I don't know what you mean by cernet2.

Cernet in China does provide IPv4 access as well.

But they charge IPv4 traffic and do not charge IPv6 traffic, so student use IPv6 to download movies(in which makes high traffic volume).

On Fri, Jun 12, 2015 at 1:34 PM, Randy Bush <randy@psg.com> wrote:

> One correction to my last post "no provider today will be able provide
> end customer IPv6 access only network"

i believe cernet2 in china does exactly this

randy

--
Kind regards.
Lu