1633838b8255282d10af15c5c84cee5a51466712Bob Halley<!DOCTYPE book [

69fe9aaafdd6a141610e86a777d325db75422070Mark Andrews<!ENTITY mdash "&#8212;">]>

dafcb997e390efa4423883dafd100c975c4095d6Mark Andrews

dafcb997e390efa4423883dafd100c975c4095d6Mark Andrews<refentry xmlns:db="http://docbook.org/ns/docbook" version="5.0" xml:id="man.mdig">

dafcb997e390efa4423883dafd100c975c4095d6Mark Andrews <info>

dafcb997e390efa4423883dafd100c975c4095d6Mark Andrews <date>2015-01-05</date>

dafcb997e390efa4423883dafd100c975c4095d6Mark Andrews </info>

1633838b8255282d10af15c5c84cee5a51466712Bob Halley <refentryinfo>

9a4ce0c25809073f31226faa6ed94c70474cf363Bob Halley <corpname>ISC</corpname>

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews <corpauthor>Internet Systems Consortium, Inc.</corpauthor>

9c3531d72aeaad6c5f01efe6a1c82023e1379e4dDavid Lawrence </refentryinfo>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <refmeta>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <refentrytitle><application>mdig</application></refentrytitle>

9a4ce0c25809073f31226faa6ed94c70474cf363Bob Halley <manvolnum>1</manvolnum>

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein <refmiscinfo>BIND9</refmiscinfo>

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein </refmeta>

9a4ce0c25809073f31226faa6ed94c70474cf363Bob Halley <refnamediv>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <refname><application>mdig</application></refname>

9a4ce0c25809073f31226faa6ed94c70474cf363Bob Halley <refpurpose>DNS pipelined lookup utility</refpurpose>

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews </refnamediv>

9c4f33b6718407e94d50dbfb4977e16d3f83de9dDavid Lawrence

9c4f33b6718407e94d50dbfb4977e16d3f83de9dDavid Lawrence <docinfo>

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews <copyright>

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews <year>2015</year>

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein <year>2016</year>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <year>2017</year>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <holder>Internet Systems Consortium, Inc. ("ISC")</holder>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson </copyright>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson </docinfo>

d1dc805692ff816e28849396577affa9b4890e41Andreas Gustafsson

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <refsynopsisdiv>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <cmdsynopsis sepchar=" ">

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <command>mdig</command>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <arg choice="req" rep="norepeat">@server</arg>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <arg choice="opt" rep="norepeat"><option>-f <replaceable class="parameter">filename</replaceable></option></arg>

9afcd92352224325ed65919f69f7f58282fc6623Andreas Gustafsson <arg choice="opt" rep="norepeat"><option>-h</option></arg>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <arg choice="opt" rep="norepeat"><option>-v</option></arg>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <group choice="opt" rep="norepeat">

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein <arg choice="opt" rep="norepeat"><option>-4</option></arg>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat"><option>-6</option></arg>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington </group>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat"><option>-m</option></arg>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat"><option>-b <replaceable class="parameter">address</replaceable></option></arg>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat"><option>-p <replaceable class="parameter">port#</replaceable></option></arg>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat"><option>-c <replaceable class="parameter">class</replaceable></option></arg>

01956482905dd861a9b07d417d469955466b728dDamien Neil <arg choice="opt" rep="norepeat"><option>-t <replaceable class="parameter">type</replaceable></option></arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="opt" rep="norepeat"><option>-i</option></arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="opt" rep="norepeat"><option>-x <replaceable class="parameter">addr</replaceable></option></arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="opt" rep="repeat">plusopt</arg>

b2a6ebf1bd4dad1410afba9012a61d87090f03adDamien Neil </cmdsynopsis>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <cmdsynopsis sepchar=" ">

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein <command>mdig</command>

ab023a65562e62b85a824509d829b6fad87e00b1Rob Austein <arg choice="req" rep="norepeat">-h</arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil </cmdsynopsis>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <cmdsynopsis sepchar=" ">

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <command>mdig</command>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <arg choice="opt" rep="norepeat">@server</arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="req" rep="repeat">global-opt</arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="req" rep="repeat">

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="req" rep="repeat">local-opt</arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <arg choice="req" rep="norepeat">query</arg>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil </arg>

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff </cmdsynopsis>

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff </refsynopsisdiv>

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff <refsection><info><title>DESCRIPTION</title></info>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews <para><command>mdig</command>

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews is a multiple/pipelined query version of <command>dig</command>:

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil instead of waiting for a response after sending each query,

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff it begins by sending all queries. Responses are displayed in

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington the order in which they are received, not in the order the

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington corresponding queries were sent.

