Network World blogger Scott Hogg encountered a funny situation this past week while deploying IPv6 on a tunnel interface. He realized that when you use 10 for the most significant digits in an IPv6 address it does not mean that is the 10th address in that network. We are trained to think in terms of decimals from the very beginning of our education as children. Breaking out of that mindset and thinking in hexadecimal is an essential skill for operating a network in an IPv6 world. As you may know, IPv6 addresses are 128 bits in length (compared to 32-bit IPv4 addresses). Because IPv6 addresses are so long they are typically written in eight segments or "chunks" of four hexadecimal digits.
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