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MDIG(1)                             BIND 9                             MDIG(1)

NAME
       mdig - DNS pipelined lookup utility

SYNOPSIS
       mdig  {@server}  [-f  filename]  [-h] [-v] [ [-4] | [-6] ] [-m] [-b ad-
       dress] [-p port#] [-c class] [-t type] [-i] [-x addr] [plusopt...]

       mdig {-h}

       mdig [@server] {global-opt...} { {local-opt...} {query} ...}

DESCRIPTION
       mdig is a multiple/pipelined query version of dig: instead  of  waiting
       for  a  response  after  sending  each  query, it begins by sending all
       queries. Responses are displayed in the order in  which  they  are  re-
       ceived, not in the order the corresponding queries were sent.

       mdig  options  are  a  subset  of the dig options, and are divided into
       "anywhere options," which can occur anywhere, "global  options,"  which
       must  occur before the query name (or they are ignored with a warning),
       and "local options," which apply to the next query on the command line.

       The @server option is a mandatory global option. It is the name  or  IP
       address of the name server to query. (Unlike dig, this value is not re-
       trieved from /etc/resolv.conf.) It can  be  an  IPv4  address  in  dot-
       ted-decimal notation, an IPv6 address in colon-delimited notation, or a
       hostname. When the supplied server argument is  a  hostname,  mdig  re-
       solves that name before querying the name server.

       mdig  provides  a number of query options which affect the way in which
       lookups are made and the results displayed. Some of these set or  reset
       flag bits in the query header, some determine which sections of the an-
       swer get printed, and others determine the timeout  and  retry  strate-
       gies.

       Each  query  option  is identified by a keyword preceded by a plus sign
       (+). Some keywords set or reset an option. These may be preceded by the
       string  no to negate the meaning of that keyword. Other keywords assign
       values to options like the timeout interval. They have the  form  +key-
       word=value.

ANYWHERE OPTIONS
       -f     This  option  makes mdig operate in batch mode by reading a list
              of lookup requests to process from the file filename.  The  file
              contains  a  number  of queries, one per line. Each entry in the
              file should be organized in the same way they would be presented
              as queries to mdig using the command-line interface.

       -h     This option causes mdig to print detailed help information, with
              the full list of options, and exit.

       -v     This option causes mdig to print the version number and exit.

GLOBAL OPTIONS
       -4     This option forces mdig to only use IPv4 query transport.

       -6     This option forces mdig to only use IPv6 query transport.

       -b address
              This option sets the source IP address of the query to  address.
              This must be a valid address on one of the host's network inter-
              faces or "0.0.0.0" or "::". An optional port may be specified by
              appending "#<port>"

       -m     This option enables memory usage debugging.

       -p port#
              This  option  is  used  when a non-standard port number is to be
              queried. port# is the port number that mdig  sends  its  queries
              to,  instead  of the standard DNS port number 53. This option is
              used to test a name server that has been  configured  to  listen
              for queries on a non-standard port number.

       The global query options are:

       +[no]additional
              This  option  displays [or does not display] the additional sec-
              tion of a reply. The default is to display it.

       +[no]all
              This option sets or clears all display flags.

       +[no]answer
              This option displays [or does not display] the answer section of
              a reply. The default is to display it.

       +[no]authority
              This option displays [or does not display] the authority section
              of a reply. The default is to display it.

       +[no]besteffort
              This option attempts to display [or does not display]  the  con-
              tents  of  messages  which  are malformed. The default is to not
              display malformed answers.

       +burst This option delays queries until the start of the next second.

       +[no]cl
              This option displays [or does not display] the CLASS when print-
              ing the record.

       +[no]comments
              This  option toggles the display of comment lines in the output.
              The default is to print comments.

       +[no]continue
              This option toggles continuation on errors (e.g. timeouts).

       +[no]crypto
              This option toggles  the  display  of  cryptographic  fields  in
              DNSSEC  records. The contents of these fields are unnecessary to
              debug most DNSSEC validation failures and removing them makes it
              easier to see the common failures. The default is to display the
              fields. When omitted, they are replaced by  the  string  "[omit-
              ted]";  in  the  DNSKEY case, the key ID is displayed as the re-
              placement, e.g., [ key id = value ].

       +dscp[=value]
              This option sets the DSCP code point to be used when sending the
              query.  Valid DSCP code points are in the range [0...63]. By de-
              fault no code point is explicitly set.

       +[no]multiline
              This option toggles printing of records, like the  SOA  records,
              in a verbose multi-line format with human-readable comments. The
              default is to print each record on a single line, to  facilitate
              machine parsing of the mdig output.

       +[no]question
              This option prints [or does not print] the question section of a
              query when an answer is returned. The default is  to  print  the
              question section as a comment.

       +[no]rrcomments
              This  option  toggles  the display of per-record comments in the
              output (for example, human-readable key information about DNSKEY
              records).  The  default  is  not to print record comments unless
              multiline mode is active.

       +[no]short
              This option provides [or does not provide] a terse  answer.  The
              default is to print the answer in a verbose form.

       +split=W
              This  option  splits long hex- or base64-formatted fields in re-
              source records into chunks of W characters (where W  is  rounded
              up  to  the  nearest multiple of 4). +nosplit or +split=0 causes
              fields not to be split. The default  is  56  characters,  or  44
              characters when multiline mode is active.

       +[no]tcp
              This  option  uses  [or  does  not  use]  TCP when querying name
              servers. The default behavior is to use UDP.

       +[no]ttlid
              This option displays [or does not display] the TTL when printing
              the record.

