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TIMED(8)										 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 network time and sets the host's clock to
       that time.  After that, it accepts synchronization messages periodically sent by the  mas-
       ter 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 synchro-
       nization 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 net-
       works(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)
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