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<!--
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- Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
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- Copyright (C) 2000-2003 Internet Software Consortium.
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- Permission to use, copy, modify, and distribute this software for any
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- purpose with or without fee is hereby granted, provided that the above
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- copyright notice and this permission notice appear in all copies.
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-
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- THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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- AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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-->
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<!-- Id: dig.html,v 1.41.150.2 2008/05/15 01:42:11 tbox Exp -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>dig</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
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<a name="man.dig"></a><div class="titlepage"></div>
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<div class="refnamediv">
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<h2>Name</h2>
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<p>dig — DNS lookup utility</p>
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</div>
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<div class="refsynopsisdiv">
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<h2>Synopsis</h2>
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<div class="cmdsynopsis"><p><code class="command">dig</code> [@server] [<code class="option">-b <em class="replaceable"><code>address</code></em></code>] [<code class="option">-c <em class="replaceable"><code>class</code></em></code>] [<code class="option">-f <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-k <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-p <em class="replaceable"><code>port#</code></em></code>] [<code class="option">-q <em class="replaceable"><code>name</code></em></code>] [<code class="option">-t <em class="replaceable"><code>type</code></em></code>] [<code class="option">-x <em class="replaceable"><code>addr</code></em></code>] [<code class="option">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]name:key</code></em></code>] [<code class="option">-4</code>] [<code class="option">-6</code>] [name] [type] [class] [queryopt...]</p></div>
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<div class="cmdsynopsis"><p><code class="command">dig</code> [<code class="option">-h</code>]</p></div>
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<div class="cmdsynopsis"><p><code class="command">dig</code> [global-queryopt...] [query...]</p></div>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543511"></a><h2>DESCRIPTION</h2>
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<p><span><strong class="command">dig</strong></span>
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(domain information groper) is a flexible tool
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for interrogating DNS name servers. It performs DNS lookups and
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displays the answers that are returned from the name server(s) that
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were queried. Most DNS administrators use <span><strong class="command">dig</strong></span> to
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troubleshoot DNS problems because of its flexibility, ease of use and
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clarity of output. Other lookup tools tend to have less functionality
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than <span><strong class="command">dig</strong></span>.
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</p>
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<p>
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Although <span><strong class="command">dig</strong></span> is normally used with
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command-line
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arguments, it also has a batch mode of operation for reading lookup
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requests from a file. A brief summary of its command-line arguments
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and options is printed when the <code class="option">-h</code> option is given.
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Unlike earlier versions, the BIND 9 implementation of
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<span><strong class="command">dig</strong></span> allows multiple lookups to be issued
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from the
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command line.
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</p>
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<p>
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Unless it is told to query a specific name server,
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<span><strong class="command">dig</strong></span> will try each of the servers listed
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in
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<code class="filename">/etc/resolv.conf</code>.
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</p>
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<p>
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When no command line arguments or options are given, will perform an
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NS query for "." (the root).
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</p>
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<p>
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It is possible to set per-user defaults for <span><strong class="command">dig</strong></span> via
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<code class="filename">${HOME}/.digrc</code>. This file is read and
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any options in it
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are applied before the command line arguments.
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</p>
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<p>
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The IN and CH class names overlap with the IN and CH top level
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domains names. Either use the <code class="option">-t</code> and
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<code class="option">-c</code> options to specify the type and class or
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use the <code class="option">-q</code> the specify the domain name or
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use "IN." and "CH." when looking up these top level domains.
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543580"></a><h2>SIMPLE USAGE</h2>
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<p>
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A typical invocation of <span><strong class="command">dig</strong></span> looks like:
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</p>
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<pre class="programlisting"> dig @server name type </pre>
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<p>
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where:
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</p>
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<div class="variablelist"><dl>
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<dt><span class="term"><code class="constant">server</code></span></dt>
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<dd><p>
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is the name or IP address of the name server to query. This can
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be an IPv4
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address in dotted-decimal notation or an IPv6
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address in colon-delimited notation. When the supplied
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<em class="parameter"><code>server</code></em> argument is a
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hostname,
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<span><strong class="command">dig</strong></span> resolves that name before
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querying that name
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server. If no <em class="parameter"><code>server</code></em>
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argument is provided,
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<span><strong class="command">dig</strong></span> consults <code class="filename">/etc/resolv.conf</code>
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and queries the name servers listed there. The reply from the
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name
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server that responds is displayed.
