v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space (IPv6-MW)]
mmc at internode.com.au
Fri Feb 6 04:42:54 CST 2009
My comment was regarding customers believing that they were going to,
by default, get a statically allocated range, whatever the length.
If most customers get dynamically assigned (via PD or other means)
then the issue is not a major one.
On 06/02/2009, at 8:56 PM, Paul Jakma wrote:
> On Thu, 5 Feb 2009, Matthew Moyle-Croft wrote:
>> DHCP(v6). Setting the idea in people's heads that a /64 IS going
>> to be their own statically is insane and will blow out provider's
>> own routing tables more than is rational.
> Routing table size will be a function of the number of customers -
> *not* the prefix length assigned to them (for so long as address
> space is sufficiently sparsely allocated that there's a 1:1 mapping
> from customer to prefix - which should be "for a long time" with
> So (within that longer term constraint) it doesn't matter if you're
> allocating your customer a /48, /56 or /64.
> Indeed, what you're suggesting - smaller-than-64 allocations -
> *would* increase routing table sizes. With your proposal those
> indexes would increase greatly in depth (and possibly other space
> increases due to not being able to optimise for "hierarchical
> routing of bits past 64 is highly rare").
> Think of IPv6 as a 64bit network address + host address. At least
> for now.
> Paul Jakma paul at clubi.ie paul at jakma.org Key ID: 64A2FF6A
> If you don't have a nasty obituary you probably didn't matter.
> -- Freeman Dyson
Matthew Moyle-Croft Internode/Agile Peering and Core Networks
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