56 lines
3.4 KiB
HTML
56 lines
3.4 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="concept" />
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<meta name="DC.Title" content="Server ports and client ports" />
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<meta name="abstract" content="The TFTP server uses a subnet-directed broadcast address as the destination address." />
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<meta name="description" content="The TFTP server uses a subnet-directed broadcast address as the destination address." />
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<meta name="DC.Relation" scheme="URI" content="rzal5overview.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzal5servclient" />
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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>Server ports and client ports</title>
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</head>
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<body id="rzal5servclient"><a name="rzal5servclient"><!-- --></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">Server ports and client ports</h1>
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<div><p>The TFTP server uses a subnet-directed broadcast address as the
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destination address.</p>
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<p>It also uses a well-known port as the port of datagrams sent to clients
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that have requested the subnet broadcast option. The clients listen for and
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receive datagrams on the well-known port. The keyword for the well-known port
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is <tt>subntbcst_tftp</tt>, and its decimal value is <tt>247</tt>.</p>
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<p>The TFTP server sends subnet-directed broadcast datagrams to clients that
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request the subnet broadcast option. The source ports from which the TFTP
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server sends these datagrams do not have to be unique. They can be arbitrarily
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allocated.</p>
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<p>Some routers filter or block subnet-directed broadcast datagrams. In support
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of router filters, you can define restricted ports for the QTFTP profile.
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If you define restricted ports for the QTFTP profile, the TFTP server uses
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only the defined restricted ports as the source ports for the subnet-directed
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broadcast datagrams. Network administrators define router filtering rules
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to allow subnet-directed broadcast datagrams to pass through router filters
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based on the source port of subnet-directed datagrams being one of the restricted
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ports defined for the QTFTP profile.</p>
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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="rzal5overview.htm" title="Trivial File Transfer Protocol (TFTP) is a simple protocol that provides basic file transfer function with no user authentication.">Trivial File Transfer Protocol</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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