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</p></dd>
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<dt><span class="term"><code class="constant">name</code></span></dt>
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<dd><p>
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is the name of the resource record that is to be looked up.
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</p></dd>
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<dt><span class="term"><code class="constant">type</code></span></dt>
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<dd><p>
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indicates what type of query is required —
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ANY, A, MX, SIG, etc.
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<em class="parameter"><code>type</code></em> can be any valid query
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type. If no
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<em class="parameter"><code>type</code></em> argument is supplied,
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<span><strong class="command">dig</strong></span> will perform a lookup for an
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A record.
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</p></dd>
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</dl></div>
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<p>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543671"></a><h2>OPTIONS</h2>
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<p>
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The <code class="option">-b</code> option sets the source IP address of the query
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to <em class="parameter"><code>address</code></em>. This must be a valid
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address on
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one of the host's network interfaces or "0.0.0.0" or "::". An optional
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port
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may be specified by appending "#<port>"
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</p>
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<p>
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The default query class (IN for internet) is overridden by the
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<code class="option">-c</code> option. <em class="parameter"><code>class</code></em> is
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any valid
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class, such as HS for Hesiod records or CH for Chaosnet records.
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</p>
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<p>
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The <code class="option">-f</code> option makes <span><strong class="command">dig </strong></span>
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operate
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in batch mode by reading a list of lookup requests to process from the
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file <em class="parameter"><code>filename</code></em>. The file contains a
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number of
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queries, one per line. Each entry in the file should be organized in
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the same way they would be presented as queries to
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<span><strong class="command">dig</strong></span> using the command-line interface.
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</p>
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<p>
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If a non-standard port number is to be queried, the
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<code class="option">-p</code> option is used. <em class="parameter"><code>port#</code></em> is
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the port number that <span><strong class="command">dig</strong></span> will send its
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queries
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instead of the standard DNS port number 53. This option would be used
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to test a name server that has been configured to listen for queries
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on a non-standard port number.
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</p>
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<p>
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The <code class="option">-4</code> option forces <span><strong class="command">dig</strong></span>
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to only
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use IPv4 query transport. The <code class="option">-6</code> option forces
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<span><strong class="command">dig</strong></span> to only use IPv6 query transport.
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</p>
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<p>
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The <code class="option">-t</code> option sets the query type to
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<em class="parameter"><code>type</code></em>. It can be any valid query type
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which is
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supported in BIND 9. The default query type is "A", unless the
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<code class="option">-x</code> option is supplied to indicate a reverse lookup.
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A zone transfer can be requested by specifying a type of AXFR. When
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an incremental zone transfer (IXFR) is required,
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<em class="parameter"><code>type</code></em> is set to <code class="literal">ixfr=N</code>.
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The incremental zone transfer will contain the changes made to the zone
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since the serial number in the zone's SOA record was
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<em class="parameter"><code>N</code></em>.
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</p>
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<p>
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The <code class="option">-q</code> option sets the query name to
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<em class="parameter"><code>name</code></em>. This useful do distinguish the
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<em class="parameter"><code>name</code></em> from other arguments.
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</p>
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<p>
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Reverse lookups — mapping addresses to names — are simplified by the
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<code class="option">-x</code> option. <em class="parameter"><code>addr</code></em> is
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an IPv4
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address in dotted-decimal notation, or a colon-delimited IPv6 address.
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When this option is used, there is no need to provide the
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<em class="parameter"><code>name</code></em>, <em class="parameter"><code>class</code></em> and
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<em class="parameter"><code>type</code></em> arguments. <span><strong class="command">dig</strong></span>
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automatically performs a lookup for a name like
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<code class="literal">11.12.13.10.in-addr.arpa</code> and sets the
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query type and
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class to PTR and IN respectively. By default, IPv6 addresses are
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looked up using nibble format under the IP6.ARPA domain.
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To use the older RFC1886 method using the IP6.INT domain
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specify the <code class="option">-i</code> option. Bit string labels (RFC2874)
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are now experimental and are not attempted.
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</p>
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<p>
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To sign the DNS queries sent by <span><strong class="command">dig</strong></span> and
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their
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responses using transaction signatures (TSIG), specify a TSIG key file
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using the <code class="option">-k</code> option. You can also specify the TSIG
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key itself on the command line using the <code class="option">-y</code> option;
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<em class="parameter"><code>hmac</code></em> is the type of the TSIG, default HMAC-MD5,
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<em class="parameter"><code>name</code></em> is the name of the TSIG key and
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<em class="parameter"><code>key</code></em> is the actual key. The key is a
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base-64
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encoded string, typically generated by
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<span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>.
