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 xntpdc(1M)                                                       xntpdc(1M)

 NAME    [Toc]    [Back]
      xntpdc - special NTP query program

 SYNOPSIS    [Toc]    [Back]
      xntpdc [ -dilnps ] [ -c command ] [ host ] [ ... ]

 DESCRIPTION    [Toc]    [Back]
      xntpdc is used to query the xntpd daemon about its current state and
      to request changes in that state. The program may be run either in
      interactive mode or controlled mode using command line arguments.
      Extensive state and statistics information is available through the
      xntpdc interface. In addition, nearly all the configuration options
      which can be specified at start up using xntpd's configuration file
      may also be specified at run time using xntpdc.  If one or more
      request options is included on the command line when xntpdc 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, xntpdc 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.  xntpdc will
      prompt for commands if the standard input is a terminal device.

      xntpdc uses NTP mode 7 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.  xntpdc makes no attempt to retransmit requests,
      and will timeout requests if the remote host is not heard from within
      a suitable timeout time.

      The operation of xntpdc is specific to the particular implementation
      of the xntpd daemon and can be expected to work only with this and
      maybe some previous versions of the daemon. Requests from a remote
      xntpdc program which affect the state of the local server must be
      authenticated, which requires both the remote program and local server
      to share a common key and key identifier.

    COMMAND LINE OPTIONS    [Toc]    [Back]
      Specifying a command line option other than -i or -n will cause the
      specified query (or queries) to be sent to the indicated host(s)
      immediately. Otherwise, xntpdc will attempt to read interactive format
      commands from the standard input.

      -c command     The following command 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
                     commands may be given.

      -d             Debugging information is printed.

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 xntpdc(1M)                                                       xntpdc(1M)

      -i             Force xntpdc to operate in interactive mode. Prompts
                     will be written to the standard output and commands
                     read from the standard input.

      -l             Obtain a list of peers which are known to the
                     server(s). This option is equivalent to -c listpeers
                     command. See "CONTROL MESSAGE COMMANDS" below.

      -n             Output all host addresses in dotted-quad numeric format
                     (xxx.xxx.xxx.xxx) rather than converting to the
                     canonical host names.

      -p             Print a list of peers known to the server as well as a
                     summary of their state. This is equivalent to -c peers
                     command. See "CONTROL MESSAGE COMMANDS" below.

      -s             Print a list of peers known to the server as well as a
                     summary of their state, but in a slightly different
                     format than the -p command.  This is equivalent to -c
                     dmpeers command. See "CONTROL MESSAGE COMMANDS" below.

    INTERACTIVE COMMANDS    [Toc]    [Back]
      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. The output of individual
      commands may be redirected or 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 xntpdc program itself and do not result in NTP mode 7 requests
      being sent to a server. These commands are described as follows:

      ? [command_keyword]

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

      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.

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

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 xntpdc(1M)                                                       xntpdc(1M)

      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 command.

      keyid keyid         This command allows the specification of a key
                          number to be used to authenticate configuration
                          requests. The keyid must correspond to a key
                          number that the server has been configured to use
                          for this purpose.

      quit                Exit xntpdc.

      passwd              This command prompts you to type in a password
                          (which will not be echoed) which will be used to
                          authenticate configuration requests. The password
                          must correspond to the key configured for use by
                          the NTP server for this purpose if such requests
                          are to be successful.

      timeout milliseconds
                          Specify a timeout period for responses to server
                          queries. The default is about 8000 milliseconds.
                          Note that since xntpdc retries each query once
                          after a timeout, the total waiting time for a
                          timeout will be twice the timeout value set.

      Query commands result in NTP mode 7 packets containing requests for
      information being sent to the server. These are read-only commands in
      that they make no modification of the server configuration state.

           listpeers      Obtains and prints a brief list of the peers for
                          which the server is maintaining state. This list
                          should include all configured peer associations as
                          well as those peers whose stratum is such that
                          they are considered by the server to be possible
                          future synchronization candidates.

           peers          Obtains a list of peers for which the server is
                          maintaining state, along with a summary of that
                          state. Summary information includes the address of
                          the remote peer, the local interface address
                          ( if a local address has yet to be
                          determined), the stratum of the remote peer (a
                          stratum of 16 indicates the remote peer is
                          unsynchronized), the polling interval in seconds,
                          the reachability register in octal, and the
                          current estimated delay, offset and dispersion of
                          the peer, all in seconds. In addition, the
                          character in the left margin indicates the mode

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 xntpdc(1M)                                                       xntpdc(1M)

                          this peer entry is operating in.

