66 lines
3.9 KiB
HTML
66 lines
3.9 KiB
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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Secure the DNS server" />
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<meta name="abstract" content="This article provides recommendations for securing the DNS server." />
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<title>Secure the DNS server</title>
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</head>
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<body id="tcpsecdns"><a name="tcpsecdns"><!-- --></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">Secure the DNS server</h1>
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<div><p>This article provides recommendations for securing the DNS server.</p>
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<p>Following are security considerations when you choose to run DNS on your
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system:</p>
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<ul><li>The function that the DNS server provides is IP address translation and
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name translation. It does not provide any access to objects on your system.
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Your risk when an outsider accesses your DNS server is that the server provides
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an easy way to view the topology of your network. Your DNS might save a hacker
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some effort in determining the addresses of potential targets. However, your
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DNS does not provide information that will help to break into those target
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systems.</li>
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<li>Typically, you use the DNS server for your intranet. Therefore, you probably
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do not have a need to restrict the ability to query the DNS. However, you
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might, for example, have several subnetworks within your intranet. You might
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not want users from a different subnetwork to be able to query the DNS on
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your system. A security option of DNS lets you limit access to a primary domain.
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Use iSeries™ Navigator
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to specify IP addresses to which the DNS server should respond.<p>Another
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security option lets you specify which secondary servers can copy information
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from your primary DNS server. When you use this option, your server will accept
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zone transfer requests (a request to copy information) only from the secondary
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servers that you explicitly list.</p>
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</li>
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<li>Be sure to carefully restrict the ability to change the configuration
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file for your DNS server. Someone with malicious intent could, for example,
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change your DNS file to point to an IP address outside your network. They
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could simulate a server in your network and, perhaps, gain access to confidential
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information from users that visit the server.</li>
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</ul>
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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="rzamvtcpdns.htm" title="These articles discuss methods for securing the DNS server for authorized users and preventing access to the DNS server.">Security considerations for using DNS server</a></div>
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