Provided by: ntpsec_1.1.0+dfsg1-1_amd64 bug

NAME

       ntpq - standard NTP query program

SYNOPSIS

       ntpq [-46adhinpkwWu] [-c command] [host] [...]

DESCRIPTION

       The ntpq utility program is used to monitor NTP daemon ntpd operations and determine
       performance. It uses the standard NTP mode 6 control message formats defined in Appendix B
       of the NTPv3 specification RFC 1305. The same formats are used in NTPv4, although some of
       the variable names have changed and new ones added. The description on this page is for
       the NTPv4 variables.

       The program can be run either in interactive mode or controlled using command line
       arguments. Requests to read and write arbitrary variables can be assembled, with raw and
       pretty-printed output options being available. It can also obtain and print a list of
       peers in a common format by sending multiple queries to the server.

       If one or more request options is included on the command line when ntpq is executed, each
       of the requests will be sent to the NTP servers running on each of the hosts given as
       command line arguments, or on localhost by default. If no request options are given, ntpq
       will attempt to read commands from the standard input and execute these on the NTP server
       running on the first host given on the command line, again defaulting to localhost when no
       other host is specified. ntpq will prompt for commands if the standard input is a terminal
       device.

       ntpq uses NTP mode 6 packets to communicate with the NTP server, and hence can be used to
       query any compatible server on the network which permits it. Note that since NTP is a UDP
       protocol this communication will be somewhat unreliable, especially over large distances
       in terms of network topology. ntpq makes one attempt to retransmit requests, and will time
       requests out if the remote host is not heard from within a suitable timeout time.

       Note that in contexts where a host name is expected, a -4 qualifier preceding the host
       name forces DNS resolution to the IPv4 namespace, while a -6 qualifier forces DNS
       resolution to the IPv6 namespace.

       For examples and usage, see the NTP Debugging Techniques page.

       For a simpler near-real-time monitor, see ntpmon(1).

OPTIONS

       Command line options are described following. Specifying the command line options -c or -p
       will cause the specified query (queries) to be sent to the indicated host(s) immediately.
       Otherwise, ntpq will attempt to read interactive format commands from the standard input.

       -4, --ipv4
           Force DNS resolution of following host names on the command line to the IPv4
           namespace.

       -6, --ipv6
           Force DNS resolution of following host names on the command line to the IPv6
           namespace.

       -a num, --authentication=num
           Enable authentication with the numbered key.

       -c cmd, --command=cmd
           The following argument is interpreted as an interactive format command and is added to
           the list of commands to be executed on the specified host(s). Multiple -c options may
           be given.

       -d, --debug
           Increase debugging level by 1.

       -D num, --set-debug-level=num
           The debug level is set to the following integer argument.

       -l filename, --logfile=filename
           Log debugging output to the specified file.

       -h, --help
           Print a usage message summarizing options end exit.

       -n, --numeric
           Output all host addresses in numeric format rather than converting to the canonical
           host names. You may get hostnames anyway for peers in initialization phase, before DNS
           has resolved the peer name.

       -p, --peers
           Print a list of the peers known to the server as well as a summary of their state.
           This is equivalent to the peers interactive command.

       -k filename, --keyfile=filename
           Specify a keyfile. ntpq will look in this file for the key specified with -a.

       -V, --version
           Print the version string and exit.

       -w, --wide
           Wide mode: if the host name or IP Address doesn’t fit, write the full name/address and
           indent the next line so columns line up. The default truncates the name or address.

       -W num, --width=num
           Force the terminal width. Only relevant for composition of the peers display.

       -u, --units
           Display timing information with units.

INTERNAL COMMANDS

       Interactive format commands consist of a keyword followed by zero to four arguments. Only
       enough characters of the full keyword to uniquely identify the command need be typed. The
       output of a command is normally sent to the standard output, but optionally the output of
       individual commands may be sent to a file by appending a >, followed by a file name, to
       the command line. A number of interactive format commands are executed entirely within the
       ntpq program itself and do not result in NTP mode-6 requests being sent to a server. These
       are described following.

