timed(8) [bsd man page]

TIMED(8)						      System Manager's Manual							  TIMED(8)

NAME

       timed - time server daemon

SYNOPSIS

       timed [ -t ] [ -M ] [ -n network ] [ -i network ]

DESCRIPTION

       Timed is the time server daemon and is normally invoked at boot time from the rc(8) file.  It synchronizes the host's time with the time of
       other machines in a local area network running timed(8).  These time servers will slow down the clocks of some machines and  speed  up  the
       clocks  of  others  to bring them to the average network time.  The average network time is computed from measurements of clock differences
       using the ICMP timestamp request message.

       The service provided by timed is based  on a master-slave scheme.  When timed(8) is started on a machine, it asks the master for  the  net-
       work  time  and	sets  the  host's clock to that time.  After that, it accepts synchronization messages periodically sent by the master and
       calls adjtime(2) to perform the needed corrections on the host's clock.

       It also communicates with date(1) in order to set the date globally, and with timedc(8), a timed control program.  If the  machine  running
       the  master  crashes,  then  the slaves will elect a new master from among slaves running with the -M flag.  A timed running without the -M
       flag will remain a slave.  The -t flag enables timed to trace the messages it receives in the  file  /usr/adm/timed.log.   Tracing  can	be
       turned on or off by the program timedc(8).  Timed normally checks for a master time server on each network to which it is connected, except
       as modified by the options described below.  It will request synchronization service from the first master server located.  If permitted by
       the  -M	flag,  it  will  provide  synchronization service on any attached networks on which no current master server was detected.  Such a
       server propagates the time computed by the top-level master.  The -n flag, followed by the name of a network which the host is connected to
       (see  networks(5)), overrides the default choice of the network addresses made by the program.  Each time the -n flag appears, that network
       name is added to a list of valid networks.  All other networks are ignored.  The -i flag, followed by the name of a network  to	which  the
       host  is  connected  (see  networks(5)),  overrides the default choice of the network addresses made by the program.  Each time the -i flag
       appears, that network name is added to a list of networks to ignore.  All other networks are used by the time daemon.  The -n and -i  flags
       are meaningless if used together.

FILES

       /usr/adm/timed.log	    tracing file for timed
       /usr/adm/timed.masterlog     log file for master timed

SEE ALSO

       date(1), adjtime(2), gettimeofday(2), icmp(4P), timedc(8),
       TSP: The Time Synchronization Protocol for UNIX 4.3BSD, R. Gusella and S. Zatti

4.3 Berkeley Distribution					 November 17, 1996							  TIMED(8)

timed(8)						      System Manager's Manual							  timed(8)

NAME

       timed - The network time daemon

SYNOPSIS

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

FLAGS

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

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

RELATED INFORMATION

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

       Daemons: xntpd(8)

       Functions:  adjtime(2), gettimeofday(2) delim off

																	  timed(8)