76 lines
4.7 KiB
HTML
76 lines
4.7 KiB
HTML
<?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="DC.Type" content="task" />
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<meta name="DC.Title" content="Prevent BOOTP access" />
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<meta name="abstract" content="If you do not have any thin clients attached to your network, you do not need to run the BOOTP server on your system." />
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<meta name="description" content="If you do not have any thin clients attached to your network, you do not need to run the BOOTP server on your system." />
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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.Identifier" content="tcpstopbootp" />
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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 BOOTP access</title>
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</head>
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<body id="tcpstopbootp"><a name="tcpstopbootp"><!-- --></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 BOOTP access</h1>
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<div><p>If you do not have any thin clients attached to your network, you
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do not need to run the BOOTP server on your system. </p>
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<div class="section">It can be used for other devices, but the preferred solution for
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those devices is to use DHCP. Do the following to prevent the BOOTP server
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from running:</div>
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<ol><li class="stepexpand"><span>To prevent BOOTP server jobs from starting automatically when you
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start TCP/IP, type the following: <samp class="codeph">CHGBPA AUTOSTART(*NO)</samp></span> <div class="note"><span class="notetitle">Note:</span> <ol type="a"><li>AUTOSTART(*NO) is the default value.</li>
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<li>“Control which TCP/IP servers start automatically” on page 120 provides
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more information 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 BOOTP,
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do the following:</span> <div class="note"><span class="notetitle">Note:</span> Because DHCP and BOOTP use the same port
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number, this will also inhibit the port that is used by DHCP. Do not restrict
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the port if you want to use DHCP.</div>
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<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 67.</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 *UDP.</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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</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="rzamvtcpbootstrap.htm" title="Bootstrap Protocol (BOOTP) provides a dynamic method for associating workstations with servers and assigning workstation IP addresses and initial program load (IPL) sources.">Security considerations for using Bootstrap Protocol server</a></div>
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</div>
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</div>
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</body>
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</html> |