NTPD(8) System Manager's Manual NTPD(8) (NAME) ntpd - (NTP) (SYNOPSIS) ntpd [-dnv] [-f file] [-p file] (DESCRIPTION) ntpd NTP . ntpd NTP . RFC 5905 RFC 1305 . TLS HTTPS (man-in-the-middle) NTP . : -d . ntpd stderr . -f file file /etc/ntpd.conf. -n (Configtest). . -v ntpd (DEBUG) syslog . -p file (PID) file ntpd adjtime(2) . syslog(3) . . ntpd -d -v adjtime(2) . ntpd . ntpd adjfreq(2) (systematic drift) . ntpd ntpd_flags /etc/rc.conf . rc(8) rc.conf(8) . ntpd ntpd.conf(5), /var/ntpd.drift . drift . (FILES) /etc/ntpd.conf . /var/ntpd.drift (drift). /var/run/ntpd.sock ntpctl(8). (SEE ALSO) date(1), adjfreq(2), adjtime(2), ntpd.conf(5), ntpctl(8), rc(8), rc.conf(8), rdate(8) (STANDARDS) David L. Mills, Network Time Protocol (Version 3): Specification, Implementation and Analysis, RFC 1305, March 1992. David L. Mills, Jim Martin, Jack Burbank, and William Kasch, Network Time Protocol Version 4: Protocol and Algorithms Specification, RFC 5905, June 2010. (HISTORY) ntpd OpenBSD 3.6 . Linux 6.12.107+deb13-amd64 March 2, 2023 Linux 6.12.107+deb13-amd64