       ? [command_keyword], help [command_keyword]
           A ?  by itself will print a list of all the command keywords known to ntpq. A ?
           followed by a command keyword will print function and usage information about the
           command.

       addvars name [ = value] [...]; rmvars name [...]; clearvars
           The arguments to this command consist of a list of items of the form name = value,
           where the = value is ignored, and can be omitted in read requests.  ntpq maintains an
           internal list in which data to be included in control messages can be assembled, and
           sent using the readlist and writelist commands described below. The addvars command
           allows variables and optional values to be added to the list. If more than one
           variable is to be added, the list should be comma-separated and not contain white
           space. The rmvars command can be used to remove individual variables from the list,
           while the clearlist command removes all variables from the list.

       authenticate [yes | no]
           Normally ntpq does not authenticate requests unless they are write requests. The
           command authenticate yes causes ntpq to send authentication with all requests it
           makes. Authenticated requests causes some servers to handle requests slightly
           differently. The command authenticate without arguments causes ntpq to display whether
           or not ntpq is currently authenticating requests.

       cooked
           Display server messages in prettyprint format.

       debug more | less | off
           Turns internal query program debugging on and off.

       logfile <stderr> | filename
           Displays or sets the file for debug logging. <stderr> will send logs to standard
           error.

       delay milliseconds
           Specify a time interval to be added to timestamps included in requests which require
           authentication. This is used to enable (unreliable) server reconfiguration over long
           delay network paths or between machines whose clocks are unsynchronized. Actually the
           server does not now require timestamps in authenticated requests, so this command may
           be obsolete.

       exit
           Exit ntpq.

       host name
           Set the host to which future queries will be sent. The name may be either a DNS name
           or a numeric address.

       hostnames [yes | no]
           If yes is specified, host names are printed in information displays. If no is
           specified, numeric addresses are printed instead. The default is yes, unless modified
           using the command line -n switch.

       keyid keyid
           This command specifies the key number to be used to authenticate configuration
           requests. This must correspond to a key ID configured with the controlkey command in
           the server’s ntp.conf

       keytype
           Specify the digest algorithm to use for authenticated requests, with default MD5. The
           keytype must match what the server is expecting for the the specified key ID.

       ntpversion 1 | 2 | 3 | 4
           Sets the NTP version number which ntpq claims in packets. Defaults to 2, Note that
           mode-6 control messages (and modes, for that matter) didn’t exist in NTP version 1.

       passwd
           This command prompts for a password to authenticate requests. The password must match
           what the server is expecting. Passwords longer than 20 bytes are assumed to be hex
           encoding.

       quit
           Exit ntpq.

       raw
           Display server messages as received and without reformatting. The only
           formatting/interpretation done on the data is to transform nonascii data into a
           printable (but barely understandable) form.

       timeout milliseconds
           Specify a timeout period for responses to server queries. The default is about 5000
           milliseconds. Note that since ntpq retries each query once after a timeout, the total
           waiting time for a timeout will be twice the timeout value set.

       units
           Toggle whether times in the peers display are shown with units.

       version
           Print the version of the ntpq program.

CONTROL MESSAGE COMMANDS

       Association IDs are used to identify system, peer and clock variables. System variables
       are assigned an association ID of zero and system name space, while each association is
       assigned a nonzero association ID and peer namespace. Most control commands send a single
       mode-6 message to the server and expect a single response message. The exceptions are the
       peers command, which sends a series of messages, and the mreadlist and mreadvar commands,
       which iterate over a range of associations.

