[ppml] [address-policy-wg] Those pesky ULAs again

Note: soryr for the previous message, I hit the wrong key and sent it by
accident	

Hi Randy, 

> ok, i give.  if ula address space is assigned/managed by 
> registries, how is it actually different from pi space?

Basically ULA space has the same 'routability' as RFC1918 space, with the
added benefit of less (or in case of ULA central: no) possibility for
conflicting addresses when merging/connecting separate networks. PI space is
expected to be routed globally (if the user of the space wants to).

> if ipv6 space is effectively infinite (and we once thought ipv4 space
> was), then what is the use of ula address space?  why not just assign
> vanilla ipv6 space?

At this moment there is no IPv6 PI space (yet) in the RIPE region. When
there is PI space, there will maybe be recurring costs for it (RIPE policy
proposal 2007-01 is in discussion now). ULA space is free to use and has a
low possibility of conflicts, and ULA Central will probably have one-time
fee and is globally unique. So the main reason will probably be cost...

- Sander