.
- +# Applies only to NTP offset calculation automatic mode.
- +#
- +# In most cases, interval_query_aggressive is used instead.
- +# Dynamic offset scale value factors qscale_off_min and qscale_off_max
- +# are ignored.
- +#
- +# interval_query_ultra_violence 1
- +
- +# Remote NTP server query interval in seconds for
- +# servers with a trust level value less than trustlevel_pathetic .
- +# Practically never used.
- +#
- +# This value is not the final query interval value but
- +# used in a combination with a dynamic offset scale value,
- +# determined by qscale_off_min and qscale_off_max .
- +#
- +# trustlevel_query_pathetic 60
- +
- +# Remote NTP server query interval in seconds for servers
- +# with a trust level value greater than trustlevel_pathetic
- +# but less than trustlevel_aggressive . Since all servers
- +# start with a value trustlevel_pathetic , it means that
- +# this is the initial value used for all new, timed out
- +# or erroneous NTP servers.
- +#
- +# This value is not the final query interval value but
- +# used in a combination with a dynamic offset scale value,
- +# determined by qscale_off_min and qscale_off_max .
- +#
- +# trustlevel_query_aggressive 5
- +
- +# Remote NTP server query interval in seconds for servers
- +# with a trust level value between trustlevel_aggressive
- +# and trustlevel_max .
- +#
- +# This value is not the final query interval value but
- +# used in a combination with a dynamic offset scale value,
- +# determined by qscale_off_min and qscale_off_max .
- +#
- +# trustlevel_query_normal 30
- +
- +# Retry time in seconds after failed connection attempt
- +# to a remote NTP server.
- +#
- +# interval_query_timeout 300
- +
- +# Negligible frequency rate to not log in PPM.
- +#
- +# log_negligible_adjfreq 0.05
- +
- +# Negligible drift time to not log in milliseconds.
- +#
- +# log_negligible_adjtime 32
- +
- +# Maximum allowed frequency correction per iteration.
- +#
- +# max_frequency_adjust 0.0128
- +
- +# Maximum number of errors tolerated before reconnecting
- +# to a remote NTP server.
- +#
- +# max_send_errors 3
- +
- +# Maximum number of remote NTP server IP addresses
- +# fetched per DNS query.
- +#
- +# max_servers_dns 8
- +
- +# ntpd(8) process user name. Group name and working
- +# directory are internally fetched by getpwnam(3) .
- +#
- +# ntpd_user ntp
- +
- +# Minimum scale value used for dynamically adjusting
- +# NTP server query interval time. If median NTP server
- +# & sensor offset value is lower than this value, then
- +# this value is used for scale calculation as minimum value.
- +# Otherwise, the offset value is used as minimum value.
- +# The offset value is a combined median value, based on
- +# all NTP server & sensor offset values.
- +#
- +# The determined frequency scale is
- +# qscale_off_max / { qscale_off_min OR median offset } .
- +#
- +# In the end, the calculated scale value is multiplied
- +# one of interval_query_* values (pathetic, aggressive, normal)
- +# on a client side, and ultimately used for dynamic
- +# adjustment of client-side NTP server query interval time
- +# for ntpd(8) process.
- +#
- +# qscale_off_min 0.001
- +
- +# Maximum scale value used for dynamically adjusting
- +# NTP server query interval time. This value is used
- +# either with a median NTP server & sensor offset value,
- +# described in qscale_off_min section, or directly with
- +# the value of qscale_off_min . The more detailed description
- +# about further use of this value is above and
- +# in interval_query_* sections.
- +#
- +# qscale_off_max 0.050
- +
- +# Maximum time reserved for a single NTP server query
- +# in seconds.
- +#
- +# querytime_max 15
- +
- +# Sensor data maximum valid age in seconds.
- +#
- +# sensor_data_maxage 900
- +
- +# Sensor default reference ID string.
- +#
- +# sensor_default_refid "HARD"
- +
- +# Sensor query interval in seconds.
- +#
- +# sensor_query_interval 15
- +
- +# Scan interval for new sensors in seconds.
- +#
- +# sensor_scan_interval 60
- +
- +# Maximum time to wait for a constraint to reply
- +# during OpenNTPD initial automatic mode.
- +#
- +# settime_timeout 100
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