IPv6 Default Allocation - What size allocation are you giving out

Owen DeLong owen at delong.com
Thu Oct 9 16:20:14 UTC 2014


On Oct 9, 2014, at 7:31 AM, Faisal Imtiaz <faisal at snappytelecom.net> wrote:

>>> Selection of a default prefix is easy.  Here are the steps.
>>> 
>>> 4. Keeping in mind
>>> 
>>>        4.1 Prefixes longer than somewhere around /48 to /56 may be
>>>        excluded from the global routing table
>> 
>> 4.1a Prefix cutouts of any size (including /48) from inside your /32
>> or larger block may be excluded from the global routing table. Folks
>> who are multihomed and thus need to advertise their own block with BGP
>> should be referred to ARIN for a direct assignment. Folks who aren't
>> multihomed, well, until given evidence otherwise I claim there are no
>> single-homed entities who will use 65,000 LANs, let alone more.
> =============================================
> 
> This brings up another interesting question...
> 
> We operate Two separate networks in two geographical locations (Two ASN), we have a single /32 allocation from ARIN.
> 
> Question:  Should we be asking ARIN for another /32 so that each network has it's own /32  or should be break out the /32 into /36 and use these in each of the geographies ?

Depends on your needs… Either is a viable solution, depending on your circumstances. ARIN has an MDN policy which would facilitate your acquisition of a second /32.

Owen




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