       +[no]ttlunits
              This  option  displays [or does not display] the TTL in friendly
              human-readable time units of "s", "m", "h", "d", and "w", repre-
              senting  seconds,  minutes, hours, days, and weeks. This implies
              +ttlid.

       +[no]vc
              This option uses [or  does  not  use]  TCP  when  querying  name
              servers. This alternate syntax to +[no]tcp is provided for back-
              wards compatibility. The vc stands for "virtual circuit".

LOCAL OPTIONS
       -c class
              This option sets the query class to class. It can be  any  valid
              query  class  which  is  supported  in BIND 9. The default query
              class is "IN".

       -t type
              This option sets the query type to type. It  can  be  any  valid
              query  type which is supported in BIND 9. The default query type
              is "A", unless the -x option is supplied to indicate  a  reverse
              lookup with the "PTR" query type.

       -x addr
              Reverse lookups - mapping addresses to names - are simplified by
              this option. addr is an IPv4 address in dotted-decimal notation,
              or a colon-delimited IPv6 address. mdig automatically performs a
              lookup for a query name like 11.12.13.10.in-addr.arpa  and  sets
              the query type and class to PTR and IN respectively. By default,
              IPv6 addresses are looked  up  using  nibble  format  under  the
              IP6.ARPA domain.

       The local query options are:

       +[no]aaflag
              This is a synonym for +[no]aaonly.

       +[no]aaonly
              This sets the aa flag in the query.

       +[no]adflag
              This  sets  [or does not set] the AD (authentic data) bit in the
              query. This requests the server to return whether all of the an-
              swer  and  authority sections have all been validated as secure,
              according to the security policy of the server.  AD=1  indicates
              that all records have been validated as secure and the answer is
              not from a OPT-OUT range. AD=0 indicates that some part  of  the
              answer  was  insecure  or not validated.  This bit is set by de-
              fault.

       +bufsize=B
              This sets the UDP message buffer size advertised using EDNS0  to
              B  bytes. The maximum and minimum sizes of this buffer are 65535
              and 0 respectively. Values outside this range are rounded up  or
              down appropriately. Values other than zero cause a EDNS query to
              be sent.

       +[no]cdflag
              This sets [or does not set] the CD (checking  disabled)  bit  in
              the  query. This requests the server to not perform DNSSEC vali-
              dation of responses.

       +[no]cookie=####
              This sends [or does not send] a COOKIE EDNS option, with an  op-
              tional value. Replaying a COOKIE from a previous response allows
              the server to identify a previous client. The  default  is  +no-
              cookie.

       +[no]dnssec
              This  requests that DNSSEC records be sent by setting the DNSSEC
              OK (DO) bit in the OPT record in the additional section  of  the
              query.

       +[no]edns[=#]
              This  specifies  [or does not specify] the EDNS version to query
              with. Valid values are 0  to  255.   Setting  the  EDNS  version
              causes  an EDNS query to be sent.  +noedns clears the remembered
              EDNS version. EDNS is set to 0 by default.

       +[no]ednsflags[=#]
              This sets the must-be-zero EDNS flag bits (Z bits) to the speci-
              fied  value.   Decimal,  hex,  and octal encodings are accepted.
              Setting a named flag (e.g. DO) is silently ignored. By  default,
              no Z bits are set.

       +[no]ednsopt[=code[:value]]
              This  specifies  [or  does not specify] an EDNS option with code
              point code and an optional payload of  value  as  a  hexadecimal
              string. +noednsopt clears the EDNS options to be sent.

       +[no]expire
              This toggles sending of an EDNS Expire option.

       +[no]nsid
              This  toggles  inclusion  of an EDNS name server ID request when
              sending a query.

       +[no]recurse
              This toggles the setting of the RD (recursion  desired)  bit  in
              the  query.   This  bit is set by default, which means mdig nor-
              mally sends recursive queries.

       +retry=T
              This sets the number of times to retry UDP queries to server  to
              T  instead  of  the default, 2. Unlike +tries, this does not in-
              clude the initial query.

       +[no]subnet=addr[/prefix-length]
              This sends [or does not send] an EDNS Client Subnet option  with
              the specified IP address or network prefix.

       mdig +subnet=0.0.0.0/0, or simply mdig +subnet=0
              This  sends  an  EDNS client-subnet option with an empty address
              and a source prefix-length of zero,  which  signals  a  resolver
              that  the client's address information must not be used when re-
              solving this query.

       +timeout=T
              This sets the timeout for a query  to  T  seconds.  The  default
              timeout  is  5  seconds for UDP transport and 10 for TCP. An at-
              tempt to set T to less than 1 results in a query  timeout  of  1
              second being applied.

       +tries=T
              This  sets the number of times to try UDP queries to server to T
              instead of the default, 3. If T is less than or equal  to  zero,
              the number of tries is silently rounded up to 1.

       +udptimeout=T
              This sets the timeout between UDP query retries to T.

       +[no]unknownformat
              This  prints  [or  does  not print] all RDATA in unknown RR-type
              presentation format (see RFC 3597).  The  default  is  to  print
              RDATA for known types in the type's presentation format.

       +[no]yaml
              This  toggles  printing of the responses in a detailed YAML for-
              mat.

       +[no]zflag
              This sets [or does not set] the last unassigned DNS header  flag
              in a DNS query.  This flag is off by default.

SEE ALSO
       dig(1), RFC 1035.

AUTHOR
       Internet Systems Consortium

COPYRIGHT
       2022, Internet Systems Consortium

9.18.1-1ubuntu1.2-Ubuntu          2022-03-07                           MDIG(1)
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