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington </para>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <para>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <command>mdig</command> options are a subset of the

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley <command>dig</command> options, and are divided into "anywhere

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley options" which can occur anywhere, "global options" which must

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington occur before the query name (or they are ignored with a warning),

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington and "local options" which apply to the next query on the command

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil line.

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil </para>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <para>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley The <arg choice="req" rep="norepeat">@server</arg> option is a mandatory global

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley option. It is the name or IP address of the name server to query.

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley (Unlike <command>dig</command>, this value is not retrieved from

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <filename>/etc/resolv.conf</filename>.) It can be an IPv4 address

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil in dotted-decimal notation, an IPv6 address in colon-delimited

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil notation, or a hostname. When the supplied

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <parameter>server</parameter> argument is a hostname,

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <command>mdig</command> resolves that name before querying

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil the name server.

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil </para>

f671a5c51cc59e266620c0c4026b054908fdd80cBob Halley

e4b9761b0ef03597c35d1ef1d86e12514c621f90Michael Graff <para><command>mdig</command>

f671a5c51cc59e266620c0c4026b054908fdd80cBob Halley provides a number of query options which affect

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil the way in which lookups are made and the results displayed. Some of

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil these set or reset flag bits in the query header, some determine which

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil sections of the answer get printed, and others determine the timeout

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil and retry strategies.

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil </para>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil <para>

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley Each query option is identified by a keyword preceded by a plus

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley sign (<literal>+</literal>). Some keywords set or reset an

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley option. These may be preceded by the string <literal>no</literal>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil to negate the meaning of that keyword. Other keywords assign

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley values to options like the timeout interval. They have the

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington form <option>+keyword=value</option>.

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington </para>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington </refsection>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <refsection><info><title>ANYWHERE OPTIONS</title></info>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <para>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington The <option>-f</option> option makes <command>mdig</command>

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil operate in batch mode by reading a list of lookup requests to

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil process from the file <parameter>filename</parameter>. The file

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil contains a number of queries, one per line. Each entry in the

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil file should be organized in the same way they would be presented

e9453d609db9aed9efd2bb4fd287ff3ad11da0b2Damien Neil as queries to <command>mdig</command> using the command-line interface.

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington </para>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <para>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington The <option>-h</option> causes <command>mdig</command> to

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff print the detailed help with the full list of options and exit.

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff </para>

8f7b56e275abdaaec08ccac32ffc6174841ae60eMichael Graff

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington <para>

26d20cd51c968e111b4122536825368a17b5ca82Brian Wellington The <option>-v</option> causes <command>mdig</command> to

18d0b5e54be891a1aa938c165b6d439859121ec8Mark Andrews print the version number and exit.

bf6d2e39124ab3d51c253f7acad9a4abef059be6Bob Halley </para>

</refsection>

<refsection><info><title>GLOBAL OPTIONS</title></info>

<para>

The <option>-4</option> option forces <command>mdig</command> to

only use IPv4 query transport.

</para>

<para>

The <option>-6</option> option forces <command>mdig</command> to

only use IPv6 query transport.

</para>

<para>

The <option>-b</option> option sets the source IP address of the

query to <parameter>address</parameter>. This must be a valid

address on one of the host's network interfaces or "0.0.0.0" or

"::". An optional port may be specified by appending

"#&lt;port&gt;"

</para>

<para>

The <option>-m</option> option enables memory usage debugging.

</para>

<para>

The <option>-p</option> option is used when a non-standard port

number is to be queried.

