On Mon, Feb 2, 2009 at 9:35 PM, Patrick W. Gilmore <patrick@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.
First, it was (mostly) a joke.
Second, where did you get 4 users per /64? Are you planning to hand each cable modem a /64?
No, we should hand each home a /56 (or perhaps a /48, for the purists out there) - allowing for multiple segments (aka subnet, aka links, etc.). Note - the actual number of hosts is irrelevant; the 64 bits on the host side of the address are not meant to encourage 18BB hosts/segment. Oh, and utilization should be based on /56s anyway. /TJ