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<h1 class="topictitle1">Domain Name System requirements</h1>
<div><p>This topic describes the software requirements to run Domain Name
System (DNS) on your iSeries™ server.</p>
<p>The DNS option (Option 31) does not install automatically with the base
operating system. You must specifically select DNS for installation. The new
DNS server added for OS/400<sup>®</sup> V5R1 is based on the industry-standard DNS
implementation known as BIND 8. Previous OS/400 DNS services were based on BIND
4.9.3, and are still available in OS/400 V5R1.</p>
<p>After DNS is installed, you are by default configured to set up a single
DNS server using the BIND 4.9.3-based DNS server capabilities that were available
in previous releases. If you want to run one or more DNS servers using BIND
8, you must install PASE. PASE is SS1 Option 33. After PASE is installed, iSeries Navigator
automatically handles configuring the correct BIND implementation.</p>
<p>If you do not use PASE, you will not be able to take advantage of all of
the BIND 8 features. If you do not use PASE, you can still run the same DNS
server based on BIND 4.9.3 that was available in previous releases. See the
V4R5 DNS information center topic for BIND 4.9.3 documentation.</p>
<p>If you want to configure a DHCP server on a different iSeries to
send updates to this DNS server, Option 31 must be installed on DHCP iSeries as
well. The Dynamic Host Configuration Protocol (DHCP) server uses programming
interfaces provided by Option 31 to perform dynamic updates.</p>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rzakkifdnsinstalled.htm">Determine if Domain Name System is installed</a></strong><br />
</li>
<li class="ulchildlink"><strong><a href="rzakkinstalldns.htm">Install Domain Name System</a></strong><br />
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakkkickoff.htm" title="Domain Name System (DNS) is a distributed database system for managing host names and their associated Internet Protocol (IP) addresses.">Domain Name System</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="../rzalf/rzalfintro.htm">Portable Application Solutions Environment (PASE)</a></div>
<div><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>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="rzakkconceptbind.htm" title="Besides dynamic updates, BIND 8 offers several features to enhance performance of your Domain Name System (DNS) server.">BIND 8 features</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="rzaismst.pdf" target="_blank">V4R5 DNS Information Center topic</a></div>
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