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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 ac- cesses all networks to which the host is connected except for the spec- ified 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 ma- chine can become the time server if the master time server be- comes inoperative. See the Restrictions section for more infor- mation. Overrides the input of slaves. Use the -E flag in con- junction 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 sys- tem to distribute time to a network while the network time is controlled by an outside agent (such as the Network Time Proto- col (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 net- work devices connected to the local host. The network argument to the -n flag is the name of the network that timed should ac- cess. 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 ma- chines 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 mes- sage. 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. Note The timed daemon is provided for compatibility. DIGITAL UNIX also pro- vides 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. 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 com- mand 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)