                          +   indicates symmetric active

                          -   indicates symmetric passive

                          =   indicates the remote server is being polled in
                              client mode

                          ^   indicates the server is broadcasting to this

                          ~   indicates the remote peer is sending

                          *   indicates the peer that the server is
                              currently synchronizing to.

           The contents of the host field may be a host name, an IP address,
           a reference clock implementation name with its parameter or
           REFCLK (implementation number, parameter).  For hostnames no,
           only IP addresses will be displayed.

                A slightly different peer summary list. The output is
                similar to that of the peers command, except for the
                character in the leftmost column.  Characters only appear
                beside peers which were included in the final stage of the
                clock selection algorithm. A period (.) indicates that this
                peer was cast off in the falseticker detection.  A plus (+)
                indicates that the peer made it through. An asterisk (*)
                denotes the peer that the server is currently synchronizing

           showpeer peer_address [ ... ]
                Shows a detailed display of the current peer variables for
                one or more peers. Most of these values are described in the
                NTP Version 2 specification.

           pstats peer_address [ ... ]
                Show per-peer statistic counters associated with the
                specified peer(s).

           clockinfo clock_peer_address [ ... ]
                Obtain and print information concerning a peer clock. The
                values obtained provide information on the setting of fudge
                factors and other clock performance information.

                Obtain and print kernel phase-lock loop operating
                parameters. This information is available only if the kernel

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 xntpdc(1M)                                                       xntpdc(1M)

                has been specially modified for a precision timekeeping

           loopinfo [oneline|multiline]
                Print the values of selected loop filter variables. The loop
                filter is the part of NTP which deals with adjusting the
                local system clock. The offset is the last offset given to
                the loop filter by the packet processing code. The frequency
                is the frequency error of the local clock in parts-permillion
 (ppm). The time_const controls the stiffness of the
                phase-lock loop and thus the speed at which it can adapt to
                oscillator drift. The watchdog timer value is the number of
                seconds which have elapsed since the last sample offset was
                given to the loop filter. The oneline and multiline options
                specify the format in which this information is to be
                printed.  multiline is the default.

                Print a variety of system state variables, i.e., the state
                related to the local server.

                The system flags show various system flags, some of which
                can be set and cleared by the enable and disable
                configuration commands, respectively. The configurable flags
                are the auth, bclient, monitor, pll, pps and stats flags.
                Refer to (xntpd(1M)) for the description of these flags.

                The stability is the residual frequency error remaining
                after the system frequency correction is applied and is
                intended for maintenance and debugging. In most
                architectures, this value will initially decrease from as
                high as 500 ppm to a nominal value in the range .01 to 0.1
                ppm. If it remains high for some time after starting the
                daemon, something may be wrong with the local clock, or the
                value of the kernel variable tick may be incorrect.

                The broadcastdelay shows the default broadcast delay, as set
                by the broadcastdelay configuration command.

                The authdelay shows the default authentication delay, as set
                by the authdelay configuration command.

                Print statistics counters maintained in the protocol module.

                Print statistics counters related to memory allocation code.

                Print statistics counters maintained in the input-output

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 xntpdc(1M)                                                       xntpdc(1M)

                Print statistics counters maintained in the timer/event
                queue support code.

                Obtain and print the server's restriction list. This list is
                (usually) printed in sorted order and may help to understand
                how the restrictions are applied.

           monlist [version]
                Obtain and print traffic counts collected and maintained by
                the monitor facility. The version number should not normally
                need to be specified.

           clkbug clock_peer_address[...]
                Obtain debugging information for a reference clock driver.
                This information is provided only by some clock drivers and
                is mostly undecodable without a copy of the driver source.

      All requests which cause state changes in the server are authenticated
      by the server using a configured NTP key. This facility is disabled if
      the NTP key is not configured. The key number and the corresponding
      key must also be made known to xtnpdc.  This can be done using the
      keyid and passwd commands, the latter of which will prompt at the
      terminal for a password to use as the encryption key. You will also be
      prompted automatically for both the key number and password the first
      time a command which would result in an authenticated request to the
      server is given. Authentication not only provides verification that
      the requester has permission to make such changes, but also gives an
      extra degree of protection against transmission errors.

      Authenticated requests always include a timestamp in the packet data,
      which is included in the computation of the authentication code. This
      timestamp is compared by the server to its receive time stamp. If they
      differ by more than a small amount the request is rejected. This is
      done for two reasons. First, it makes simple replay attacks on the
      server, by someone who might be able to overhear traffic on your LAN,
      much more difficult. Second, it makes it more difficult to request
      configuration changes to your server from topologically remote hosts.
      While the reconfiguration facility will work well with a server on the
      local host, and may work adequately between time-synchronized hosts on
      the same LAN, it will work very poorly for more distant hosts. As
      such, if reasonable passwords are chosen, care is taken in the
      distribution and protection of keys and appropriate source address
      restrictions are applied, the run time reconfiguration facility should
      provide an adequate level of security.

