ntptrace(1M) System Administration Commands ntptrace(1M)NAMEntptrace - trace a chain of NTP hosts back to their master time source
SYNOPSIS
/usr/sbin/ntptrace [-vdn] [-r retries] [-t timeout] [server]
DESCRIPTIONntptrace 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 name‐
server 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):
· The server's host name
· The server's stratum
· The time offset between that server and the local host (as mea‐
sured by ntptrace; this is why it is not always zero for local‐
host)
· 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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWntpu │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOxntpd(1M), attributes(5)BUGS
This program makes no attempt to improve accuracy by doing multiple
samples.
SunOS 5.10 19 Mar 1998 ntptrace(1M)