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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)

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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)

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