IABSD.fr/src /etc/ntpd.conf

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Author : deraadt
Date : 2019-11-06 19:04:12
Hash : 162942f1
Message : Perform contraint validation against 9.9.9.9 and 2620:fe::fe also (which avoids DNS lookups entirely, but yes this https is correctly validated) long discussions with otto, florian, and the quad9 crew.

etc/ntpd.conf

# $OpenBSD: ntpd.conf,v 1.16 2019/11/06 19:04:12 deraadt Exp $
#
# See ntpd.conf(5) and /etc/examples/ntpd.conf

servers pool.ntp.org
server time.cloudflare.com
sensor *

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