NTPDC(8) NTPDC(8)
NAME
ntpdc - monitor operation of ntp daemon
SYNOPSIS
ntpdc [-n] [-v] hosts...
DESCRIPTION
ntpdc sends an INFO_QUERY packet to an ntp daemon running
on the given hosts. Each daemon responds with information
about each of its peers, which ntpdc formats on the stan-
dard output.
Normally, the name of the responding host and its peers
are printed. The -n switch disables this, printing only
internet addresses.
Default is a terse, table-style report. The -v switch
generates a verbose report.
TERSE REPORT
A typical terse report looks like:
(rem) Address (lcl) Strat Poll Reach Delay Offset Disp
==========================================================================
-umd1 128.8.10.14 1 64 266 3.0 -65.0 0.0
*DCN1.ARPA 128.8.10.14 1 256 332 155.0 -4.0 0.0
128.8.251.92 128.8.10.14 2 64 367 -16.0 -61.0 0.0
idunno.Princeto 128.8.10.14 3 64 252 60.0 -53.0 0.0
leo 128.8.10.14 2 64 275 4.0 -273.0 1536.2
Fields are interpreted as follows:
- or *:
The - mark indicates a pre-configured peer (men-
tioned in ntp.conf). the * mark shows which pre-
configured peer (if any) is currently being used
for synchronization.
(rem) address:
The remote host name or internet address of a peer.
(lcl) address:
The "local" host as specified as an argument to
ntpdc.
Strat: The stratum level of the peer (as perceived by the
local host).
Poll: Current polling interval in seconds for this peer.
Reach: Octal value of a shift register indicating which
responses were received from the previous 8 polls
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NTPDC(8) NTPDC(8)
to this peer (see RFC-????).
Delay: Round-trip delay in milliseconds for this peer as
of the latest poll.
Disp: Current value of dispersion (see RFC-????) in mil-
liseconds for this peer.
VERBOSE REPORTS
When the -v flag is given a series of verbose reports are
presented. A typical one looks like this:
Neighbor address 128.4.0.6 port:123 local address 192.35.201.47
Reach: 0376 stratum: 1 poll int(HPI): 10 precision: -10
Sync distance: 0 disp: 0.014000 flags: 0 leap: 0
Reference clock ID: WWV timestamp: a7c2832e.6f9d0000
Poll int(MPI): 10 threshold: 1024 timer: 1024 send: 266 received: 192 samples: 9
Delay(ms) 1144.00 1296.00 1118.00 1115.00 1225.00 1129.00 1086.00 1087.00
Offset(ms) 19.00 92.00 -17.00 12.00 41.00 4.00 -1.00 -14.00
delay: 1086.000000 offset: -1.000000 dsp 0.014000
Fields are interpreted as follows:
Neighbor address...:
The address and port number of this neighbor, fol-
lowed by the local address.
Reach: nn
Reachability in response to last 8 polls (octal
value of shift register)
stratum: n
Stratum level.
poll interval: time
precision: nn
The precision of this clock, given in seconds as a
power of 2. e.g A clock derived from the power
line frequency (60 Hz) has a precision of 1/60 sec-
ond (about 2^-6) and would be indicated by a preci-
sion of -6.
Syn distance: 0
Synchronizing distance. Always zero in the current
implementation.
disp: nn
Dispersion.
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NTPDC(8) NTPDC(8)
flags: nn
leap: flag
The leap second indicator. Non-zero if there is to
be a leap second added or subtracted at the new
year.
Reference clock ID: [address]
timestamp: nn
Poll interval: time
threshold: nn
timer: nn
send: nn
The number of ntp packets sent to this neighbor.
received: nn
The number of ntp packets received from this neigh-
bor.
samples: nn
Delay and Offset
The round-trip delay and clock offset for the last
eight ntp packet exchanges. If there are fewer
than eight valid samples, the delay field will be
zero.
delay: avg-delay offset: avg-offset dsp ???
Average delay, offset, and dispersion calculated
from the above samples. Meanings...???
BUGS
Probably a few. Report bugs to Louis A. Mamakos
(louie@trantor.umd.edu).
SEE ALSO
RFC-???? Network Time Protocol(1), Dave Mills and ...
ntpd(8), ntp(8)
10 March 1989 3