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Microsoft Forefront UAG 2010 Administrator's Handbook by Ran Dolev, Erez Ben-Ari

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IPv6—what's the big deal?

Many years ago, when the internet was conceived in the blazing minds of some DARPA engineers, they figured they needed to assign each computer a unique address, but they failed to anticipate just how popular the internet would become. The original paradigm for IP addressing, as you know, assigns each host an address composed of 4 numbers, each ranging from 0 to 255. In theory, this allows for a little over 4 billion different numbers, but even that large allocation turned out to be too small rather fast. Early on, many organizations were taking up blocks of 65,536 addresses, and some even grabbing blocks of 16,777,216 addresses, and life was nice and easy. However, as more and more users and organizations got connected, ...

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