IPv6, multihoming, and customer allocations

Wed Mar 17 01:06:09 UTC 2010

On 2010.03.16 17:01, Joel Jaeggli wrote:
> 
> 
> On 03/16/2010 07:38 AM, Rick Ernst wrote:
>> Regurgitating the original e-mail for context and follow-up.
>>
>> General responses (some that didn't make it to the list):
>>   - "There really is that much space, don't worry about it."
>>   - /48s for those that ask for it is fine, ARIN won't ask unless it's a
>> bigger assignment
>>   - /52 (or /56) on smaller assignments for conservation if it makes you
>> feel better
>>   - Open question on whether byte/octet-boundary assignment (/56 vs /52) is
>> better for some reason
>>
>> I haven't seen anything on the general feel for prefix filtering.  I've seen
>> discussions from /48 down to /54.  Any feel for what the "standard" (widely
>> deployed) IPv6 prefix filter size will be?
> 
> I filter at /48. 

Although I'm small and insignificant, I do too.

> I would consider filtering on something shorter for
> assignments of /32 or shorter if there were obvious bad behaver's. We do
> advertise more specific /36s but we also have the covering /32.

I think that it's going to filter down into a situation where people who
can allow a prefix might change their policy, given that the originator
is known. That doesn't mean that the next person in the chain will
accept it though.

For me, I'll accept /48's until one of two things happen:

- the RIRs decide that they won't be handing them out anymore
- that my routers can't handle the number of prefixes

Other than that, I'd like to see /48 become a standard for acceptance.

Steve