88 lines
5.8 KiB
HTML
88 lines
5.8 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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<meta name="DC.Title" content="Example: Single Domain Name System server with Internet access" />
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<meta name="abstract" content="This example depicts a simple subnet with a Domain Name System (DNS) server connected directly to the Internet." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Example: Single Domain Name System server with Internet access</title>
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</head>
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<body id="rzakkscenario2"><a name="rzakkscenario2"><!-- --></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">Example: Single Domain Name System server with Internet access</h1>
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<div><p>This example depicts a simple subnet with a Domain Name System
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(DNS) server connected directly to the Internet.</p>
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<div class="section"><p>The following illustration depicts the same example network from
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the single DNS server for intranet example, but now the company has added
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a connection to the Internet. In this example, the company is able to access
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the Internet, but the firewall is configured to block Internet traffic into
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the network.</p>
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<div class="fignone"><span class="figcap">Figure 1. Single DNS server with Internet access</span><br /><img src="rzakk501.gif" alt="Single DNS server with Internet access." /><br /></div>
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<p>To resolve Internet addresses, you need to do at least one of the
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following tasks:</p>
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<ul><li>Define Internet root servers<p>You can load the default Internet root
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servers automatically, but you might need to update the list. These servers
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can help to resolve addresses outside of your own zone. For instructions for
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obtaining the current Internet root servers, see <a href="rzakkconfigexternal.htm#rzakkconfigexternal">Access external Domain Name System data</a>.</p>
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</li>
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<li>Enable forwarding<p>You can set up forwarding to pass queries for zones
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outside of mycompany.com to external DNS servers, such as DNS servers run
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by your Internet service provider (ISP). If you want to enable searching by
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both forwarding and root servers, you need to set the <samp class="codeph">forward</samp> option
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to <span class="uicontrol">first</span>. The server first tries forwarding and then
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queries the root servers only if forwarding fails to resolve the query.</p>
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</li>
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</ul>
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<p>The following configuration changes might also be required:</p>
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<ul><li>Assign unrestricted IP addresses<p>In the example above, 10.x.x.x addresses
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are shown. However, these are restricted addresses and cannot be used outside
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of an intranet. They are shown below for example purposes, but your own IP
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addresses is determined by your ISP and other networking factors.</p>
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</li>
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<li>Register your domain name<p>If you are visible to the Internet and have
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not already registered, you need to register a domain name.</p>
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</li>
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<li>Establish a firewall<p>It is not recommended that you allow your DNS to
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be directly connected to the Internet. You should configure a firewall or
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take other precautions to secure your iSeries™ server.</p>
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</li>
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</ul>
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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="rzakkexampleparent.htm" title="You can use these examples to understand how to use Domain Name System (DNS) in your network.">Domain Name System examples</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="rzakkconceptdomainisp.htm" title="This topic provides an overview of domain registration, with links to other reference sites for setting up your own domain space.">Domain Name System domain setup</a></div>
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<div><a href="../rzaj4/rzaj4secoverview.htm">iSeries and the Internet security</a></div>
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<div><a href="rzakkconceptquery.htm" title="This topic explains how Domain Name System (DNS) resolves queries on behalf of clients.">Understanding Domain Name System queries</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzakkscenario1.htm" title="This example depicts a simple subnet with a Domain Name System (DNS) server for internal use.">Example: Single Domain Name System server for an intranet</a></div>
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</div>
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</div>
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</body>
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</html> |