       associations
           Display a list of mobilized associations in the form

               ind assid status conf reach auth condition last_event cnt

           ┌───────────┬──────────────────────────────────┐
           │Variable   │ Description                      │
           ├───────────┼──────────────────────────────────┤
           │ind        │ index on this list               │
           ├───────────┼──────────────────────────────────┤
           │assid      │ association ID                   │
           ├───────────┼──────────────────────────────────┤
           │status     │ peer status word                 │
           ├───────────┼──────────────────────────────────┤
           │conf       │ yes: persistent, no: ephemeral   │
           ├───────────┼──────────────────────────────────┤
           │reach      │ yes: reachable, no: unreachable  │
           ├───────────┼──────────────────────────────────┤
           │auth       │ ok, yes, bad and none            │
           ├───────────┼──────────────────────────────────┤
           │condition  │ selection status (see the select │
           │           │ field of the peer status word)   │
           ├───────────┼──────────────────────────────────┤
           │last_event │ event report (see the event      │
           │           │ field of the peer status word)   │
           ├───────────┼──────────────────────────────────┤
           │cnt        │ event count (see the count field │
           │           │ of the peer status word)         │
           └───────────┴──────────────────────────────────┘

       authinfo
           Display the authentication statistics.

       clockvar assocID [name [ = value [...] ][...], cv assocID [name [ = value [...] ][...]
           Display a list of clock variables for those associations supporting a reference clock.

       :config [...]
           Send the remainder of the command line, including whitespace, to the server as a
           run-time configuration command in the same format as the configuration file. This
           command is experimental until further notice and clarification. Authentication is of
           course required.

       config-from-file filename
           Send the each line of filename to the server as run-time configuration commands in the
           same format as the configuration file. This command is experimental until further
           notice and clarification. Authentication is required.

       ifstats
           Display statistics for each local network address. Authentication is required.

       iostats
           Display network and reference clock I/O statistics.

       kerninfo
           Display kernel loop and PPS statistics. As with other ntpq output, times are in
           milliseconds. The precision value displayed is in milliseconds as well, unlike the
           precision system variable.

       lassociations
           Perform the same function as the associations command, except display mobilized and
           unmobilized associations.

       lpeers [-4 | -6]
           Print a peer spreadsheet for the appropriate IP version(s).  dstadr (associated with
           any given IP version).

       monstats
           Display monitor facility statistics.

       direct
           Normally, the mrulist command retrieves an entire MRUreport (possibly consisting of
           more than one MRU span), sorts it, and presents the result. But attempting to fetch an
           entire MRU report may fail on a server so loaded that none of its MRU entries age out
           before they are shipped. With this option, each segment is reported as it arrives.

       mrulist [limited | kod | mincount=count | laddr=localaddr | sort=sortorder |
       resany=hexmask | resall=hexmask]
           Obtain and print traffic counts collected and maintained by the monitor facility. This
           is useful for tracking who uses or abuses your server.

           With the exception of sort=sortorder, the options filter the list returned by ntpd.
           The limited and kod options return only entries representing client addresses from
           which the last packet received triggered either discarding or a KoD response. The
           mincount=count option filters entries representing less than count packets. The
           laddr=localaddr option filters entries for packets received on any local address other
           than localaddr.  resany=hexmask and resall=hexmask filter entries containing none or
           less than all, respectively, of the bits in hexmask, which must begin with 0x.

           The sortorder defaults to lstint and may be any of addr, count, avgint, lstint, or any
           of those preceded by a minus sign (hyphen) to reverse the sort order. The output
           columns are:

       ┌───────────────┬──────────────────────────────────┐
       │               │                                  │
       │Column         │ Description                      │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │lstint         │ Interval in s between the        │
       │               │ receipt of the most recent       │
       │               │ packet from this address and the │
       │               │ completion of the retrieval of   │
       │               │ the MRU list by ntpq.            │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │avgint         │ Average interval in s between    │
       │               │ packets from this address.       │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │rstr           │ Restriction flags associated     │
       │               │ with this address. Most are      │
       │               │ copied unchanged from the        │
       │               │ matching restrict command,       │
       │               │ however 0x400 (kod) and 0x20     │
       │               │ (limited) flags are cleared      │
       │               │ unless the last packet from this │
       │               │ address triggered a rate control │
       │               │ response.                        │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │r              │ Rate control indicator, either a │
       │               │ period, L or K for no rate       │
       │               │ control response, rate limiting  │
       │               │ by discarding, or rate limiting  │
       │               │ with a KoD response,             │
       │               │ respectively.                    │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │m              │ Packet mode.                     │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │v              │ Packet version number.           │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │count          │ Packets received from this       │
       │               │ address.                         │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │rport          │ Source port of last packet from  │
       │               │ this address.                    │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │remote address │ DNS name, numeric address, or    │
       │               │ address followed by claimed DNS  │
       │               │ name which could not be verified │
       │               │ in parentheses.                  │
       └───────────────┴──────────────────────────────────┘

       mreadvar assocID assocID [ variable_name [ = value[ ... ], mrv assocID assocID [
       variable_name [ = value[ ... ]
           Perform the same function as the readvar command, except for a range of association
           IDs. This range is determined from the association list cached by the most recent
           associations command.

