TIMED(2)                                                 TIMED(2)



     NAME
          timed - time server daemon

     SYNOPSIS
          /etc/timed [ -t ] [ -M ] [ -n network ] [ -i network ]

     DESCRIPTION
          Timed is the time server daemon and is normally  invoked  at
          boot  time from the rc0(1M) file. It synchronizes the host's
          time with the time of other machines in a local area network
          running  timed(2).   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(2) 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
          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(2), 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(2).  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



     Page 1                                        (last mod. 8/20/87)

     TIMED(2)                                                 TIMED(2)



          /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(2),
          TSP: The Time Synchronization Protocol for UNIX  4.3BSD,  R.
          Gusella and S. Zatti

     ORIGIN
          4.3 BSD













































     Page 2                                        (last mod. 8/20/87)