83 lines
5.3 KiB
HTML
83 lines
5.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Access external Domain Name System data" />
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<meta name="abstract" content="When you create Domain Name System (DNS) zone data, your server will be able to resolve queries to that zone." />
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<meta name="description" content="When you create Domain Name System (DNS) zone data, your server will be able to resolve queries to that zone." />
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<meta name="DC.Relation" scheme="URI" content="rzakkconfiguring.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakkconfignamesrvrzone.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakkconfigexternal" />
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<meta name="DC.Language" content="en-us" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Access external Domain Name System data</title>
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</head>
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<body id="rzakkconfigexternal"><a name="rzakkconfigexternal"><!-- --></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">Access external Domain Name System data</h1>
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<div><p>When you create Domain Name System (DNS) zone data, your server
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will be able to resolve queries to that zone.</p>
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<p>Root servers are critical to the function of a DNS server that is directly
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connected to the Internet or a large intranet. DNS servers must use root servers
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to answer queries about hosts other than those that are contained in their
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own domain files.</p>
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<p>To reach out for more information, a DNS server has to know where to look.
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On the Internet, the first place that a DNS server looks is the root servers.
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The root servers direct a DNS server toward other servers in the hierarchy
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until an answer is found, or it is determined that there is no answer.</p>
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<div class="section"><h4 class="sectiontitle">iSeries™ Navigator's
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default root servers list</h4><p>You should use Internet root servers only
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if you have an Internet connection and you want to resolve names on the Internet
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if they are not resolved on your DNS server. A default list of Internet root
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server is supplied in iSeries Navigator. The list is current when iSeries Navigator
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is released. You can verify that the default list is current by comparing
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it to the list on the InterNIC site. Update your configuration's root server
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list to keep it current.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Where to get Internet root server addresses</h4><p>The
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top-level root server's addresses change from time to time, and it is the
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DNS administrator's responsibility to keep them current. InterNIC maintains
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a current list of Internet root server addresses. To obtain a current list
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of Internet root servers, follow these steps:</p>
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<ol><li>Anonymous FTP to the InterNIC server: <samp class="codeph">FTP.RS.INTERNIC.NET</samp></li>
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<li>Download this file: <samp class="codeph">/domain/named.root</samp></li>
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<li>Store the file in the following directory path: <samp class="codeph">Integrated File
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System/Root/QIBM/ProdData/OS400/DNS/ROOT.FILE</samp></li>
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</ol>
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<p>A DNS server behind a firewall might have no root servers defined.
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In this case, the DNS server can resolve queries only from entries that exist
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in its own primary domain database files, or its cache. It might forward off-site
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queries to the firewall DNS. In this case, the firewall DNS server acts as
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a forwarder.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Intranet root servers</h4><p>If your DNS server is part
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of a large intranet, you might have internal root servers. If your DNS server
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will not be accessing the Internet, you do not need to load the default Internet
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servers. However, you should add your internal root servers so that your DNS
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server can resolve internal addresses outside of its domain.</p>
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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="rzakkconfiguring.htm" title="This topic explains how to use iSeries Navigator to configure name servers and to resolve queries outside of your domain.">Configure Domain Name System</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzakkconfignamesrvrzone.htm" title="After you configure a Domain Name System (DNS) server instance, you need to configure the zones for the name server.">Configure zones on a name server</a></div>
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</div>
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</div>
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</body>
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</html> |