diff options
Diffstat (limited to 'misc/slackbook/html/basic-network-commands-dns.html')
| -rw-r--r-- | misc/slackbook/html/basic-network-commands-dns.html | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/misc/slackbook/html/basic-network-commands-dns.html b/misc/slackbook/html/basic-network-commands-dns.html deleted file mode 100644 index f8881aad..00000000 --- a/misc/slackbook/html/basic-network-commands-dns.html +++ /dev/null @@ -1,181 +0,0 @@ -<!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" /> -<link rel="STYLESHEET" type="text/css" href="docbook.css" /> -<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> -</head> -<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> - -; <<>> DiG 9.2.2 <<>> @192.168.1.254 www.slackware.com mx -;; global options: printcmd -;; Got answer: -;; ->>HEADER<<- 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. -“@192.168.1.254” specifies the dns server to use. -“www.slackware.com” is the domain name I am performing a lookup on, and -“mx” 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> - |