timed man page on Tru64

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timed(8)							      timed(8)

NAME
       timed - The network time daemon

SYNOPSIS
       timed [-tME] [-n	 | -i network]

OPTIONS
       Specifies  the  names  of the networks (as defined in the /etc/networks
       file) to be excluded from clock synchronization. Each network name that
       is  an  argument to the -i option is added to the list of networks that
       the timed daemon will ignore.  If the -i option is used, timed accesses
       all  networks  to  which the host is connected except for the specified
       networks.

	      If neither the -i option nor the -n option is used, timed	 tries
	      to access all the network devices connected to the local host.

	      Do  not  use  the	 -i and -n options together.  Specifies that a
	      machine can become the time server if  the  master  time	server
	      becomes  inoperative.  See  RESTRICTIONS	for  more information.
	      Overrides the input of slaves.  Use the -E option in conjunction
	      with  the	 -M  option.   It specifies that a master timed system
	      will not average the times of the slaves to calculate  the  net‐
	      work  time.   Instead, it distributes the time of its local host
	      as the network time.  This option allows a master	 timed	system
	      to  distribute  time to a network while the network time is con‐
	      trolled by an outside agent (such as the Network	Time  Protocol
	      (NTP)).	Specifies the names of the networks (as defined in the
	      /etc/networks file) to be	 included  in  clock  synchronization.
	      When timed is started, it gathers information about all the net‐
	      work devices connected to the local host.	 The network  argument
	      to  the  -n  option is the name of the network that timed should
	      access. If the -n option is used, only  the  specified  networks
	      are accessed.

	      If  neither the -n option nor the -i option is used, timed tries
	      to access all the network devices connected to the local host.

	      Do not use the -n and -i options together.  Enables  tracing  of
	      messages received in /usr/adm/timed.log.

DESCRIPTION
       The  timed  daemon is not invoked at boot time by default.  You can use
       the /usr/sbin/timedsetup utility to configure the timed daemon.

       The timed daemon synchronizes the host's	 clock	with  those  of	 other
       machines on the local area network that are also running the timed dae‐
       mon. The timed daemon slows the clocks of some machines and  speeds  up
       the  clocks  on	other  machines to create an average network time. The
       average network time is computed from measurements of clock differences
       using  the  Internet  Control Message Protocol (ICMP) timestamp request
       message.

       The  service  provided  by   timed   is	 based	 on   a	  master/slave
       (client/server)	scheme.	  When	timed is started on a machine, it asks
       the master timed daemon for the network time and sets the host's	 clock
       to  that	 time.	After  that, the host accepts synchronization messages
       periodically sent by the master and calls the adjtime() system call  to
       perform the needed corrections on the host's clock.

       The  timed  daemon  also	 communicates with the date command to set the
       date globally, and with timedc, the timed control program.

       If the machine running the master ceases to function, a machine that is
       running	the  timed  daemon  with  the -M option becomes the new master
       timed daemon.

					Note

       The timed daemon is provided for compatibility. Tru64  UNIX  also  pro‐
       vides  support  for the Network Time Protocol through the xntpd daemon.
       You should use NTP for time synchronization. If you need	 to  run  both
       NTP  and	 the  timed  daemon, you must run the timed daemon with the -E
       option.

       If you plan to run both the timed daemon and NTP, you should also  con‐
       figure NTP first.

RESTRICTIONS
       In configurations with two or more hosts each connected to the same two
       or more subnetworks, only one of the hosts can run the timed daemon  by
       using the -M option.

FILES
       Specifies  the  command	path.	Contains messages traced for the timed
       command.	 Contains information about the known networks.

SEE ALSO
       Commands: date(1), timedc(8), timedsetup(8)

       Daemons: xntpd(8)

       Functions: adjtime(2), gettimeofday(2)

								      timed(8)
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