timed - The network time daemon
timed [-tME] [-n | -i network]
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.
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 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 flag becomes the new master timed daemon.
The timed daemon is provided for compatibility. Tru64 UNIX also provides support for the Network Time Protocol through the xntpd daemon. Digital recommends you 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 configure NTP first.
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.
Specifies the command path Contains messages traced for the timed command Contains information about the known networks
Commands: date(1), timedc(8), timedsetup(8)
Functions: adjtime(2), gettimeofday(2) delim off