Re: proposal for RIPE's IPv6-address space structure

[Daniel Karrenberg <]

  > Petri Helenius pete@localhost writes:
  > Using only 56 bits for the IR would effectively defeat the possiblity
  > of using MAC / ESI addresses as the low 48 bits of an IP address.

Sorry I don't get you. The subscriber has 64 bits to play with. 
That gives 16 bits to select the physical subnet if you choose to 
use 48 bits for MAC. Do we have a misunderstanding?

Here is the lenghts from msb in my proposal:

  3 - Provider-Based Unicast Address prefix (010)
  5 - regional IR ID (32 is plenty)
  r - local IR ID (r=56-s)
  s - subscriber ID (s=56-r)
 64 - subscriber local addressing (maybe 16+48 for Petri)
---
128
===

The values for r would be determined similarly as with current policies:

1) new local IRs get a fixed size allocation
2) furhter allocations will be determined according to usage rate.

Detailed policies such as ranges for r subject to further discussion.

Daniel