ntptrace(1M)

NAME | SYNOPSIS | RESTRICTIONS | DESCRIPTION | OPTIONS | EXAMPLES | ATTRIBUTES | SEE ALSO | BUGS | NOTES

NAME

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

SYNOPSIS

ntptrace [ -vdn ] [ -r retries ] [ -t timeout ] [ server ]

RESTRICTIONS

The only authentication scheme supported is MD5.

The only reference clock driver supported in the undisciplined local clock.

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 its search with localhost.

OPTIONS

-d

Turns on 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.

EXAMPLES

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Example 1 Sample output of ntptrace




Here is an example of the output from ntptrace:

$ rsh <server1> ntptrace <localhost>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 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.

• The reference clock ID (only for stratum-1 servers).

All times are given in seconds. Synchronization distance is a measure of the reliability of the clock's time. Note that the stratum is the server hop count to the primary source, while the synchronization distance is the estimated error relative to the primary source. These terms are precisely defined in RFC-1305.

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ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

ntpdate(1M), ntpq(1M), ntpd(1M), attributes(5)

BUGS

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

NOTES

The version of NTP incorporated in ChorusOS is ntp-4.0.99i.

ChorusOS 4.0  Last Revised December 2001

NAME | SYNOPSIS | RESTRICTIONS | DESCRIPTION | OPTIONS | EXAMPLES | ATTRIBUTES | SEE ALSO | BUGS | NOTES