NTPDC(8)NTPDC(8)NAMEntpdc - monitor operation of ntp daemon
SYNOPSIS
/usr/etc/ntpdc [-n] [-v] hosts...
DESCRIPTIONntpdc 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 standard 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 (mentioned 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 to this peer (see RFC-1059).
Delay: Round-trip delay in milliseconds for this peer as of the latest
poll.
Disp: Current value of dispersion (see RFC-1059) in milliseconds 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, followed 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 second (about 2^-6) and would be indicated by
a precision of -6.
Syn distance: 0
Synchronizing distance. Always zero in the current
implementation.
disp: nn
Dispersion.
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 neighbor.
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 ALSOntpd(8), ntp(8)
RFC-1059 Network Time Protocol, Mills, D.L.
10 March 1989 NTPDC(8)
