.\" $OpenBSD: ntpd.8,v 1.4 2004/07/09 19:33:09 jmc Exp $
.\"
.\" Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
.\" AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
.\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd July 9, 2004
.Dt NTPD 8
.Os
.Sh NAME
.Nm ntpd
.Nd "Network Time Protocol daemon"
.Sh SYNOPSIS
.Nm ntpd
.Bk -words
.Op Fl d
.Op Fl f Ar file
.Ek
.Sh DESCRIPTION
The
.Nm
daemon implements the Simple Network Time Protocol version 4 as described
in RFC 2030 and the Network Time Protocol version 3 as described in RFC 1305.
It can synchronize the local clock to one or more remote NTP servers and act
as NTP server itself, redistributing the local time.
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Do not daemonize and log to
.Em stderr .
.It Fl f Ar file
Specify an alternate location,
.Ar file ,
for the configuration file.
.El
.Sh FILES
.Bl -tag -width "/etc/ntpd.conf" -compact
.It Pa /etc/ntpd.conf
.Nm
configuration file.
.El
.Sh SEE ALSO
.Xr date 1 ,
.Xr ntpd.conf 5 ,
.Xr rdate 8 ,
.Xr timed 8
.Rs
.%R RFC 1305
.%T "Network Time Protocol (Version 3)"
.%D March 1992
.Re
.Rs
.%R RFC 2030
.%T "Simple Network Time Protocol (SNTP) Version 4"
.%D October 1996
.Re
.Sh HISTORY
The
.Nm
program first appeared in
.Ox 3.6 .