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During the early-to-mid-1990s, concern began to grow about the diminishing number of IPv4 addresses The temporary solution to solve this problem was to set aside an address space, called private addresses, which anyone could use in a public network Recall from s 7 and 23 that these addresses are defined in RFC 1918: 10000/8, 1721600 17231255255, and 19216800 192168255255 And to access a public network, address translation was used to translate the private addressing information to a public address, commonly with static Network Address Translation (NAT) translations for internal services and dynamic overloading (Port Address Translation, or PAT) for user connection However, many changes in the marketplace are quickly reaching the point where address translation won t be enough: there won t be any public addresses left to
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Necessity of IPv6
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translate to Here are some valid reasons why companies are beginning to migrate to an IPv6 environment:
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Currently more than 1 billion people are connected to the Internet, and this
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is exponentially increasing based on fast-emerging technical markets such as China and India
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More than 1 billion mobile phones are currently on the market, most of
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which support limited data services, and this is expected to grow not only in numbers, but also with the enhanced offerings of data services these phone and providers are capable of delivering
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More than 30 million PDAs and similar devices offer common data services
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such as e-mail and web browsing, and this number is expected to grow as more and more businesses implement mobile applications
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More data services are being offered on consumer products, such as
automobiles, household appliances, and industrial devices, and this number is expected to grow into the billions As you can see, it s not a matter of if this is going to happen, and not even when it s going to happen, but how soon in the near future this is going to happen Some people have predicted that IPv4 addresses will run out in 2008 or 2009, and some as late as 2013 Some countries have already begun the conversion process For example, as of 2003, the US Department of Defense has mandated that all new network equipment support IPv6 Likewise, beginning in 2008, the US government has mandated that all government agencies core networks run IPv6 Other countries such as Japan and China are quickly adopting the new standard Imagine a future in the next decade where from your cell phone you can change the channels on your TV, call home and program the microwave to turn on, or stream content from your TV provider to your PC and then to a network storage device that your TV can quickly access As you can see, for communication to take place between all these devices, they ll need an addressing structure, and most companies are basically relying on TCP/IP to provide this For example, Sony has already mandated that, as of 2005, all of its products support IPv6
IPv6 Features
Obviously, the replacement for IPv4 needs to support enough addresses for this growing demand, but it also needs to provide ease of use and configuration,
24: IPv6
enhanced security, and the ability to interoperate with IPv4 as the transition takes place Here are some features built into IPv6:
Very large address space
IPv6 s large address space deals with global growth, where route prefixes can be easily aggregated in routing updates Support for multihoming to ISPs with a single address space is easily accomplished Autoconfiguration of addressing information, including the capability of including MAC addresses in the IP address, as well as plug-andplay options, simplifies address management Renumbering and modification of addresses is easily accommodated, as well as public-to-private readdressing without involving address translation IP security (IPSec) is built into IPv6, whereas it is an awkward add-on in IPv4 With IPv6, two devices can dynamically negotiate security parameters and build a secure tunnel between them with no user intervention With the growth of mobile devices, such as PDAs and smart phones, devices can roam between wireless networks without breaking their connections The IPv6 encapsulation is simpler than IPv4, providing faster forwarding rates by routers and better routing efficiency No checksums are included, reducing processing on endpoints No broadcasts are used, reducing utilization of devices within the same subnet QoS information is built into the IPv6 header, where a flow label identifies the traffic; this alleviates intermediate network devices from having to examine contents inside the packet, the TCP/UDP headers, and payload information to classify the traffic for QoS correctly Various solutions exist to allow IPv4 and IPv6 to successfully coexist when migrating between the two One method, dual stack, allows you to run both protocols simultaneously on an interface of a device A second method, tunneling, allows you to tunnel IPv6 over IPv4 and vice versa to transmit an IP version of one type across a network using another type Cisco supports a third method, referred to as Network Address Translation-Protocol Translation (NAT-PT), to translate between IPv4 and IPv6 (sometimes the term Proxy is used instead of Protocol)
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