On Mon, Feb 2, 2009 at 9:30 PM, Anthony Roberts <na...@arbitraryconstant.com > wrote:
> It has been my experience that when you give someone a huge address space > to play with (eg 10/8), they start doing things like using bits in the > address as flags for things. Suddenly you find yourself using a prefix > that should enough for a decent sized country in a half-rack. Which is, of course, a core design philosophy for IPv6. Stateless autoconfig relies on the fact that each network will be allocated 2^64 address. On Mon, Feb 2, 2009 at 9:35 PM, Patrick W. Gilmore <patr...@ianai.net>wrote: > Except the RIRs won't give you another /48 when you have only used one > trillion IP addresses. Of course they will! A /48 is only the equivalent of 65536 "networks" (each network being a /64). Presuming that ISPs allocate /64 networks to each connected subscriber, then a /48 is only 65k subscribers, or say around a maximum of 200k IP addresses in use at any one time (presuming no NAT and an average of 3-4 IP-based devices per subscriber) IPv4-style utilization ratios do make some sense under IPv6, but not at the address level - only at the network level. Scott.