84 lines
5.8 KiB
HTML
84 lines
5.8 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="What is IPv6?" />
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<meta name="abstract" content="Find out why Internet Protocol version 6 (IPv6) is replacing Internet Protocol version 4 (IPv4) as the Internet standard, and how you can use it to your advantage." />
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<meta name="description" content="Find out why Internet Protocol version 6 (IPv6) is replacing Internet Protocol version 4 (IPv4) as the Internet standard, and how you can use it to your advantage." />
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<meta name="DC.Relation" scheme="URI" content="rzai2ipv6intro.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzai2ipv6func.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzai2ipv6relatedinfo.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="ipv6whatis" />
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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>What is IPv6?</title>
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</head>
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<body id="ipv6whatis"><a name="ipv6whatis"><!-- --></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">What is IPv6?</h1>
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<div><p>Find out why Internet Protocol version 6 (IPv6) is replacing Internet
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Protocol version 4 (IPv4) as the Internet standard, and how you can use it
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to your advantage.</p>
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<p>IPv6 is the next evolution in Internet Protocol. Most of the Internet
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uses IPv4, and this protocol has been reliable and resilient for over 20 years.
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However, IPv4 has limitations that might cause problems as the Internet expands.</p>
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<div class="p">In particular, there is a growing shortage of IPv4 addresses, which are
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needed for all new devices added to the Internet. The key to IPv6 enhancement
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is the expansion of the IP address space from 32 bits to 128 bits, enabling
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virtually unlimited, unique IP addresses. The new IPv6 address text format
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is: <pre>xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx</pre>
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where each <samp class="codeph">x</samp> is a hexadecimal digit representing
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4 bits.</div>
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<p>The expanded addressing capability of IPv6 provides a solution to the address
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depletion problem. This is especially important as more people use mobile
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computers, such as mobile telephones and handheld computers. The increasing
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demands of wireless users contribute to the depletion of IPv4 addresses. The
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expanded IP address capability of IPv6 provides enough IP addresses for the
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growing number of wireless devices.</p>
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<p>In addition to this addressing capability, IPv6 provides new functions
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that simplify the tasks of configuring and managing the addresses on the network.
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Configuring and maintaining networks is a labor-intensive activity. IPv6 reduces
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some of the workload by automating several of the network administrator's
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tasks.</p>
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<p><img src="./delta.gif" alt="Start of change" />If you use IPv6, you do not have to renumber your device
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addresses when you change to a different Internet service provider (ISP).
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Site renumbering is an important architectural element of IPv6, and is largely
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automatic. The lower half of your IPv6 address will remain unchanged, because
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this is traditionally the MAC address of your Ethernet adapter. A new IPv6
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prefix will be assigned to you by the ISP, and this new prefix can be distributed
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to all of the end hosts by updating the IPv6 routers in the network and allowing
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IPv6 stateless autoconfiguration to "re-learn" the new prefix.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />The IPv6 autoconfiguration feature automatically
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configures interface addresses and default routes for you. In stateless autoconfiguration,
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IPv6 takes the MAC address of the machine and a network prefix provided by
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a local router and combines these two addresses to create a new, unique IPv6
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address. This feature eliminates the need for a Dynamic Host Configuration
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Protocol (DHCP) server.<img src="./deltaend.gif" alt="End of change" /></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="rzai2ipv6intro.htm" title="The Internet Protocol version 6 (IPv6) plays a key role in the future of the Internet, and you can use IPv6 on the iSeries server. This topic provides general information about IPv6 and how it is being implemented on the server.">Internet Protocol version 6</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzai2ipv6func.htm" title="Learn how IPv6 is being implemented on the iSeries server.">What IPv6 functions are available?</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="rzai2ipv6relatedinfo.htm" title="You can use these links to resources that help you understand IPv6.">Related information for IPv6</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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