Re: [RRG] Re: Fast and sparse mapping?

[David Conrad <drc@virtualized.org>]

> 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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