       opeers
           Obtain and print the old-style list of all peers and clients showing dstadr
           (associated with any given IP version), rather than the refid.

       passociations
           Perform the same function as the associations command, except that it uses previously
           stored data rather than making a new query.

       peers
           Display a list of peers in the form

           tally remote refid st t when pool reach delay offset jitter

       ┌─────────┬──────────────────────────────────┐
       │         │                                  │
       │Variable │ Description                      │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │tally    │ single-character code indicating │
       │         │ current value of the select      │
       │         │ field of the peer status word    │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │remote   │ host name (or IP number) of peer │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │refid    │ association ID or kiss code      │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │st       │ stratum                          │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │t        │ u: unicast or manycast client,   │
       │         │ l: local (reference clock), s:   │
       │         │ symmetric (peer), server, B:     │
       │         │ broadcast server,                │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │when     │ sec/min/hr since last received   │
       │         │ packet                           │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │poll     │ poll interval (log2 s)           │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │reach    │ reach shift register (octal)     │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │delay    │ roundtrip delay                  │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │offset   │ offset of server relative to     │
       │         │ this host                        │
       ├─────────┼──────────────────────────────────┤
       │         │                                  │
       │jitter   │ jitter                           │
       └─────────┴──────────────────────────────────┘

       The tally code is one of the following:

       ┌─────┬──────────────────────────────────┐
       │     │                                  │
       │Code │ Description                      │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │     │ discarded as not valid           │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │x    │ discarded by intersection        │
       │     │ algorithm                        │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │.    │ discarded by table overflow (not │
       │     │ used)                            │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │-    │ discarded by the cluster         │
       │     │ algorithm                        │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │+    │ included by the combine          │
       │     │ algorithm                        │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │#    │ backup (more than tos maxclock   │
       │     │ sources)                         │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │*    │ system peer                      │
       ├─────┼──────────────────────────────────┤
       │     │                                  │
       │o    │ PPS peer (when the prefer peer   │
       │     │ is valid)                        │
       └─────┴──────────────────────────────────┘

       apeers
           Display a list of peers in the form:

               [tally]remote refid assid st t when pool reach delay offset jitter

           where the output is just like the peers command except that the refid is displayed in
           hex format and the association number is also displayed.

       pstats assocID
           Show the statistics for the peer with the given assocID.

       readvar assocID [ name ] [,...], rv assocID [ name ] [,...]
           Display the specified variables. If assocID is zero, the variables are from the system
           variables name space, otherwise they are from the peer variables name space. The
           assocID is required, as the same name can occur in both spaces. If no name is
           included, all operative variables in the name space are displayed. In this case only,
           if the assocID is omitted, it is assumed zero. Multiple names are specified with comma
           separators and without whitespace. Note that time values are represented in
           milliseconds and frequency values in parts-per-million (PPM). Some NTP timestamps are
           represented in the format YYYYMMDDTTTT, where YYYY is the year, MM the month of year,
           DD the day of month and TTTT the time of day.

       reslist
           Show the access control (restrict) list for ntpq.

       timerstats
           Display interval timer counters.

       writelist assocID
           Write the system or peer variables included in the variable list.

       writevar assocID name = value [,...]
           Write the specified variables. If the assocID is zero, the variables are from the
           system variables name space, otherwise they are from the peer variables name space.
           The assocID is required, as the same name can occur in both spaces.

       sysinfo
           Display operational summary.

       sysstats
           Print statistics counters maintained in the protocol module.

