Globally-unique does not imply globally-reachable. Any security feature you dream up for IPv4 can be applied to IPv6 as well. The fundamental issue is not pub

Globally-unique does not imply globally-reachable. Any security feature you dream up for IPv4 can be applied to IPv6 as well. The fundamental issue is not public vs. private, it's whether you want to design new technology around an address space that's far too small. Here's the spec for IPv6 over BLE: http://tools.ietf.org/html/draft-ietf-6lo-btle-01 http://tools.ietf.org/html/draft-ietf-6lo-btle-01