      The following commands all make authenticated requests.

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 xntpdc(1M)                                                       xntpdc(1M)

           addpeer peer_address [keyid][version][prefer]
                   Add a configured peer association at the given address
                   and operating in symmetric active mode. Note that an
                   existing association with the same peer may be deleted
                   when this command is executed, or may simply be converted
                   to conform to the new configuration, as appropriate. If
                   the optional keyid is a nonzero integer, all outgoing
                   packets to the remote server will have an authentication
                   field (encrypted) attached with this key. If the value is
                   0 (or not given) no authentication will be done. The
                   version # can be 1, 2 or 3 and defaults to 3. The prefer
                   keyword indicates a preferred peer (and thus will be used
                   primarily for clock synchronization if possible).  The
                   preferred peer also determines the validity of the PPS
                   signal - if the preferred peer is suitable for
                   synchronization so is the PPS signal.

           addserver peer_address [keyid][version][prefer]
                   Identical to the addpeer command, except that the
                   operating mode is client.

           broadcast peer_address [keyid][version][prefer]
                   Identical to the addpeer command, except that the
                   operating mode is broadcast. In this case a valid key
                   identifier and key are required. The peer_address
                   parameter can be the broadcast address of the local
                   network or a multicast group address assigned to NTP. If
                   using a multicast address, a multicast-capable kernel is

           unconfig peer_address [...]
                   This command causes the configured bit to be removed from
                   the specified peer(s). In many cases this will cause the
                   peer association to be deleted. When appropriate,
                   however, the association may persist in an unconfigured
                   mode if the remote peer is willing to continue on in this

           fudge peer_address [time1][time2][stratum][refid]
                   This command provides a way to set certain data for a
                   reference clock. See the source listing for further

           enable [flag][...]

           disable [flag][...]
                   These commands operate in the same way as the enable and
                   disable configuration file commands of xntpd.  Described
                   below are the flags supported.

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 xntpdc(1M)                                                       xntpdc(1M)

                   auth    Enables the server to synchronize with
                           unconfigured peers only if the peer has been
                           correctly authenticated using a trusted key and
                           key identifier. The default for this flag is

                   bclient Enables the server to listen for a message from a
                           broadcast or multicast server, as in the
                           multicastclient command with default address.
                           The default for this flag is disable.

                   monitor Enables the monitoring facility. See the xntpdc
                           program and the monolist command for more
                           information. The default for this flag is enable.

                   pll     Enables the server to adjust its local clock by
                           means of NTP.  If disabled, the local clock
                           free-runs at its intrinsic time and frequency
                           offset. This flag is useful in case the local
                           clock is controlled by some other device or
                           protocol and NTP is used only to provide
                           synchronization to other clients.  In this case,
                           the local clock driver is used. The default for
                           this flag is enable.

                   pps     Enables the pulse-per-second (PPS) signal when
                           frequency and time is disciplined by the
                           precision time kernel modifications. The default
                           for this flag is disable.

                   stats   Enables the statistics facility. The default for
                           this flag is enable.

           restrict address mask flag [flag]
                   This command operates in the same way as the restrict
                   configuration file commands of xntpd.

           unrestrict address mask flag [flag]
                   Unrestrict the matching entry from the restrict list.

           delrestrict address mask [nttport]
                   Delete the matching entry from the restrict list.

                   Causes the current set of authentication keys to be
                   purged and a new set to be obtained by rereading the keys
                   file (which must have been specified in the xntpd
                   configuration file). This allows encryption keys to be
                   changed without restarting the server.

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 xntpdc(1M)                                                       xntpdc(1M)

           trustkey [keyid][...]

           untrustkey [keyid][...]
                   These commands operate in the same way as the trustedkey
                   and untrustkey configuration file commands of xntpd.

                   Returns information concerning the authentication module,
                   including known keys and counts of encryptions and
                   decryptions which have been done.

           traps   Display the traps set in the server. See the source
                   listing for further information.

           addtrap [address][port][interface]
                   Set a trap for asynchronous messages. See the source
                   listing for further information.

           clrtrap [address][port][interface]
                   Clear a trap for asynchronous messages. See the source
                   listing for further information.

           reset   Clear the statistics counters in various modules of the
                   server. See the source listing for further information.

 AUTHOR    [Toc]    [Back]
      xntpdc was developed by David L. Mills.

 SEE ALSO    [Toc]    [Back]
      xntpd(1M), ntpdate(1M), ntpq(1M).

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[ Back ]
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