# 2.11BSD#431 - /usr/man/cat8/timed.0

    TIMED(8)	    UNIX Programmer'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 network 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 per-
         form 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 net-
         works  on which no current master server was detected.  Such
         a server propagates the time computed by the top-level  mas-
         ter.   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.

    Printed 11/26/99	November 17, 1996			1

    TIMED(8)	    UNIX Programmer's Manual		 TIMED(8)

    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

    Printed 11/26/99	November 17, 1996			2

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