Before someone starts it, the debate between transition protocols to use is well and truely over. Teredo and 6to4 have been chosen for use by the software vendors of the end systems. (fine by me)
This is misleading. You are using IPv6 jargon (transition protocol) whose meaning is not obvious. For most ISPs, "transition" refers to the entire series of steps up to running a ubiquitous IPv6 network where IPv4 is a legacy support service. In that sense, Teredo and 6to4 are not magic bullets because they merely deal with the first steps of such a transition. I do agree that Teredo and 6to4 are very important right now, as far as taking actions, but for planning, we need to look well beyond IPv6 transition protocols. Since we are all collectively playing catchup at this point, it would be very useful for some clear guidance on who needs to deploy Teredo and 6to4 and where it needs to be deployed. Also, the benefits of deployment versus the problems caused by not having it. Should this be in every PoP or just somewhere on your network? Are there things that can be measured to tell you whether or not lack of Teredo/6to4 is causing user problems? --Michael Dillon