AUTHENTICATION

       Four commands require authentication to the server: config-from-file, config, ifstats, and
       reslist. An authkey file must be in place and a control key declared in ntp.conf for these
       commands to work.

       If you are running as root or otherwise have read access to the authkey and ntp.conf file,
       ntpq will mine the required credentials for you. Otherwise you will be prompted to enter a
       key ID and password.

       Credentials, once entered, are retained and used for the duration of your ntpq session.

STATUS WORDS AND KISS CODES

       The current state of the operating program is shown in a set of status words maintained by
       the system and each association separately. These words are displayed in the rv and as
       commands both in hexadecimal and decoded short tip strings. The codes, tips and short
       explanations are on the Event Messages and Status Words page. The page also includes a
       list of system and peer messages, the code for the latest of which is included in the
       status word.

       Information resulting from protocol machine state transitions is displayed using an
       informal set of ASCII strings called kiss codes. The original purpose was for
       kiss-o'-death (KoD) packets sent by the server to advise the client of an unusual
       condition. They are now displayed, when appropriate, in the reference identifier field in
       various billboards.

SYSTEM VARIABLES

       The following system variables appear in the rv billboard. Not all variables are displayed
       in some configurations.

       ┌───────────┬─────────────────────────────────┐
       │           │                                 │
       │Variable   │ Description                     │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │status     │ system status word              │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │version    │ NTP software version and build  │
       │           │ time                            │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │processor  │ hardware platform and version   │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │system     │ operating system and version    │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │leap       │ leap warning indicator (0-3)    │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │stratum    │ stratum (1-15)                  │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │precision  │ precision (log2 s)              │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │rootdelay  │ total roundtrip delay to the    │
       │           │ primary reference clock         │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │rootdisp   │ total dispersion to the primary │
       │           │ reference clock                 │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │peer       │ system peer association ID      │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │tc         │ time constant and poll exponent │
       │           │ (log2 s) (3-17)                 │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │mintc      │ minimum time constant (log2 s)  │
       │           │ (3-10)                          │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │clock      │ date and time of day            │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │refid      │ reference ID or kiss code       │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │reftime    │ reference time                  │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │offset     │ combined offset of server       │
       │           │ relative to this host           │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │sys_jitter │ combined system jitter          │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │frequency  │ frequency offset (PPM) relative │
       │           │ to hardware clock               │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │clk_wander │ clock frequency wander (PPM)    │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │clk_jitter │ clock jitter                    │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │tai        │ TAI-UTC offset (s)              │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │leapsec    │ NTP seconds when the next leap  │
       │           │ second is/was inserted          │
       ├───────────┼─────────────────────────────────┤
       │           │                                 │
       │expire     │ NTP seconds when the NIST       │
       │           │ leapseconds file expires        │
       └───────────┴─────────────────────────────────┘

       The jitter and wander statistics are exponentially-weighted RMS averages. The system
       jitter is defined in the NTPv4 specification; the clock jitter statistic is computed by
       the clock discipline module.

PEER VARIABLES

       The following peer variables appear in the rv billboard for each association. Not all
       variables are displayed in some configurations.

       ┌───────────────┬──────────────────────────────────┐
       │               │                                  │
       │Variable       │ Description                      │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │associd        │ association ID                   │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │status         │ peer status word                 │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │srcadr srcport │ source (remote) IP address and   │
       │               │ port                             │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │dstadr dstport │ destination (local) IP address   │
       │               │ and port                         │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │leap           │ leap indicator (0-3)             │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │stratum        │ stratum (0-15)                   │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │precision      │ precision (log2 s)               │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │rootdelay      │ total roundtrip delay to the     │
       │               │ primary reference clock          │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │rootdisp       │ total root dispersion to the     │
       │               │ primary reference clock          │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │refid          │ reference ID or kiss code        │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │reftime        │ reference time                   │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │reach          │ reach register (octal)           │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │unreach        │ unreach counter                  │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │hmode          │ host mode (1-6)                  │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │pmode          │ peer mode (1-5)                  │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │hpoll          │ host poll exponent (log2 s)      │
       │               │ (3-17)                           │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │ppoll          │ peer poll exponent (log2 s)      │
       │               │ (3-17)                           │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │headway        │ headway (see Rate Management and │
       │               │ the Kiss-o'-Death Packet)        │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │flash          │ flash status word                │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │offset         │ filter offset                    │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │delay          │ filter delay                     │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │dispersion     │ filter dispersion                │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │jitter         │ filter jitter                    │
       ├───────────────┼──────────────────────────────────┤
       │               │                                  │
       │bias           │ fudge for asymmetric links/paths │
       └───────────────┴──────────────────────────────────┘

