79 lines
4.6 KiB
HTML
79 lines
4.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Verify Domain Name System function with Name Server Lookup" />
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<meta name="abstract" content="You can use Name Server Lookup (NSLookup) to verify that Domain Name System (DNS) is working." />
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<meta name="description" content="You can use Name Server Lookup (NSLookup) to verify that Domain Name System (DNS) is working." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Verify Domain Name System function with Name Server Lookup</title>
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</head>
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<body id="rzakkmanagingverify"><a name="rzakkmanagingverify"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Verify Domain Name System function with Name Server Lookup</h1>
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<div><p>You can use Name Server Lookup (NSLookup) to verify that Domain
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Name System (DNS) is working.</p>
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<div class="section"><p>Use NSLookup to query the DNS server for an IP address. This verifies
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that the DNS server is responding to queries. Request the host name that is
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associated with the loopback IP address (127.0.0.1). It should respond with
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the host name (localhost). You should also query specific names that are defined
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in the server instance that you are trying to verify. This will confirm that
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the specific server instance you are testing is functioning properly.</p>
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<p>To
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verify DNS function with NSLookup, follow these steps:</p>
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</div>
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<ol><li class="stepexpand"><span>At the command line, type <kbd class="userinput">NSLOOKUP DMNNAMSVR(n.n.n.n)</kbd>,
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where n.n.n.n is an address that you have configured the server instance you
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are testing to listen on.</span></li>
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<li class="stepexpand"><span>At the command line, type <kbd class="userinput">NSLOOKUP</kbd> and press
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Enter. This starts an NSLookup query session.</span></li>
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<li class="stepexpand"><span>Type <kbd class="userinput">server</kbd> followed by your server name
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and press Enter. For example: <samp class="codeph">server myiseries.mycompany.com</samp>.
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This information displays: </span> <pre> Server: myiseries.mycompany.com
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Address: n.n.n.n</pre>
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Where <samp class="codeph">n.n.n.n</samp> represents your DNS server's IP
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address.</li>
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<li class="stepexpand"><span>Enter <kbd class="userinput">127.0.0.1</kbd> on the command line and
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press Enter. </span> <p>This information should display, including the
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loopback host name:</p>
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<pre> > 127.0.0.1
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Server: myiseries.mycompany.com
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Address: n.n.n.n
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<span class="uicontrol">Name: localhost</span>
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Address: 127.0.0.1 </pre>
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<p>The DNS server is responding correctly if it returns the loopback
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host name: <span class="uicontrol">localhost</span>.</p>
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</li>
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<li class="stepexpand"><span>Type <kbd class="userinput">exit</kbd> and press Enter to quit the NSLOOKUP
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terminal session.</span></li>
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</ol>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> If you need help using NSLookup, type <kbd class="userinput">?</kbd> and
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press Enter.</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakkmanaging.htm" title="This topic discusses how to verify Domain Name System (DNS) function, monitor performance, and maintain DNS data and files.">Manage Domain Name System</a></div>
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</div>
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</div>
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</body>
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