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2007-01-28 00:02:43 +03:00
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Caution should be taken when using the <code class="option">-y</code> option on
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multi-user systems as the key can be visible in the output from
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<span class="citerefentry"><span class="refentrytitle">ps</span>(1)</span>
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or in the shell's history file. When
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using TSIG authentication with <span><strong class="command">dig</strong></span>, the name
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server that is queried needs to know the key and algorithm that is
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being used. In BIND, this is done by providing appropriate
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<span><strong class="command">key</strong></span> and <span><strong class="command">server</strong></span> statements in
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<code class="filename">named.conf</code>.
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</p>
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</div>
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|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2543942"></a><h2>QUERY OPTIONS</h2>
|
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|
|
|
<p><span><strong class="command">dig</strong></span>
|
|
|
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provides a number of query options which affect
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the way in which lookups are made and the results displayed. Some of
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these set or reset flag bits in the query header, some determine which
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sections of the answer get printed, and others determine the timeout
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and retry strategies.
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|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Each query option is identified by a keyword preceded by a plus sign
|
|
|
|
|
(<code class="literal">+</code>). Some keywords set or reset an
|
|
|
|
|
option. These may be preceded
|
|
|
|
|
by the string <code class="literal">no</code> to negate the meaning of
|
|
|
|
|
that keyword. Other
|
|
|
|
|
keywords assign values to options like the timeout interval. They
|
|
|
|
|
have the form <code class="option">+keyword=value</code>.
|
|
|
|
|
The query options are:
|
2004-05-18 03:43:04 +04:00
|
|
|
|
2007-01-28 00:02:43 +03:00
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<div class="variablelist"><dl>
|
|
|
|
|
<dt><span class="term"><code class="option">+[no]tcp</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Use [do not use] TCP when querying name servers. The default
|
2008-06-21 22:25:42 +04:00
|
|
|
behavior is to use UDP unless an AXFR or IXFR query is
|
2007-01-28 00:02:43 +03:00
|
|
|
requested, in
|
|
|
|
|
which case a TCP connection is used.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]vc</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Use [do not use] TCP when querying name servers. This alternate
|
|
|
|
|
syntax to <em class="parameter"><code>+[no]tcp</code></em> is
|
|
|
|
|
provided for backwards
|
|
|
|
|
compatibility. The "vc" stands for "virtual circuit".
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]ignore</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Ignore truncation in UDP responses instead of retrying with TCP.
|
|
|
|
|
By
|
|
|
|
|
default, TCP retries are performed.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+domain=somename</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set the search list to contain the single domain
|
|
|
|
|
<em class="parameter"><code>somename</code></em>, as if specified in
|
|
|
|
|
a
|
|
|
|
|
<span><strong class="command">domain</strong></span> directive in
|
|
|
|
|
<code class="filename">/etc/resolv.conf</code>, and enable
|
|
|
|
|
search list
|
|
|
|
|
processing as if the <em class="parameter"><code>+search</code></em>
|
|
|
|
|
option were given.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]search</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Use [do not use] the search list defined by the searchlist or
|
|
|
|
|
domain
|
|
|
|
|
directive in <code class="filename">resolv.conf</code> (if
|
|
|
|
|
any).
|
|
|
|
|
The search list is not used by default.
|
|
|
|
|
</p></dd>
|
|
|
|
|
<dt><span class="term"><code class="option">+[no]showsearch</code></span></dt>
|
|
|
|
|
<dd><p>
|
|
|
|
|
Perform [do not perform] a search showing intermediate
|
|
|
|
|
results.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]defname</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Deprecated, treated as a synonym for <em class="parameter"><code>+[no]search</code></em>
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]aaonly</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Sets the "aa" flag in the query.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]aaflag</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
A synonym for <em class="parameter"><code>+[no]aaonly</code></em>.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]adflag</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set [do not set] the AD (authentic data) bit in the query. The
|
|
|
|
|
AD bit
|
|
|
|
|
currently has a standard meaning only in responses, not in
|
|
|
|
|
queries,
|
|
|
|
|
but the ability to set the bit in the query is provided for
|
|
|
|
|
completeness.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]cdflag</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set [do not set] the CD (checking disabled) bit in the query.
