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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
       address] [-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
       received, 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
       retrieved  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
       resolves 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
       answer  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
              replacement, 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
              default 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
              resource 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
              answer 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
              default.

       +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
              optional value. Replaying a  COOKIE  from  a  previous  response
              allows  the server to identify a previous client. The default is
              +nocookie.

       +[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
              include 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
              resolving 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
              attempt  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

       2020, Internet Systems Consortium



9.16.12                           2021-02-04                           mdig(1)

bind 9.16.12 - Generated Sat Feb 20 08:41:26 CST 2021
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