Brian, On Apr 4, 2012, at 8:49 AM, Brian E Carpenter wrote: >> uh, i hate to spoil your fantasy. but large ipv4 deployments want an >> absolutely minimal, compatible, feature-match upgrade to ipv6. > > Yes of course. Isn't that what straight dual stack deployment is > meant to provide? Well, no. Dual stack was meant to allow people to continue to run IPv4 to do IPv4 things and also run IPv6 to do IPv6 things. I believe Randy is saying that the folks who run large IPv4 deployments want IPv6 to (at least) do the same things as IPv4. However, since Dual Stack was a failure as a transition strategy, I'm not sure why raising it is even relevant. Regards, -drc