IPv6 in Windows Server 2008

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IPv6 in Windows Server 2008

Post by ManU » Fri Nov 06, 2009 5:24 pm

IPv6 in Windows Server 2008

One of the biggest architectural changes in Windows Server 2008 is the inclusion of IPv6. IPv6 has been a part of Windows since Windows 2000, but Windows Server 2008 is the first version of Windows to enable IPv6 by default. Furthermore, The transport stack has been completely redesigned so that IPv6 and IPv4 are able to run parallel to each other, as shown in Figure A below.
IPv6.jpg (18.78 KiB) Viewed 1530 times
IPv6 Addressing
Like an IPv4 address, an IPv6 address is an abbreviated form of a binary number. For example, here is what a 128 bit binary number looks like:
0000000000000000 0000000000000000 0000001000001100 0010100111111111 1111111001000100 0111111000111111 1111111001000100 0111111000111111

IPv6 address is expressed eight digit chunks called octets. Each of these octets corresponds to one of the numbers in the address (when it is displayed in digital form). IPv6 addresses are expressed in 16 digit chunks when they are displayed in binary form. Unlike IPv4 addresses though, IPv6 addresses are not written in decimal form, but rather in hexadecimal form. Therefore, to see what an IPv6 address looks like, convert each of the 16 digit blocks of numbers above to hexadecimal format, and then separate each hexadecimal number with a colon. The result looks like this:

As you can see, this address is still pretty long. We can (and should) simplify it though. In IPv6 addressing, leading zeros are irrelevant, so let’s rewrite the address with the leading zeros omitted. After doing so, the address above becomes:

Just omitting the leading zeros shortens the address quite a bit, but there is one more thing that can be done. You will notice that three of the values in the address are 0. Any time that you have a series of zeros, you can get rid of all of the zeros, and just use double colons instead. Keep in mind though, that you can only use double colon notation once per address. In this case, the address becomes:
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