* Baldur Norddahl > Single stacking on IPv6 is nice in theory. In practice it just doesn't work > yet. If you as an ISP tried to force all your customers to be IPv6 single > stack, you would go bust.
Kabel Deutschland, T-Mobile USA, and Facebook are examples of companies who have already or are in the process of moving their network infrastructure to IPv6-only. Without going bust. What you *do* need, is some form of connectivity to the IPv4 internet. But there are smarter ways to do that than dual stack. Seriously, if you're building a network today, consider making IPv4 a legacy "app" or service running on top of an otherwise IPv6-only infrastructure. Five years down the road you'll thank me for the tip. :-) Tore
