ntptrace(8) BSD System Manager's Manual ntptrace(8)
NAME
ntptrace -- trace a chain of NTP servers back to the primary source
SYNOPSIS
ntptrace [-vdn] [-r retries] [-t timeout] [server]
DESCRIPTION
The ntptrace utility 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''.
Here is an example of the output from ntptrace:
% ntptrace
localhost: stratum 4, offset 0.0019529, synch distance 0.144135
server2ozo.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 host name, the host
stratum, the time offset between that host and the local host (as mea-
sured by ntptrace; this is why it is not always zero for ``localhost''),
the host synchronization distance, and (only for stratum-1 servers) the
reference clock ID. All times are given in seconds. Note that the stra-
tum is the server hop count to the primary source, while the synchroniza-
tion distance is the estimated error relative to the primary source.
These terms are precisely defined in RFC 1305.
The following options are available:
-d Turn on some debugging output.
-n Turn off the printing of host names; instead, host IP addresses
are given. This may be necessary if a nameserver is down.
-r retries
Set the number of retransmission attempts for each host; the
default is 5.
-t timeout
Set the retransmission timeout (in seconds); the default is 2.
-v Print verbose information about the NTP servers.
SEE ALSO
ntpd(8), ntpdc(8)
D L Mills, Network Time Protocol (Version 3), RFC1305.
BUGS
This program makes no attempt to improve accuracy by doing multiple sam-
ples.
BSD January 6, 2000 BSD
Mac OS X 10.7 - Generated Tue Sep 6 06:04:39 CDT 2011