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[address-policy-wg] IPv6 allocations for 6RD
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michael.dillon at bt.com
michael.dillon at bt.com
Fri Nov 27 11:04:20 CET 2009
> Fair enough, I'll bite. Given 2^32(or 4 billion) IPv4 > addresses, and say, 4 million IP's allocated to the average > ISP (I'm being generous > here) there's your 0.1%. The rest of the space will go unused > since we're using 32 bits to identify these sparse blocks in > the v4->v6 translation. Not counting customer /56s, 48s, /60s > or whatever. But customers, and /56s are the essential things to count. Again, you just throw in the number 4 million without explaining where it comes from. IPv4 ISPs come in all sizes with one /24 allocation and some with many allocations of sizes ranging from /17 to /12. Counting IP addresses in IPv6 makes no sense. The addressing hierarchy of IPv6 is designed to have large blocks of unused and unusable addresses. This is both to allow for expansion without changing the network architecture, and to allow for automated address assignment functions which rely on large sparse number spaces to avoid collisions. --Michael Dillon
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