CLOCK VARIABLES

       The following clock variables appear in the cv billboard for each association with a
       reference clock. Not all variables are displayed in some configurations.

       ┌───────────┬──────────────────────────────────┐
       │           │                                  │
       │Variable   │ Description                      │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │associd    │ association ID                   │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │status     │ clock status word                │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │device     │ device description               │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │timecode   │ ASCII time code string (specific │
       │           │ to device)                       │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │poll       │ poll messages sent               │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │noreply    │ no reply                         │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │badformat  │ bad format                       │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │baddata    │ bad date or time                 │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │fudgetime1 │ fudge time 1                     │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │fudgetime2 │ fudge time 2                     │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │stratum    │ driver stratum                   │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │refid      │ driver reference ID              │
       ├───────────┼──────────────────────────────────┤
       │           │                                  │
       │flags      │ driver flags                     │
       └───────────┴──────────────────────────────────┘

COMPATIBILITY

       When listing refids, addresses of the form 127.127.x.x are no longer automatically
       interpreted as local refclocks as in older versions of ntpq. Instead, a clock-format
       display is requested by the NTPsec daemon when appropriate (by setting the srcaddr peer
       variable). This means that when used to query legacy versions of ntpd, which do not know
       how to request this, this program will do a slightly wrong thing.

       In older versions, the type variable associated with a reference clock was a numeric
       driver type index. It has been replaced by name, a shortname for the driver type.

       In older versions, no count of control packets was listed under sysstats.

       The -O (--old-rv) option of legacy versions has been retired.

KNOWN LIMITATIONS

       It is possible for a ":config unpeer" command to fail silently, yielding "Config
       Succeeded", if it is given a peer identifier that looks like a driver type name or a
       hostname not present in the peer list. The error will however be reported in the system
       log.

       The config command cannot be used to change a server’s default restrictions.

       Under some circumstances python 2 cannot emit unicode. When true, the display of units is
       downgraded to non-unicode alternatives. One place a user is likely to encounter this is
       when diverting output through a pipe. Attempts have been made to force the use of UTF-8,
       all of which break the command history feature.

       When using the -u option, very old xterms may fail to render correctly. If this happens,
       be sure your xterm is started with the -u8 option, or the utf8 resource', and that your
       console font contains the UTF-8 &mu character. Also confirm your LANG environment variable
       is set to a UTF-8 language, like this: "export LANG=en_US.utf8".

       Timestamp interpretation in this program is likely to fail in flaky ways if the local
       system clock has not already been approximately synchronized to UTC. Querying a server
       based in a different NTP era than the current one is especially likely to fail.

       This program will behave in apparently buggy and only semi-predictable ways when fetching
       MRU lists from any server with sufficiently high traffic.

       The problem is fundamental. The Mode 6 protocol can’t ship (and your client cannot accept)
       MRU records as fast as the daemon accepts incoming traffic. Under these circumstances, the
       daemon will repeatedly fail to ship an entire report, leading to long hangs as your client
       repeatedly re-sends the request. Eventually the Mode 6 client library will throw an error
       indicating that a maximum number of restarts has been exceeded.

       To avoid this problem, avoid monitoring over links that don’t have enough capacity to
       handle the monitored server’s entire NTP load.

       You may be able to retrieve partial data in very high-traffic conditions by using the
       direct option.

EXIT STATUS

       One of the following exit values will be returned:

       0 (EXIT_SUCCESS)
           Successful program execution.

       1 (EXIT_FAILURE)
           The operation failed or the command syntax was not valid.