> > A fixed length network portion is also simpler and easier to=20
> > administer and operate if you have the opportunity, which is=20
> > why I'm an advocate for /48s for nearly everybody. Leaving=20
> > the problems of dealing with the complexity of variable=20
> > length prefixes to the expert employees of the network=20
> > service providers, not their customers, makes good sense to me.
> > Again, I think people who've worked with Novell IPX or=20
> > Appletalk would also agree.
>
> Then you need to get involved in setting RIR policy because this concept
> of the fixed /48 network size is already starting to disappear. Nobody
> from the IETF was available to explain why the designers of IPv6
> intended for /48 to be the fixed length network size when ARIN passed a
> policy to allow ISPs to allocate /56s to consumer customers. Even though
> the ARIN decision was not a bad one, unless better understanding of the
> IPv6 design is communicated, then the /48 boundary will fade away and
> everyone will have to renumber their networks when they change
> providers.
>
> --Michael Dillon
While end sites are expected to be given a /48, that was
expected to be divided into 65536 subnets of /64. Whether
you used all the 65536 subnets didn't matter. It was enough
subnets to cover all but the very large enterpises.
Even if you needed more it should not be a real issue for
ISP's to supply you with a /47 to give you 131072 subnets.
Moving ISPs should still be easy as you are only equivalent
to two customers.
I suspect with /56 there will end up being a reasonable
number of exception customers. Enough I suspect that ISP's
will maintain two pools. One for /56's and one for /48's.
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [EMAIL PROTECTED]
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