As with our example in part one, the idea is that you’ve been allocated a sufficiently large block of IPv6 addresses to meet your IPv6 addressing needs for decades. In part two, we’ll discuss the remaining IPv6 prefix allocation methods along with how and when to use them. If you haven’t read part one and are unfamiliar with IPv6 address planning, I encourage you to read it before reading this post. I also listed the four most common methods of IPv6 prefix allocation: next available, sparse, best fit, and random. Part one concluded with a detailed look at the next available allocation technique. In part one, we started our discussion of IPv6 prefix allocation methods with the simple reason of why you need them in the first place: a properly sized IPv6 allocation provides a vast amount of IPv6 space and you need to have one or more methods for logically and sensibly dividing and assigning that space based on the types of networks you are addressing.
