2 .\" $FreeBSD: src/usr.sbin/ntp/doc/ntptrace.8,v 1.1.2.6 2003/03/11 22:31:30 trhodes Exp $
3 .\" $DragonFly: src/usr.sbin/ntp/doc/Attic/ntptrace.8,v 1.2 2003/06/17 04:29:58 dillon Exp $
10 .Nd "trace a chain of NTP servers back to the primary source"
20 utility determines where a given Network Time Protocol (NTP) server gets
21 its time from, and follows the chain of NTP servers back to their
23 If given no arguments, it starts with
26 Here is an example of the output from
30 localhost: stratum 4, offset 0.0019529, synch distance 0.144135
31 server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
32 usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
35 On each line, the fields are (left to right): the host name, the
37 the time offset between that host and the local host
40 this is why it is not always zero for
43 synchronization distance,
44 and (only for stratum-1 servers) the reference clock ID. All times
46 Note that the stratum is the server hop count to the primary source,
47 while the synchronization distance is the estimated error
48 relative to the primary source.
49 These terms are precisely defined in RFC 1305.
51 The following options are available:
52 .Bl -tag -width indent
54 Turn on some debugging output.
56 Turn off the printing of host names; instead, host IP addresses
57 are given. This may be necessary if a nameserver is down.
59 Set the number of retransmission attempts for each host; the default is 5.
61 Set the retransmission timeout (in seconds); the default is 2.
63 Print verbose information about the NTP servers.
70 .%T Network Time Protocol (Version 3)
74 This program makes no attempt to improve accuracy by doing multiple