Ok, let me throw some cold reality water on this discussion... Having built the IP network for the second largest supermarket in the US, worked on the networks for the largest supermarket in the UK, the largest 'chemist' in the UK, built the largest website in the world (2.4 million cc transactions/month with over 460 servers) and coordinated an IP renumber for over 3,300 stores with 30+ devices each, I can say that insisting companies renumber their networks to fit into public IPv6 addresses just isn't going to happen. I have devices that have no need, never will have a need, to ever talk outside of the internal networks, nor do I want some brain dead user to drop some stupid little device on the network and tada, route access to some of my inside network simply because the addresses are valid. I want my inside addresses to be non accessible from the 'real world', ever. If IPv6 can't offer me the luxury (even if it is not valid or justified) then I see no reason to change from IPv4 to IPv6 in the core. Just do it on the periphery. It is VERY expensive to a corporation to accomplish a renumber, and if there is no benefit, then..... I imagine my position is not far off from MOST of the corporate network infrastructure maintainers out there. You must remember to take us into account when talking about global addressing policies. In the end, we pay most the bills. :-) Jerry