> Pekka Savola > Exactly. As we have been saying for years not, > we must aim for co-existence of IPv4 and IPv6, > not replacing IPv4 with IPv6. IPv6 is currently not worth the price of dual-stack, which is the very reason it is not being deployed. As of transition mechanisms, they're not good enough to run an IPv6-only network, which in turns makes dual-stack mandatory. Michel.