1 .\" $OpenBSD: ntpd.8,v 1.5 2004/07/13 19:51:38 jmc Exp $
3 .\" Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 .\" Permission to use, copy, modify, and distribute this software for any
6 .\" purpose with or without fee is hereby granted, provided that the above
7 .\" copyright notice and this permission notice appear in all copies.
9 .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 .\" WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
14 .\" AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 .\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 .Nd "Network Time Protocol daemon"
32 daemon synchronizes the local clock to one or more remote NTP servers,
33 and can also act as an NTP server itself,
34 redistributing the local time.
35 It implements the Simple Network Time Protocol version 4,
36 as described in RFC 2030,
37 and the Network Time Protocol version 3,
38 as described in RFC 1305.
41 is usually started at boot time, and can be enabled by
42 setting the following in
43 .Pa /etc/rc.conf.local :
51 for more information on the boot process
56 starts up, it reads settings from a configuration file,
60 The options are as follows:
61 .Bl -tag -width "-f fileXXX"
64 If this option is specified,
66 will run in the foreground and log to
71 as the configuration file,
72 instead of the default
76 .Bl -tag -width "/etc/ntpd.confXXX" -compact
89 .%T "Network Time Protocol (Version 3)"
94 .%T "Simple Network Time Protocol (SNTP) Version 4"
100 program first appeared in