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timed(8)

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NAME    [Toc]    [Back]

       timed - The network time daemon

SYNOPSIS    [Toc]    [Back]

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

OPTIONS    [Toc]    [Back]

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

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

              Do  not use the -i and -n options together.  Specifies
 that a machine can become the time  server  if
              the  master  time  server  becomes inoperative. See
              RESTRICTIONS for more information.   Overrides  the
              input  of slaves.  Use the -E option in conjunction
              with the -M option.  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 option 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  option
              is  the  name  of  the  network  that  timed should
              access. If the -n option is used, only  the  specified
 networks are accessed.

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

              Do not use the -n and -i options together.  Enables
              tracing of messages received in /usr/adm/timed.log.

DESCRIPTION    [Toc]    [Back]

       The  timed  daemon is not invoked at boot time by default.
       You can use the /usr/sbin/timedsetup utility 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
       option 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  option.

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

RESTRICTIONS    [Toc]    [Back]

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

FILES    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

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

       Daemons: xntpd(8)

       Functions: adjtime(2), gettimeofday(2)



                                                         timed(8)
[ Back ]
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