72 lines
4.2 KiB
HTML
72 lines
4.2 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="task" />
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<meta name="DC.Title" content="Prevent LPD access" />
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<meta name="abstract" content="These instructions explain how to prevent LDP access." />
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<meta name="description" content="These instructions explain how to prevent LDP access." />
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<meta name="DC.Relation" scheme="URI" content="rzamvtcplpd.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="tcpstoplpd" />
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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>Prevent LPD access</title>
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</head>
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<body id="tcpstoplpd"><a name="tcpstoplpd"><!-- --></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">Prevent LPD access</h1>
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<div><p>These instructions explain how to prevent LDP access.</p>
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<div class="section">If you do not want anyone to use LPD to access your system, you should
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prevent the LPD server from running. Do the following:</div>
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<ol><li class="stepexpand"><span>To prevent LPD server jobs from starting automatically when you
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start TCP/IP, type the following: <samp class="codeph">CHGLPDA AUTOSTART(*NO)</samp></span> <div class="note"><span class="notetitle">Note:</span> <ol type="a"><li>AUTOSTART(*YES) is the default value. </li>
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<li>Control which TCP/IP servers start automatically provides more information
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about controlling which TCP/IP servers start automatically.</li>
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</ol>
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</div>
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</li>
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<li class="stepexpand"><span>To prevent someone from associating a user application, such as
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a socket application, with the port that the system normally uses for LPD,
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do the following:</span><ol type="a"><li><span>Type GO CFGTCP to display the Configure TCP/IP menu.</span></li>
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<li><span>Select option 4 (Work with TCP/IP port restrictions).</span></li>
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<li><span>On the Work with TCP/IP Port Restrictions display, specify option
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1 (Add).</span></li>
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<li><span>For the lower port range, specify 515.</span></li>
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<li><span>For the upper port range, specify *ONLY.</span></li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> <ol type="a"><li>The port restriction takes effect the next time that you start TCP/IP.
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If TCP/IP is active when you set the port restrictions, you should end TCP/IP
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and start it again.</li>
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<li>RFC1700 provides information about common port number assignments.</li>
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</ol>
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</div>
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</li>
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<li class="stepexpand"><span>For the protocol, specify *TCP.</span></li>
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<li class="stepexpand"><span>For the user profile field, specify a user profile name that is
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protected on your system. A protected user profile is a user profile that
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does not own programs that adopt authority and does not have a password that
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is known by other users. By restricting the port to a specific user, you automatically
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exclude all other users.</span></li>
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<li class="stepexpand"><span>Repeat steps 2c through 2g for the *UDP protocol.</span></li>
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</ol>
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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="rzamvtcplpd.htm" title="LPD (line printer daemon) provides the capability to distribute printer output to your system. The system does not perform any sign-on processing for LPD.">Security considerations for LPD</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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