|
|
|
|
|
This
|
|
|
|
|
requests the server to not perform DNSSEC validation of
|
|
|
|
|
responses.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]cl</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Display [do not display] the CLASS when printing the record.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]ttlid</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Display [do not display] the TTL when printing the record.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]recurse</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Toggle the setting of the RD (recursion desired) bit in the
|
|
|
|
|
query.
|
|
|
|
|
This bit is set by default, which means <span><strong class="command">dig</strong></span>
|
|
|
|
|
normally sends recursive queries. Recursion is automatically
|
|
|
|
|
disabled
|
|
|
|
|
when the <em class="parameter"><code>+nssearch</code></em> or
|
|
|
|
|
<em class="parameter"><code>+trace</code></em> query options are
|
|
|
|
|
used.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]nssearch</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
When this option is set, <span><strong class="command">dig</strong></span>
|
|
|
|
|
attempts to find the
|
|
|
|
|
authoritative name servers for the zone containing the name
|
|
|
|
|
being
|
|
|
|
|
looked up and display the SOA record that each name server has
|
|
|
|
|
for the
|
|
|
|
|
zone.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]trace</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Toggle tracing of the delegation path from the root name servers
|
|
|
|
|
for
|
|
|
|
|
the name being looked up. Tracing is disabled by default. When
|
|
|
|
|
tracing is enabled, <span><strong class="command">dig</strong></span> makes
|
|
|
|
|
iterative queries to
|
|
|
|
|
resolve the name being looked up. It will follow referrals from
|
|
|
|
|
the
|
|
|
|
|
root servers, showing the answer from each server that was used
|
|
|
|
|
to
|
|
|
|
|
resolve the lookup.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]cmd</code></span></dt>
|
|
|
|
|
<dd><p>
|
2008-06-21 22:25:42 +04:00
|
|
|
Toggles the printing of the initial comment in the output
|
2007-01-28 00:02:43 +03:00
|
|
|
identifying
|
|
|
|
|
the version of <span><strong class="command">dig</strong></span> and the query
|
|
|
|
|
options that have
|
|
|
|
|
been applied. This comment is printed by default.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]short</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Provide a terse answer. The default is to print the answer in a
|
|
|
|
|
verbose form.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]identify</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Show [or do not show] the IP address and port number that
|
|
|
|
|
supplied the
|
|
|
|
|
answer when the <em class="parameter"><code>+short</code></em> option
|
|
|
|
|
is enabled. If
|
|
|
|
|
short form answers are requested, the default is not to show the
|
|
|
|
|
source address and port number of the server that provided the
|
|
|
|
|
answer.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]comments</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Toggle the display of comment lines in the output. The default
|
|
|
|
|
is to
|
|
|
|
|
print comments.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]stats</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
This query option toggles the printing of statistics: when the
|
|
|
|
|
query
|
|
|
|
|
was made, the size of the reply and so on. The default
|
2008-06-21 22:25:42 +04:00
|
|
|
behavior is
|
2007-01-28 00:02:43 +03:00
|
|
|
to print the query statistics.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]qr</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Print [do not print] the query as it is sent.
|
|
|
|
|
By default, the query is not printed.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]question</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
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.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]answer</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Display [do not display] the answer section of a reply. The
|
|
|
|
|
default
|
|
|
|
|
is to display it.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]authority</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Display [do not display] the authority section of a reply. The
|
|
|
|
|
default is to display it.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]additional</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Display [do not display] the additional section of a reply.
|
|
|
|
|
The default is to display it.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]all</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set or clear all display flags.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+time=T</code></span></dt>
|
|
|
|
|
<dd><p>
|
|
|
|
|
|
2007-01-28 00:02:43 +03:00
|
|
|
Sets the timeout for a query to
|
2008-06-21 22:25:42 +04:00
|
|
|
<em class="parameter"><code>T</code></em> seconds. The default
|
|
|
|
|
timeout is 5 seconds.
|
2007-01-28 00:02:43 +03:00
|
|
|
An attempt to set <em class="parameter"><code>T</code></em> to less
|
|
|
|
|
than 1 will result
|
|
|
|
|
in a query timeout of 1 second being applied.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+tries=T</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Sets the number of times to try UDP queries to server to
|
|
|
|
|
<em class="parameter"><code>T</code></em> instead of the default, 3.
