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peer address [ key key ] [ version
version ] [ prefer ]
[ minpoll minpoll [ maxpoll
maxpoll ]
server address [ key key ] [ version
version ] [ prefer ] [ mode mode ]
broadcast address [ key key ] [ version
version ] [ ttl ttl ]
peer
command specifies that the local server
is to operate in symmetric active mode with the remote server. In this
mode, the local server can be synchronized to the remote server and, in
addition, the remote server can be synchronized by the local server.
This is useful in a network of servers where, depending on various
failure scenarios, either the local or remote server may be the better
source of time.
server
command specifies that the local server
is to operate in client mode with the specified remote server. In this
mode, the local server can be synchronized to the remote server, but the
remote server can never be synchronized to the local server.
broadcast
command specifies that the local
server is to operate in broadcast mode, where the local server sends
periodic broadcast messages to a client population at the
broadcast/multicast address specified. Ordinarily, this
specification applies only to the local server operating as a sender;
for operation as a broadcast client, see the
broadcastclient
or multicastclient
commands
below. In this mode, address is usually the broadcast address on
(one of) the local network(s) or a multicast address assigned to NTP.
The Numbers Czar has assigned the address 224.0.1.1 to NTP; this is
presently the only address that should be used. Note that the use of
multicast features requires a multicast kernel, which is not yet
ubiquitous in vendor products.
key key
version version
prefer
prefer
Keyword page for further information.
ttl ttl
minpoll minpoll
maxpoll maxpoll
broadcastclient [ address
]
multicastclient [ address ] [ ... ]
broadcastclient
command, but uses IP multicasting. Support
for this command requires a multicast kernel.
driftfile driftfile
ntp.drift
file format consists of a single line
containing a single floating point number, which records the frequency
offset measured in parts-per-million (PPM). That the file is updated
once per hour by first writing the current drift value into a temporary
file and then renaming this file to replace the old version. This
implies that xntpd
must have write permission for the
directory the drift file is located in, and that file system links,
symbolic or otherwise, should probably be avoided.
enable auth | bclient | monitor | pll | pps | stats
disable auth | bclient | monitor | pll | pps | stats
xntpdc
utility program.
auth
bclient
multicastclient
command with
default address. The default for this flag is disable.
monitor
xntpdc
program
and the monlist
command or further information. The default
for this flag is enable.
pll
pps
stats
tick value
tick
can be found from the kernel, use
this value. This is the "normalized" value; if your system
keeps tick
in nanoseconds you must divide your
value by 1000. The expected range of the value is between 900
and 11,000 (don't use the comma in the config file).
tickadj value
tickadj
can be found in the
kernel, use this value. The value must be "normalized"; if
your system keeps tickadj
in nanoseconds you must
divide your value by 1000. The expected range of the value is
between 1 and 50.