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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
- "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-<meta name="generator" content="HTML Tidy, see www.w3.org" />
-<title>DNS Tools</title>
-<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" />
-<link rel="HOME" title="Slackware Linux Essentials" href="index.html" />
-<link rel="UP" title="Basic Network Commands" href="basic-network-commands.html" />
-<link rel="PREVIOUS" title="traceroute" href="basic-network-commands-traceroute.html" />
-<link rel="NEXT" title="finger" href="basic-network-commands-finger.html" />
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-<body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"
-alink="#0000FF">
-<div class="NAVHEADER">
-<table summary="Header navigation table" width="100%" border="0" cellpadding="0"
-cellspacing="0">
-<tr>
-<th colspan="3" align="center">Slackware Linux Essentials</th>
-</tr>
-
-<tr>
-<td width="10%" align="left" valign="bottom"><a
-href="basic-network-commands-traceroute.html" accesskey="P">Prev</a></td>
-<td width="80%" align="center" valign="bottom">Chapter 13 Basic Network Commands</td>
-<td width="10%" align="right" valign="bottom"><a
-href="basic-network-commands-finger.html" accesskey="N">Next</a></td>
-</tr>
-</table>
-
-<hr align="LEFT" width="100%" />
-</div>
-
-<div class="SECT1">
-<h1 class="SECT1"><a id="BASIC-NETWORK-COMMANDS-DNS"
-name="BASIC-NETWORK-COMMANDS-DNS">13.3 DNS Tools</a></h1>
-
-<p>Domain Name Service (DNS for short) is that magical protocol that allows your computer
-to turn meaningless domain names like www.slackware.com into meaningful IP address like
-<tt class="HOSTID">64.57.102.34</tt>. Computers can't route packets to www.slackware.com,
-but they can route packets to that domain name's IP address. This gives us a convenient
-way to remember machines. Without DNS we'd have to keep a mental database of just what IP
-address belongs to what computer, and that's assuming the IP address doesn't change.
-Clearly using names for computers is better, but how do we map names to IP addresses?</p>
-
-<div class="SECT2">
-<h2 class="SECT2"><a id="AEN4475" name="AEN4475">13.3.1 <tt
-class="COMMAND">host</tt></a></h2>
-
-<p><tt class="COMMAND">host</tt>(1) can do this for us. <tt class="COMMAND">host</tt> is
-used to map names to IP addresses. It is a very quick and simple utility without a lot of
-functions.</p>
-
-<table border="0" bgcolor="#E0E0E0" width="100%">
-<tr>
-<td>
-<pre class="SCREEN">
-<samp class="PROMPT">%</samp> <kbd class="USERINPUT">host www.slackware.com</kbd>
-www.slackware.com is an alias for slackware.com.
-slackware.com has address 64.57.102.34
-</pre>
-</td>
-</tr>
-</table>
-
-<p>But let's say for some reason we want to map an IP address to a domain name; what
-then?</p>
-</div>
-
-<div class="SECT2">
-<h2 class="SECT2"><a id="AEN4487" name="AEN4487">13.3.2 <tt
-class="COMMAND">nslookup</tt></a></h2>
-
-<p><tt class="COMMAND">nslookup</tt> is a tried and true program that has weathered the
-ages. <tt class="COMMAND">nslookup</tt> has been deprecated and may be removed from
-future releases. There is not even a man page for this program.</p>
-
-<table border="0" bgcolor="#E0E0E0" width="100%">
-<tr>
-<td>
-<pre class="SCREEN">
-<samp class="PROMPT">%</samp> <kbd class="USERINPUT">nslookup 64.57.102.34</kbd>
-Note: nslookup is deprecated and may be removed from future releases.
-Consider using the `dig' or `host' programs instead. Run nslookup with
-the `-sil[ent]' option to prevent this message from appearing.
-Server: 192.168.1.254
-Address: 192.168.1.254#53
-
-Non-authoritative answer:
-www.slackware.com canonical name = slackware.com.
-Name: slackware.com
-Address: 64.57.102.34
-</pre>
-</td>
-</tr>
-</table>
-</div>
-
-<div class="SECT2">
-<h2 class="SECT2"><a id="AEN4496" name="AEN4496">13.3.3 <tt
-class="COMMAND">dig</tt></a></h2>
-
-<p>The meanest dog in the pound, the domain information groper, <tt
-class="COMMAND">dig</tt>(1) for short, is the go-to program for finding DNS information.
-<tt class="COMMAND">dig</tt> can grab just about anything from a DNS server including
-reverse lookups, A, CNAME, MX, SP, and TXT records. <tt class="COMMAND">dig</tt> has many
-command line options and if you're not familiar with it you should read through it's
-extensive man page.</p>
-
-<table border="0" bgcolor="#E0E0E0" width="100%">
-<tr>
-<td>
-<pre class="SCREEN">
-<samp class="PROMPT">%</samp> <kbd
-class="USERINPUT">dig @192.168.1.254 www.slackware.com mx</kbd>
-
-; &lt;&lt;&#62;&#62; DiG 9.2.2 &lt;&lt;&#62;&#62; @192.168.1.254 www.slackware.com mx
-;; global options: printcmd
-;; Got answer:
-;; -&#62;&#62;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 26362
-;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2
-
-;; QUESTION SECTION:
-;www.slackware.com. IN MX
-
-;; ANSWER SECTION:
-www.slackware.com. 76634 IN CNAME slackware.com.
-slackware.com. 86400 IN MX 1 mail.slackware.com.
-
-;; AUTHORITY SECTION:
-slackware.com. 86400 IN NS ns1.cwo.com.
-slackware.com. 86400 IN NS ns2.cwo.com.
-
-;; ADDITIONAL SECTION:
-ns1.cwo.com. 163033 IN A 64.57.100.2
-ns2.cwo.com. 163033 IN A 64.57.100.3
-
-;; Query time: 149 msec
-;; SERVER: 192.168.1.254#53(192.168.1.254)
-;; WHEN: Sat Nov 6 16:59:31 2004
-;; MSG SIZE rcvd: 159
-</pre>
-</td>
-</tr>
-</table>
-
-<p>This should give you an idea how <tt class="COMMAND">dig</tt> works.
-&#8220;@192.168.1.254&#8221; specifies the dns server to use.
-&#8220;www.slackware.com&#8221; is the domain name I am performing a lookup on, and
-&#8220;mx&#8221; is the type of lookup I am performing. The above query tells me that
-e-mail to <tt class="HOSTID">www.slackware.com</tt> will instead be sent to <tt
-class="HOSTID">mail.slackware.com</tt> for delivery.</p>
-</div>
-</div>
-
-<div class="NAVFOOTER">
-<hr align="LEFT" width="100%" />
-<table summary="Footer navigation table" width="100%" border="0" cellpadding="0"
-cellspacing="0">
-<tr>
-<td width="33%" align="left" valign="top"><a
-href="basic-network-commands-traceroute.html" accesskey="P">Prev</a></td>
-<td width="34%" align="center" valign="top"><a href="index.html"
-accesskey="H">Home</a></td>
-<td width="33%" align="right" valign="top"><a href="basic-network-commands-finger.html"
-accesskey="N">Next</a></td>
-</tr>
-
-<tr>
-<td width="33%" align="left" valign="top"><tt class="COMMAND">traceroute</tt></td>
-<td width="34%" align="center" valign="top"><a href="basic-network-commands.html"
-accesskey="U">Up</a></td>
-<td width="33%" align="right" valign="top"><tt class="COMMAND">finger</tt></td>
-</tr>
-</table>
-</div>
-</body>
-</html>
-