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IPv6 is a rich extension of IPv4, and many of the details are beyond the scope of this book We encourage you to do additional reading on the subject one of the best places to start is at wwwmicrosoftcom/technet/itsolutions/network/ipv6/defaultmspx Before we dig into some interesting engineering traits of IPv6, we will talk about the characteristics relevant to Vista networking, including Internet Protocol Security (IPSec) and the new IP addressing solution
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Even though the IPv6 header is larger, it is purposefully streamlined to keep overhead to a minimum IPv6 addresses are four times as large, but the IPv6 header is only twice as large as the IPv4 header This streamlined header is designed to be efficiently processed by IPv6-capable router infrastructures It s important to keep in mind that IPv4 headers and IPv6 packet headers are not interoperable, and IPv6 is not a superset of functionality that is backward-compatible with IPv4 A host or router must use an implementation of both IPv4 and IPv6 in order to recognize and process both header formats
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The pool of IPv4 addresses is expected to run dry sometime around 2009 IPv4 provides for 43 billion addresses using a 32-bit addressing scheme Using a 128-bit scheme, IPv6 provides for 340,282,366,920,938,463,463,374,607,431,768,211,456 or 2^128 or 340282366920938E+38 or 50,000,000,000,000,000,000,000,000,000 unique addresses per person on Earth that should be enough (for now) The downside is that 128-bit addresses require more overhead That should be supplanted as computer platforms move toward 64-bit architecture, which handles the larger addresses exceedingly well The large pool of addresses ensures that, for the foreseeable future, end-to-end communications will continue without the need of helper technology, such as NAT The relatively large size of the IPv6 address is designed to be subdivided into hierarchical routing domains that reflect the topology of the modern-day Internet The use of 128 bits allows for multiple levels of hierarchy and flexibility in designing hierarchical addressing and routing, which is currently lacking in the IPv4-based Internet The drawback of the large address size is that IPv6 is less efficient in bandwidth usage, which may hurt regions where bandwidth is limited The benefits of the larger address space include less fragmentation and easier administration of the pool, since organizations can be allocated large blocks, which, in turn, leads to smaller routing tables Unfortunately, IPv6 makes it harder to conceal an organization s addressing scheme, where all hosts multicasts and Directory Service tables list which IPv6 addresses in a range are assigned, and it will be much harder to track down those rogue computers if they occupy an address that has not been legally assigned
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Dynamic configuration does not require a DHCP service for a host with IPv6 IPv6 routers can manage the settings for all hosts within the local internetwork served by the router using a native feature called stateless autoconfiguration Workstations or other devices send a broadcast request for configuration parameters, which is met with a router advertisement packet sent by an IPv6 router that contains IP network-interface layer configuration parameters If you need to manage IP configurations in ways that are not accommodated by the IPv6 router, install the DHCPv6 service on the network to provide stateful autoconfiguration and the necessary management options
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IPv6 easily enables secure channels for routers that use the Border Gateway Protocol (BGP) by encrypting the route protocol when it s transmitted from one router to another And while IPSec support for IPv6 traffic in Windows XP and Windows Server 2003 is limited, Vista s support is much more robust Previous operating systems do not support Internet Key Exchange (IKE) or data encryption IPsec security policies, security associations, and keys are configured through text files and activated through a command-line tool, IPsec6exe In Vista, IPSec support for IPv6 traffic is the same as that for IPv4, including support for IKE and data encryption with AES 128/192/256 The IP Security Policies snap-in now supports the configuration of IPsec policies for
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