I think everyone knows (or should know) that IP version 4 is on its way out. The real question is when it will happen. Moreover, when will IPv6 become mainstream, reach a tipping point, and render IPv4 less relevant. This entire process will take many years and there are parts of the world that are far beyond the US in the density of their deployment.
The thing that I really find odd is the cyclical nature around the discussion of IPv6. At least two times in the last two years, I have spent quite a bit of time understanding and labbing IPv6. This seemed to be spawned from a lot of discussion in the blogosphere. After labbing and learning, I’d walk away and do very little real world work with it.
Recently, I’ve been hearing about v6 again. Within the last few weeks, I’ve had inquiries and read several blogs about IPv6. Once again, I’ll probably start spending some lab time with it again. My question is this, “Why is the discussion itself cyclical?” Let’s get this protocol up and going. Clean network designs without the complexities of NAT sounds like a great place to me.