|
|
|
|
|
If
|
|
|
|
|
<em class="parameter"><code>T</code></em> is less than or equal to
|
|
|
|
|
zero, the number of
|
|
|
|
|
tries is silently rounded up to 1.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+retry=T</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Sets the number of times to retry UDP queries to server to
|
|
|
|
|
<em class="parameter"><code>T</code></em> instead of the default, 2.
|
|
|
|
|
Unlike
|
|
|
|
|
<em class="parameter"><code>+tries</code></em>, this does not include
|
|
|
|
|
the initial
|
|
|
|
|
query.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+ndots=D</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set the number of dots that have to appear in
|
|
|
|
|
<em class="parameter"><code>name</code></em> to <em class="parameter"><code>D</code></em> for it to be
|
|
|
|
|
considered absolute. The default value is that defined using
|
|
|
|
|
the
|
|
|
|
|
ndots statement in <code class="filename">/etc/resolv.conf</code>, or 1 if no
|
|
|
|
|
ndots statement is present. Names with fewer dots are
|
|
|
|
|
interpreted as
|
|
|
|
|
relative names and will be searched for in the domains listed in
|
|
|
|
|
the
|
|
|
|
|
<code class="option">search</code> or <code class="option">domain</code> directive in
|
|
|
|
|
<code class="filename">/etc/resolv.conf</code>.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+bufsize=B</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Set the UDP message buffer size advertised using EDNS0 to
|
|
|
|
|
<em class="parameter"><code>B</code></em> 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.
|
|
|
|
|
</p></dd>
|
|
|
|
|
<dt><span class="term"><code class="option">+edns=#</code></span></dt>
|
|
|
|
|
<dd><p>
|
|
|
|
|
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. <code class="option">+noedns</code> clears the
|
|
|
|
|
remembered EDNS version.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]multiline</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
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 <span><strong class="command">dig</strong></span> output.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]fail</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Do not try the next server if you receive a SERVFAIL. The
|
|
|
|
|
default is
|
|
|
|
|
to not try the next server which is the reverse of normal stub
|
|
|
|
|
resolver
|
2008-06-21 22:25:42 +04:00
|
|
|
behavior.
|
2007-01-28 00:02:43 +03:00
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]besteffort</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Attempt to display the contents of messages which are malformed.
|
|
|
|
|
The default is to not display malformed answers.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]dnssec</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Requests DNSSEC records be sent by setting the DNSSEC OK bit
|
|
|
|
|
(DO)
|
|
|
|
|
in the OPT record in the additional section of the query.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+[no]sigchase</code></span></dt>
|
|
|
|
|
<dd><p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Chase DNSSEC signature chains. Requires dig be compiled with
|
|
|
|
|
-DDIG_SIGCHASE.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
<dt><span class="term"><code class="option">+trusted-key=####</code></span></dt>
|
|
|
|
|
<dd>
|
|
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Specifies a file containing trusted keys to be used with
|
2005-12-22 02:06:48 +03:00
|
|
|
<code class="option">+sigchase</code>. Each DNSKEY record must be
|
|
|
|
|
on its own line.
|
2007-01-28 00:02:43 +03:00
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
|
|
|
|
If not specified <span><strong class="command">dig</strong></span> will look for
|
|
|
|
|
<code class="filename">/etc/trusted-key.key</code> then
|
|
|
|
|
<code class="filename">trusted-key.key</code> in the current directory.
|
|
|
|
|
</p>
|
|
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
Requires dig be compiled with -DDIG_SIGCHASE.
|
2005-12-22 02:06:48 +03:00
|
|
|
</p>
|
|
|
|
|
</dd>
|
|
|
|
|
<dt><span class="term"><code class="option">+[no]topdown</code></span></dt>
|
|
|
|
|
<dd><p>
|
2008-06-21 22:25:42 +04:00
|
|
|
When chasing DNSSEC signature chains perform a top-down
|
2007-01-28 00:02:43 +03:00
|
|
|
validation.
|
|
|
|
|
Requires dig be compiled with -DDIG_SIGCHASE.
|
|
|
|
|
</p></dd>
|
2008-06-21 22:25:42 +04:00
|
|
|
<dt><span class="term"><code class="option">+[no]nsid</code></span></dt>
|
|
|
|
|
<dd><p>
|
|
|
|
|
Include an EDNS name server ID request when sending a query.
