1NTPDC(8) System Manager's Manual NTPDC(8)
2
6 ntpdc - monitor operation of ntp daemon
7
9 ntpdc [-n] [-v] hosts...
10
12 ntpdc sends an INFO_QUERY packet to an ntp daemon running on the given
13 hosts. Each daemon responds with information about each of its peers,
14 which ntpdc formats on the standard output.
15 Normally, the name of the responding host and its peers are printed.
17 The -n switch disables this, printing only internet addresses.
18 Default is a terse, table-style report. The -t switch generates an
20 alternate form of the terse report. The -v switch generates a verbose
21 report.
22
25 A typical terse report looks like:
26 (rem) Address (lcl) Strat Poll Reach Delay Offset Disp
28 ==========================================================================
29 -umd1 128.8.10.14 1 64 266 3.0 -65.0 0.0
30 *DCN1.ARPA 128.8.10.14 1 256 332 155.0 -4.0 0.0
31 128.8.251.92 128.8.10.14 2 64 367 -16.0 -61.0 0.0
32 idunno.Princeto 128.8.10.14 3 64 252 60.0 -53.0 0.0
33 leo 128.8.10.14 2 64 275 4.0 -273.0 1536.2
34 The alternate form is only slightly different; it looks like:
37 Address Reference Strat Poll Reach Delay Offset Disp
39 ==========================================================================
40 -umd1 WWVB 1 64 266 3.0 -65.0 0.0
41 *DCN1.ARPA WWVB 1 256 332 155.0 -4.0 0.0
42 128.8.251.92 umd1 2 64 367 -16.0 -61.0 0.0
43 idunno.Prince trantor 3 64 252 60.0 -53.0 0.0
44 leo umd1 2 64 275 4.0 -273.0 1536.2
45 Fields are interpreted as follows:
48 - or *:
50 The - mark indicates a pre-configured peer (mentioned in
51 ntp.conf). the * mark shows which pre-configured peer (if any)
52 is currently being used for synchronization.
53 (rem) address:
55 The remote host name or internet address of a peer.
56 (lcl) address:
58 The "local" host as specified as an argument to ntpdc.
59 Reference:
61 The reference time source being used for synchronization by the
62 peer.
63 Strat: The stratum level of the peer (as perceived by the local host).
65 Poll: Current polling interval in seconds for this peer.
67 Reach: Octal value of a shift register indicating which responses were
69 received from the previous 8 polls to this peer (see RFC-????).
70 Delay: Round-trip delay in milliseconds for this peer as of the latest
72 poll.
73 Disp: Current value of dispersion (see RFC-????) in milliseconds for
75 this peer.
76
79 When the -v flag is given a series of verbose reports are presented. A
80 typical one looks like this:
81 Neighbor address 128.4.0.6 port:123 local address 192.35.201.47
83 Reach: 0376 stratum: 1 poll int(HPI): 10 precision: -10
84 Sync distance: 0 disp: 0.014000 flags: 0 leap: 0
85 Reference clock ID: WWV timestamp: a7c2832e.6f9d0000
86 Poll int(MPI): 10 threshold: 1024 timer: 1024 send: 266 received: 192 samples: 9
87 Delay(ms) 1144.00 1296.00 1118.00 1115.00 1225.00 1129.00 1086.00 1087.00
88 Offset(ms) 19.00 92.00 -17.00 12.00 41.00 4.00 -1.00 -14.00
89 delay: 1086.000000 offset: -1.000000 dsp 0.014000
91 Fields are interpreted as follows:
94 Neighbor address...:
96 The address and port number of this neighbor, followed by the
97 local address.
98 Reach: nn
100 Reachability in response to last 8 polls (octal value of shift
101 register)
102 stratum: n
104 Stratum level.
105 poll interval: time
107 precision: nn
109 The precision of this clock, given in seconds as a power of 2.
110 e.g A clock derived from the power line frequency (60 Hz) has a
111 precision of 1/60 second (about 2^-6) and would be indicated by
112 a precision of -6.
113 Syn distance: 0
115 Synchronizing distance. Always zero in the current implementa‐
116 tion.
117 disp: nn
119 Dispersion.
120 flags: nn
122 leap: flag
124 The leap second indicator. Non-zero if there is to be a leap
125 second added or subtracted at the new year.
126 Reference clock ID: [address]
128 timestamp: nn
130 Poll interval: time
132 threshold: nn
134 timer: nn
136 send: nn
138 The number of ntp packets sent to this neighbor.
139 received: nn
141 The number of ntp packets received from this neighbor.
142 samples: nn
144 Delay and Offset
146 The round-trip delay and clock offset for the last eight ntp
147 packet exchanges. If there are fewer than eight valid samples,
148 the delay field will be zero.
149 delay: avg-delay offset: avg-offset dsp ???
151 Average delay, offset, and dispersion calculated from the above
152 samples. Meanings...???
153
156 Probably a few. Report bugs to Louis A. Mamakos (louie@tran‐
157 tor.umd.edu).
158
161 RFC-???? Network Time Protocol(1), Dave Mills and ...
162 ntpd(8), ntp(8)
163 10 March 1989 NTPDC(8)