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timed(8)
NAME
  timed - The network time daemon

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

FLAGS
  -i network
	    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 flag is added to
	    the list of networks that the timed daemon will ignore.  If the
	    -i flag is used, timed accesses all networks to which the host is
	    connected except for the specified networks.

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

	    Do not use the -i and -n flags together.

  -M	    Specifies that a machine can become the time server if the master
	    time server becomes inoperative.  See the Restrictions section
	    for more information.

  -E	    Overrides the input of slaves.  Use the -E flag in conjunction
	    with the -M flag.  It specifies that a master timed system will
	    not average the times of the slaves to calculate the network
	    time.  Instead, it distributes the time of its local host as the
	    network time.  This flag allows a master timed system to
	    distribute time to a network while the network time is controlled
	    by an outside agent (such as the Network Time Protocol (NTP)).

  -n network
	    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
	    network devices connected to the local host.  The network
	    argument to the -n flag is the name of the network that timed
	    should access.  If the -n flag is used, only the specified
	    networks are accessed.

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

	    Do not use the -n and -i flags together.

  -t	    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
  /usr/sbin/timedsetup 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 daemon.  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 flag becomes the new master timed
  daemon.

				     Note
       The timed daemon is provided for compatibility.	Tru64 UNIX also
       provides 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 flag.

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

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

FILES
  /usr/sbin/timed
	    Specifies the command path

  /var/adm/timed.log
	    Contains messages traced for the timed command

  /etc/networks
	    Contains information about the known networks

RELATED INFORMATION
  Commands:  date(1), timedc(8), timedsetup(8)

  Daemons: xntpd(8)

  Functions:  adjtime(2), gettimeofday(2)

Index for Section 8

Alphabetical listing for T

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