<parameter>port#</parameter> is the port number

that <command>mdig</command> will send its queries instead of

the standard DNS port number 53. This option would be used to

test a name server that has been configured to listen for

queries on a non-standard port number.

</para>

<para>

The global query options are:

<variablelist>

<varlistentry>

<term><option>+[no]additional</option></term>

<listitem>

<para>

Display [do not display] the additional section of a

reply. The default is to display it.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]all</option></term>

<listitem>

<para>

Set or clear all display flags.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]answer</option></term>

<listitem>

<para>

Display [do not display] the answer section of a

reply. The default is to display it.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]authority</option></term>

<listitem>

<para>

Display [do not display] the authority section of a

reply. The default is to display it.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]besteffort</option></term>

<listitem>

<para>

Attempt to display the contents of messages which are

malformed. The default is to not display malformed

answers.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]cl</option></term>

<listitem>

<para>

Display [do not display] the CLASS when printing the

record.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]comments</option></term>

<listitem>

<para>

Toggle the display of comment lines in the output.

The default is to print comments.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]continue</option></term>

<listitem>

<para>

Continue on errors (e.g. timeouts).

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]crypto</option></term>

<listitem>

<para>

Toggle the display of cryptographic fields in DNSSEC

records. The contents of these field 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 "[omitted]" or in the

DNSKEY case the key id is displayed as the replacement,

e.g. "[ key id = value ]".

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+dscp[=value]</option></term> <listitem>

<para>

Set 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.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]multiline</option></term>

<listitem>

<para>

Print 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 <command>mdig</command>

output.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]question</option></term>

<listitem>

<para>

Print [do not print] the question section of a query

when an answer is returned. The default is to print

the question section as a comment.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]rrcomments</option></term>

<listitem>

<para>

Toggle 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.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]short</option></term>

<listitem>

<para>

Provide a terse answer. The default is to print the

answer in a verbose form.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+split=W</option></term>

<listitem>

<para>

Split long hex- or base64-formatted fields in resource

records into chunks of <parameter>W</parameter>

characters (where <parameter>W</parameter> is rounded

up to the nearest multiple of 4).

<parameter>+nosplit</parameter> or

<parameter>+split=0</parameter> causes fields not to

be split at all. The default is 56 characters, or

44 characters when multiline mode is active.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]tcp</option></term>

<listitem>

<para>

Use [do not use] TCP when querying name servers. The

default behavior is to use UDP.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]ttlid</option></term>

<listitem>

<para>

Display [do not display] the TTL when printing the

record.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]ttlunits</option></term>

<listitem>

<para>

Display [do not display] the TTL in friendly human-readable

time units of "s", "m", "h", "d", and "w", representing

seconds, minutes, hours, days and weeks. Implies +ttlid.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]vc</option></term>

<listitem>

<para>

Use [do not use] TCP when querying name servers. This

alternate syntax to <parameter>+[no]tcp</parameter>

is provided for backwards compatibility. The "vc"

stands for "virtual circuit".

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsection>

<refsection><info><title>LOCAL OPTIONS</title></info>

<para>

The <option>-c</option> option sets the query class to

<parameter>class</parameter>. It can be any valid query class

which is supported in BIND 9. The default query class is "IN".

</para>

<para>

The <option>-t</option> option sets the query type to

<parameter>type</parameter>. It can be any valid query type

which is supported in BIND 9. The default query type is "A",

unless the <option>-x</option> option is supplied to indicate

a reverse lookup with the "PTR" query type.

</para>

<para>

The <option>-i</option> option sets the reverse domain for

IPv6 addresses to IP6.INT.

</para>

<para>

Reverse lookups &mdash; mapping addresses to names &mdash; are

simplified by the <option>-x</option> option.

<parameter>addr</parameter> is an IPv4

address in dotted-decimal notation, or a colon-delimited IPv6 address.

<command>mdig</command> automatically performs a lookup for a

query name like <literal>11.12.13.10.in-addr.arpa</literal> 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. To use the older RFC1886 method

using the IP6.INT domain specify the <option>-i</option> option.

