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NAME

ntptrace - trace a chain of NTP hosts back to their master time source

SYNOPSIS

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.''

Here is an example of the output from ntptrace:

% 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 host name, the host's stratum, the time offset between that host and the local host (as measured by ntptrace; this is why it is not always zero for ``localhost''), the host's ``synchronization distance,'' and (only for stratum-1 servers) the reference clock ID. All times are given in seconds. (Synchronization distance is a measure of the goodness of the clock's time.)

OPTIONS

-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; default = 5.
-t timeout
Sets the retransmission timeout (in seconds); default = 2.
-v
Prints verbose information about the NTP servers.

SEE ALSO

xntpd(8), xntpdc(8)

BUGS

This program makes no attempt to improve accuracy by doing multiple samples.

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