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"ntptrace" "8" "" "" "System Administration Commands"
NAME
ntptrace - trace a chain of NTP hosts back to their master time source
SYNOPSIS

/usr/sbin/ntptrace [-n] [-m maxhosts] [server]
DESCRIPTION

ntptrace determines from where a given Network Time Protocol (NTP) server gets its time, 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:

-n

Turns off the printing of host names; instead, host IP addresses are given.

-m maxhosts

Sets the maximum number of levels up the chain that will be followed.

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):

The server's host name

The server's stratum

The time offset between that server and the local host (as measured by ntptrace; this is why it is not always zero for localhost)

The host's synchronization distance

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.

SEE ALSO

ntpq(8), ntpd(8), ntpdc(8), attributes(7))