ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzal5_5.4.0.1/rzal5servclient.htm

56 lines
3.4 KiB
HTML

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-us" xml:lang="en-us">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="security" content="public" />
<meta name="Robots" content="index,follow" />
<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))' />
<meta name="DC.Type" content="concept" />
<meta name="DC.Title" content="Server ports and client ports" />
<meta name="abstract" content="The TFTP server uses a subnet-directed broadcast address as the destination address." />
<meta name="description" content="The TFTP server uses a subnet-directed broadcast address as the destination address." />
<meta name="DC.Relation" scheme="URI" content="rzal5overview.htm" />
<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
<meta name="DC.Format" content="XHTML" />
<meta name="DC.Identifier" content="rzal5servclient" />
<meta name="DC.Language" content="en-us" />
<!-- All rights reserved. Licensed Materials Property of IBM -->
<!-- US Government Users Restricted Rights -->
<!-- Use, duplication or disclosure restricted by -->
<!-- GSA ADP Schedule Contract with IBM Corp. -->
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
<link rel="stylesheet" type="text/css" href="./ic.css" />
<title>Server ports and client ports</title>
</head>
<body id="rzal5servclient"><a name="rzal5servclient"><!-- --></a>
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
<h1 class="topictitle1">Server ports and client ports</h1>
<div><p>The TFTP server uses a subnet-directed broadcast address as the
destination address.</p>
<p>It also uses a well-known port as the port of datagrams sent to clients
that have requested the subnet broadcast option. The clients listen for and
receive datagrams on the well-known port. The keyword for the well-known port
is <tt>subntbcst_tftp</tt>, and its decimal value is <tt>247</tt>.</p>
<p>The TFTP server sends subnet-directed broadcast datagrams to clients that
request the subnet broadcast option. The source ports from which the TFTP
server sends these datagrams do not have to be unique. They can be arbitrarily
allocated.</p>
<p>Some routers filter or block subnet-directed broadcast datagrams. In support
of router filters, you can define restricted ports for the QTFTP profile.
If you define restricted ports for the QTFTP profile, the TFTP server uses
only the defined restricted ports as the source ports for the subnet-directed
broadcast datagrams. Network administrators define router filtering rules
to allow subnet-directed broadcast datagrams to pass through router filters
based on the source port of subnet-directed datagrams being one of the restricted
ports defined for the QTFTP profile.</p>
</div>
<div>
<div class="familylinks">
<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>
</div>
</div>
</body>
</html>