Why do we still need IPv4 when we are migrating to IPv6...

[Anfinsen, Ragnar]

Hi guys.

I am working with my management team to implement IPv6, but I got an 
interesting question from one of the managers; Why do we need more IPv4 if 
we are moving towards IPv6?

A quick background; We are having discussions around IPv4 and IPv6 and the 
need to eventually buy more IPv4 addresses to keep a premium level on our 
Internet access.

My argument is that we need addresses as long as there are important 
services that only do IPv4 (yes, there are still a few, especially in 
Norway), and as long as the other ISP are reluctant to implement IPv6 
(luckily in Norway, all the major ISPs have already come a long way). When 
IPv6 reaches critical mass is the $5000 dollar question which I wish I had 
the answer for.

So, any thoughts on this topic, and any qualified guesses on when we no 
longer need to do IPv4 and still be able to call our internet product 
premium?

/Ragnar
Altibox AS