</para>

<para>

The local query options are:

<variablelist>

<varlistentry>

<term><option>+[no]aaflag</option></term>

<listitem>

<para>

A synonym for <parameter>+[no]aaonly</parameter>.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]aaonly</option></term>

<listitem>

<para>

Sets the "aa" flag in the query.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]adflag</option></term>

<listitem>

<para>

Set [do 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 indicate that some part

of the answer was insecure or not validated. This

bit is set by default.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+bufsize=B</option></term>

<listitem>

<para>

Set the UDP message buffer size advertised using EDNS0

to <parameter>B</parameter> 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 will cause a

EDNS query to be sent.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]cdflag</option></term>

<listitem>

<para>

Set [do not set] the CD (checking disabled) bit in

the query. This requests the server to not perform

DNSSEC validation of responses.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]cookie<optional>=####</optional></option></term>

<listitem>

<para>

Send a COOKIE EDNS option, with optional value.

Replaying a COOKIE from a previous response will allow

the server to identify a previous client. The default

is <option>+nocookie</option>.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]dnssec</option></term>

<listitem>

<para>

Requests DNSSEC records be sent by setting the DNSSEC

OK bit (DO) in the OPT record in the additional section

of the query.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]edns[=#]</option></term>

<listitem>

<para>

Specify the EDNS version to query with. Valid values

are 0 to 255. Setting the EDNS version will cause

a EDNS query to be sent. <option>+noedns</option>

clears the remembered EDNS version. EDNS is set to

0 by default.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]ednsflags[=#]</option></term>

<listitem>

<para>

Set the must-be-zero EDNS flags bits (Z bits) to the

specified value. Decimal, hex and octal encodings are

accepted. Setting a named flag (e.g. DO) will silently be

ignored. By default, no Z bits are set.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]ednsopt[=code[:value]]</option></term>

<listitem>

<para>

Specify EDNS option with code point <option>code</option>

and optionally payload of <option>value</option> as a

hexadecimal string. <option>+noednsopt</option>

clears the EDNS options to be sent.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]expire</option></term>

<listitem>

<para>

Send an EDNS Expire option.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]nsid</option></term>

<listitem>

<para>

Include an EDNS name server ID request when sending

a query.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]recurse</option></term>

<listitem>

<para>

Toggle the setting of the RD (recursion desired) bit

in the query. This bit is set by default, which means

<command>mdig</command> normally sends recursive

queries.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+retry=T</option></term>

<listitem>

<para>

Sets the number of times to retry UDP queries to

server to <parameter>T</parameter> instead of the

default, 2. Unlike <parameter>+tries</parameter>,

this does not include the initial query.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]subnet=addr[/prefix-length]</option></term>

<listitem>

<para>

Send (don't send) an EDNS Client Subnet option with the

specified IP address or network prefix.

</para>

<para>

<command>mdig +subnet=0.0.0.0/0</command>, or simply

<command>mdig +subnet=0</command> for short, 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

<emphasis>not</emphasis> be used when resolving

this query.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+timeout=T</option></term>

<listitem>

<para>

Sets the timeout for a query to

<parameter>T</parameter> seconds. The default

timeout is 5 seconds for UDP transport and 10 for TCP.

An attempt to set <parameter>T</parameter> to less

than 1 will result

in a query timeout of 1 second being applied.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+tries=T</option></term>

<listitem>

<para>

Sets the number of times to try UDP queries to server

to <parameter>T</parameter> instead of the default,

3. If <parameter>T</parameter> is less than or equal

to zero, the number of tries is silently rounded up

to 1.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+udptimeout=T</option></term>

<listitem>

<para>

Sets the timeout between UDP query retries.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]unknownformat</option></term>

<listitem>

<para>

Print all RDATA in unknown RR type presentation format

(RFC 3597). The default is to print RDATA for known types

in the type's presentation format.

</para>

</listitem>

</varlistentry>

<varlistentry>

<term><option>+[no]zflag</option></term>

<listitem>

<para>

Set [do not set] the last unassigned DNS header flag in a

DNS query. This flag is off by default.

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsection>

<refsection><info><title>SEE ALSO</title></info>

<para><citerefentry>

<refentrytitle>dig</refentrytitle><manvolnum>1</manvolnum>

</citerefentry>,

<citetitle>RFC1035</citetitle>.

</para>

</refsection>

</refentry>