Re: [v6ops] Chair decision on WGLC for draft-ietf-v6ops-dhcp-pd-per-device-04

[Philip Homburg <[e-mail]>]

>This was actually bit of sarcasm. The reaction to Jordi as he suggested tha
>t we could give 1 /48 to every human on the planet and be good X years to c
>ome. :-)

There's a thing a I don't undestand in the current discussion. The practical
problem we need to solve is to make sure that any device that has a 
downstream ethernet or wifi interface can connect devices on those links.

Any wifi or ethernet device has an (in theory) worldwide unique 48-bit MAC
address. Obviously there are other technologies that using 64-bit MACs, but
the vaste majority of devices that need internet access have 48-bit MACs.

So basically, the discussion is whether we can fit the space of 48-bit
mac addresses into the space of /64 IPv6 prefixes.

Which would require an HD-ratio of 0.75. I think that falls within historical
requirements for allocation density.

Obviously, if a (virtual) device class would be expected to be more numerous
than ethernet-like devices, then we may need to have longer prefixes for those.
But that the moment I don't see that happening.