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Re: [RRG] Re: Fast and sparse mapping?
The problem is that if you have 64k /48s that would be a /32, but
they actually reserve a /44 for each of those /48 users so they use
up a /28.
When the global IPv6 (IANA to RIR) allocation policy was proposed, the
RIRs promised to stop reserving IPv6 address space and allocate from
the /12s they received using the "bisection" method (adding a bit to
the prefix length to split a block in half). The rationale behind
this approach was to limit the number of independent prefixes
allocated to a single ISP because that ISP ran out of space. I am
aware that at least one RIR actually followed through with their
promise. The last time people cared about dense packing address
allocations was around 1993 or so.
Regards,
-drc
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