76 lines
5.3 KiB
HTML
76 lines
5.3 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Establish a DRDA or DDM connection over TCP/IP" />
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<meta name="abstract" content="To initiate a DDM server job that uses TCP/IP communications support, the DRDA Application Requester or DDM source system will connect to the well-known port number, 446 or 447. The DDM server also listens on port 448, but only for use with connections, which are not supported by DB2 Universal Database for iSeries application requesters or DDM clients." />
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<meta name="description" content="To initiate a DDM server job that uses TCP/IP communications support, the DRDA Application Requester or DDM source system will connect to the well-known port number, 446 or 447. The DDM server also listens on port 448, but only for use with connections, which are not supported by DB2 Universal Database for iSeries application requesters or DDM clients." />
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<meta name="DC.subject" content="TCP/IP communications, establishing, subsytem, user-defined" />
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<meta name="keywords" content="TCP/IP communications, establishing, subsytem, user-defined" />
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<meta name="DC.Relation" scheme="URI" content="rbal1sockcon.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/strtcpsvr.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Establish a DRDA or DDM connection over TCP/IP</title>
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</head>
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<body id="rbal1estcom"><a name="rbal1estcom"><!-- --></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">Establish a DRDA or DDM connection over TCP/IP</h1>
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<div><p>To initiate a DDM server job that uses TCP/IP communications support,
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the DRDA<sup>®</sup> Application
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Requester or DDM source system will connect to the well-known port number,
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446 or 447. The DDM server also listens on port 448, but only for use with
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connections, which are not supported by <span class="keyword">DB2 Universal Database™ for iSeries™</span> application
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requesters or DDM clients.</p>
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<div class="example"> <div class="fignone" id="rbal1estcom__rbal1drdaddm"><a name="rbal1estcom__rbal1drdaddm"><!-- --></a><span class="figcap">Figure 1. DRDA/DDM TCP/IP server</span><br /><div class="imageleft"><img src="rv4w205.gif" alt="DRDA/DDM TCP/IP Server" /></div><br /></div>
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</div>
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<div class="section"><p><span>1</span>. The DDM listener program must have been started (by
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using the Start TCP/IP Server (STRTCPSVR SERVER(*DDM)) to listen for and accept
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the client's connection request.</p>
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<p>The DDM listener, on accepting this
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connection request, will issue an internal request to attach the client's
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connection to a DDM server job <span>2</span>. This server job might be a prestarted
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job or, if the user has removed the QRWTSRVR prestart job entry from the QUSRSYS
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or user-defined subsystem (in which case prestart jobs are not used), a batch
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job that is submitted when the client connection request is processed. The
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server job will handle any further communications with the client.</p>
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</div>
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<div class="section"><p>The initial data exchange that occurs includes a request that
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identifies the user profile under which the server job is to run <span>3</span>.
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</p>
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<p>After the user profile and password (if it is sent with the user profile
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ID) have been validated, the server job will swap to this user profile as
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well as change the job to use the attributes, such as CCSID, defined for the
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user profile <span>4</span>.</p>
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</div>
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<div class="section"><p>The functions of connecting to the listener program, attaching
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the client connection to a server job and exchanging data and validating the
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user profile and password are comparable to those performed when an APPC program
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start request is processed.</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="rbal1sockcon.htm" title="There are several concepts that pertain specifically to the TCP/IP communications support used by DRDA and DDM.">TCP/IP communication support concepts for DDM</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="../cl/strtcpsvr.htm">Start TCP/IP Server (STRTCPSVR) command</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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