On Mon, Jun 14, 2010 at 2:05 PM, Greg Whynott Greg.Whynott@oicr.on.ca wrote: > all i can say is wow... ?an IPv6 /32 is 65536 /48 subnets, > ?or?18,446,744,073,709,552,000?IPs, ?which is the internet IP space today > squared!

I started researching IPv6 and geographic addressing/routing schemes at about the same time. I did a quick calculation one day, to determine that a single IPv6 /64 subnet would be sufficient for a simple geographic addressing scheme, where every node gets a 64-bit address corresponding to a 32-bit latitude and 32-bit longitude number. That address scheme would be sufficient for a unique node on every square centimeter of the Earth's surface, including oceans and glaciers. I didn't even bother calculating the concentration this would create at the poles. I'm sure a scheme that warps the address allotments to concentrate towards the equator and land masses would be more efficient, but with that much address space overkill, why even bother?

That said, I'm sure some form of "smart sand" nanoscale sensor network will be developed eventually, and it will be capable of saturating its IPv6 subnet. I look forward to the new 256-bit IP address scheme, where every atom in the known Universe can have its own unique IP address. I will still want a NAT gateway on my network, regardless.

;) Jared

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