|
|
|
|
|
</p></dd>
|
2005-12-22 02:06:48 +03:00
|
|
|
</dl></div>
|
|
|
|
|
<p>
|
|
|
|
|
|
2007-01-28 00:02:43 +03:00
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
</div>
|
|
|
|
|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2545145"></a><h2>MULTIPLE QUERIES</h2>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
The BIND 9 implementation of <span><strong class="command">dig </strong></span>
|
|
|
|
|
supports
|
|
|
|
|
specifying multiple queries on the command line (in addition to
|
|
|
|
|
supporting the <code class="option">-f</code> batch file option). Each of those
|
|
|
|
|
queries can be supplied with its own set of flags, options and query
|
|
|
|
|
options.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
In this case, each <em class="parameter"><code>query</code></em> argument
|
|
|
|
|
represent an
|
|
|
|
|
individual query in the command-line syntax described above. Each
|
|
|
|
|
consists of any of the standard options and flags, the name to be
|
|
|
|
|
looked up, an optional query type and class and any query options that
|
|
|
|
|
should be applied to that query.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
A global set of query options, which should be applied to all queries,
|
|
|
|
|
can also be supplied. These global query options must precede the
|
|
|
|
|
first tuple of name, class, type, options, flags, and query options
|
|
|
|
|
supplied on the command line. Any global query options (except
|
|
|
|
|
the <code class="option">+[no]cmd</code> option) can be
|
|
|
|
|
overridden by a query-specific set of query options. For example:
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
<pre class="programlisting">
|
|
|
|
|
dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
|
|
|
|
|
</pre>
|
|
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
shows how <span><strong class="command">dig</strong></span> could be used from the
|
|
|
|
|
command line
|
|
|
|
|
to make three lookups: an ANY query for <code class="literal">www.isc.org</code>, a
|
|
|
|
|
reverse lookup of 127.0.0.1 and a query for the NS records of
|
|
|
|
|
<code class="literal">isc.org</code>.
|
2004-05-18 03:43:04 +04:00
|
|
|
|
2007-01-28 00:02:43 +03:00
|
|
|
A global query option of <em class="parameter"><code>+qr</code></em> is
|
|
|
|
|
applied, so
|
|
|
|
|
that <span><strong class="command">dig</strong></span> shows the initial query it made
|
|
|
|
|
for each
|
|
|
|
|
lookup. The final query has a local query option of
|
|
|
|
|
<em class="parameter"><code>+noqr</code></em> which means that <span><strong class="command">dig</strong></span>
|
|
|
|
|
will not print the initial query when it looks up the NS records for
|
|
|
|
|
<code class="literal">isc.org</code>.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
</div>
|
|
|
|
|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2545275"></a><h2>IDN SUPPORT</h2>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
If <span><strong class="command">dig</strong></span> has been built with IDN (internationalized
|
|
|
|
|
domain name) support, it can accept and display non-ASCII domain names.
|
|
|
|
|
<span><strong class="command">dig</strong></span> appropriately converts character encoding of
|
|
|
|
|
domain name before sending a request to DNS server or displaying a
|
|
|
|
|
reply from the server.
|
|
|
|
|
If you'd like to turn off the IDN support for some reason, defines
|
|
|
|
|
the <code class="envar">IDN_DISABLE</code> environment variable.
|
|
|
|
|
The IDN support is disabled if the variable is set when
|
|
|
|
|
<span><strong class="command">dig</strong></span> runs.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
</div>
|
|
|
|
|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2545298"></a><h2>FILES</h2>
|
2007-01-28 00:02:43 +03:00
|
|
|
<p><code class="filename">/etc/resolv.conf</code>
|
|
|
|
|
</p>
|
|
|
|
|
<p><code class="filename">${HOME}/.digrc</code>
|
|
|
|
|
</p>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2545315"></a><h2>SEE ALSO</h2>
|
2007-01-28 00:02:43 +03:00
|
|
|
<p><span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>,
|
|
|
|
|
<span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>,
|
|
|
|
|
<span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>,
|
|
|
|
|
<em class="citetitle">RFC1035</em>.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
</div>
|
|
|
|
|
<div class="refsect1" lang="en">
|
2008-06-21 22:25:42 +04:00
|
|
|
<a name="id2545352"></a><h2>BUGS</h2>
|
2005-12-22 02:06:48 +03:00
|
|
|
<p>
|
2007-01-28 00:02:43 +03:00
|
|
|
There are probably too many query options.
|
|
|
|
|
</p>
|
2005-12-22 02:06:48 +03:00
|
|
|
</div>
|
|
|
|
|
</div></body>
|
|
|
|
|
</html>
|
