On 28/01/2010, at 1:51 AM, Randy Bush wrote:
the general intent of a class B allocation is that it is large enough for nearly everybody, with nearly everybody including all but the largest of organisations. That would, indeed, work if we weren't short of class B networks to assign. Would you clarify? Seriously?
we used to think we were not short of class B networks
We also used to have a protocol with less total addresses than the population of the planet, let alone subnets. In 2000::/3, assuming we can use 1 in every 4 /48s because, well, I'm being nice to your point, we still have 1300 /48s per person. http://www.wolframalpha.com/input/?i=%28%282%5E45%29%2F4%29%2Fearth+populati... And that's /48s. What if say 50% of the address space is /48s and 50% of the address space is /56s? Then we have 675,000 networks per person. If we botch that up then we've done amazingly badly. Then we'll move on to 4000::/3. -- Nathan Ward