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Using IPv6 with prefixes shorter than a /64 on a LAN

In message <4D4EB93E.6000409 at brightok.net>, Jack Bates writes:
> On 2/5/2011 11:57 PM, Mark Andrews wrote:
> >
> > Rationalising to power of 2 allocations shouldn't result in requiring
> > 256 times the space you were claiming with the 8 bits of shift on
> > average.  A couple of bits will allow that.
> >
> I didn't claim 8 bit average (if I accidentally did, my apologies). I 
> claimed a minimum of 8 bits. Somewhere between 12 and 16 is more likely. 
> However, with new ARIN proposals, we will see shorter shifts (yet still 
> over 8 bit shifts) as it does nibble allocations for everything (pop 
> assignments nibble aligned, ISP allocations nibble aligned, ISP to ISP 
> reallocation policies). It treats utilization as a 75% bar with nibble 
> alignments to allow for proper growth at the ISP level.

Why would a pop need to be nibble aligned?  Customers should be
nibble aligned as it requires a delegation in the DNS.  A pop doesn't
need a delegation in the DNS.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org