89 lines
5.2 KiB
HTML
89 lines
5.2 KiB
HTML
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<?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="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Domain Name System support" />
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<meta name="abstract" content="iSeries provides applications with access to the Domain Name System (DNS) through the resolver functions." />
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<meta name="description" content="iSeries provides applications with access to the Domain Name System (DNS) through the resolver functions." />
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<meta name="DC.Relation" scheme="URI" content="aconcepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="cenviron.htm" />
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<meta name="DC.Relation" scheme="URI" content="datac.htm" />
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<meta name="DC.Relation" scheme="URI" content="routines.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rzakk/rzakkkickoff.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/unix8a.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="dns" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Domain Name System support</title>
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</head>
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<body id="dns"><a name="dns"><!-- --></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">Domain Name System support</h1>
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<div><p>iSeries™ provides
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applications with access to the Domain Name System (DNS) through the resolver
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functions.</p>
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<div class="section"><p>The DNS has the following three major components:</p>
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<ul><li><strong>Domain name space and resource records</strong> Specifications for a tree-structured
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name space and the data associated with the names.</li>
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<li><strong>Name servers</strong> Server programs that hold information about the domain
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tree structure and set information.</li>
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<li><strong>Resolvers</strong> Programs that extract information from name servers in
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response to client requests.</li>
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</ul>
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</div>
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<div class="section"><p>The resolvers provided in the i5/OS™ implementation are socket functions
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that provide communication with a name server. These routines are used to
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make, send, update, and interpret packets, and perform name caching for performance.
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They also provide function for ASCII to EBCDIC and EBCDIC to ASCII conversion.
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Optionally, the resolver uses transaction signatures (TSIG) to securely communicate
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with the DNS. </p>
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</div>
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<div class="section"><p> For more information about domain names, see the following RFC,
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which you can locate from the <a href="http://www.rfc-editor.org">RFC search page</a>. </p>
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<ul><li>RFC 1034, "Domain names - concepts and facilities"</li>
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<li>RFC 1035, "Domain names - implementation and specification"</li>
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<li>RFC 1886, "DNS Extensions to support IP version 6"</li>
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<li>RFC 2136, "Dynamic Updates in the Domain Name System (DNS UPDATE)" </li>
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<li>RFC 2181, "Clarifications to the DNS Specification"</li>
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<li>RFC 2845, "Secret Key Transaction Authentication for DNS (TSIG)" </li>
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<li>RFC 3152, "DNS Delegation of IP6.ARPA"</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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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="cenviron.htm">Environment variables</a></strong><br />
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You can use environment variables to override default initialization of resolver functions.</li>
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<li class="ulchildlink"><strong><a href="datac.htm">Data caching</a></strong><br />
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Data caching of responses to Domain Name System (DNS)
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queries is done by i5/OS sockets in an effort to lessen the amount of
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network traffic. The cache is added to and updated as needed.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="aconcepts.htm" title="Advanced socket concepts go beyond a general discussion of what sockets are and how they work. They provide ways to design socket applications for larger and more complex networks.">Advanced socket concepts</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="routines.htm" title="Socket network functions allow application programs to obtain information from the host, protocol, service, and network files.">Socket network functions</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../rzakk/rzakkkickoff.htm">DNS</a></div>
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<div><a href="../apis/unix8a.htm">Sockets Network Functions (Routines)</a></div>
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</div>
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</div>
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</body>
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</html>
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