v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space

Owen DeLong owen at delong.com
Fri Feb 6 00:21:12 UTC 2009

On Feb 5, 2009, at 11:06 AM, Joe Abley wrote:

> On 5-Feb-2009, at 06:34, Christopher Morrow wrote:
>> to be fair, there are 3 options for multihoming today in v6 (three
>> sanctioned by the IETF, not ordered in any order, not including
>> discussion about goodness/badness/oh-god-no-ness of these)
>> 1) multiple addresses on each device, one per provider
>> 2) shim-6
>> 3) HIP (still in development, as I recall)
> 4) Obtain PA space and do what you're doing with v4.
> 5) Obtain PI space and do what you're doing with v4.
> (4) is problematic because filtering long prefixes in v6 seems to be  
> more energetic than it is in v4. (5) is problematic if you don't  
> qualify for PI space.
Note, however, that the bar for (5) is VERY low if you are
multi-homed.  I would not be opposed to lowering it even
further, but, there does not at this time seem to be community
consensus to do so.


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