i am asking for a pure IPv6 network… where we dnt have any IPv4 network… IPv6 is going to be the future…
In defence of my previous answer..
The ISP probably only offers an IPv4 service, so you need to tunnel the IPv6 inside IPv4 to provide the connection between the end user and the Central site. That is why I said you need to speak to the ISP and see if they can offer an end-to-end IPv6 service. If the two ends are different ISPs then the odds go down.
You haven’t done your profile, so I don’t know where in the World you are located. The availability of an IPv6 solution will vary depending on where you are as much as anything else.