08-03-2009
Do you know about NTP - usually running an xntpd daemon. NTP detects time differences between servers and corrects them.
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LEARN ABOUT OPENSOLARIS
ntptrace
ntptrace(1M) System Administration Commands ntptrace(1M)
NAME
ntptrace - trace a chain of NTP hosts back to their master time source
SYNOPSIS
/usr/sbin/ntptrace [-vdn] [-r retries] [-t timeout]
[server]
DESCRIPTION
ntptrace determines where a given Network Time Protocol (NTP) server gets its time from, and follows the chain of NTP servers back to
their master time source. If given no arguments, it starts with localhost.
OPTIONS
The following options are supported:
-d Turns on some debugging output.
-n Turns off the printing of host names; instead, host IP addresses are given. This may be necessary if a nameserver is down.
-r retries Sets the number of retransmission attempts for each host.
-t timeout Sets the retransmission timeout (in seconds); default = 2.
-v Prints verbose information about the NTP servers.
EXAMPLES
Example 1 Sample Output From the ntptrace Command
The following example shows the output from the ntptrace command:
% ntptrace
localhost: stratum 4, offset 0.0019529, synch distance 0.144135
server2.bozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
On each line, the fields are (left to right):
o The server's host name
o The server's stratum
o The time offset between that server and the local host (as measured by ntptrace; this is why it is not always zero for local-
host)
o The host's synchronization distance
o The reference clock ID (only for stratum-1 servers)
All times are given in seconds. Synchronization distance is a measure of the goodness of the clock's time.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWntpu |
+-----------------------------+-----------------------------+
SEE ALSO
xntpd(1M), attributes(5)
BUGS
This program makes no attempt to improve accuracy by doing multiple samples.
SunOS 5.11 19 Mar 1998 ntptrace(1M)