NTPDC

NAME

SYNOPSIS

DESCRIPTION

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 ALSO

ntpd(8), ntp(8)
RFC-1059 Network Time Protocol, Mills, D.L.

Index

NAME

SYNOPSIS

DESCRIPTION

TERSE REPORT

VERBOSE REPORTS

BUGS

SEE ALSO