nanog mailing list archives

Re: filtering /48 is going to be necessary


From: Owen DeLong <owen () delong com>
Date: Fri, 9 Mar 2012 20:41:00 -0800

This varies from RIR to RIR.

In the ARIN region, you can get assignments or allocations for Multiple Discreet Networks, but, ARIN will often 
register them as an aggregate in the registration database, so...

In the RIPE region (which is where I believe Sander is), only aggregates are available to the best of my knowledge.

Owen

On Mar 9, 2012, at 3:40 PM, George Herbert wrote:

If the LIRs cannot get separate allocations from the RIR (and separate
ASNs) for this usage, something is wrong.

We want to make things as simple and efficient as possible, but no
simpler or more efficient, because the curves go back up again at that
point, and we all suffer.


-george

On Fri, Mar 9, 2012 at 3:32 PM, Sander Steffann <sander () steffann nl> wrote:
Hi,

What should happen is this  "quasi-legitimate"  method  of
multi-homing should just be declared illegitimate for IPv6, to
facilitate stricter filtering. Instead, what should happen is the
multi-homing should be required to fit into one of 3 scenarios,  so
any announcement with an IPv6 prefix length other than the
RIR-allocated/assigned PA or PI block size can be  treated as TE and
summarily discarded or prioritizes when table resources are scarce.

Splitting the allocation can be done for many reasons. There are known cases where one LIR operates multiple 
separate networks, each with a separate routing policy. They cannot get multiple allocations from the RIR and they 
cannot announce the whole allocation as a whole because of the separate routing policies (who are sometimes required 
legally, for example when an NREN has both a commercial and an educational network). Deaggregating to /48's is not a 
good idea, but giving an LIR a few bits (something like 3 or 4) to deaggregate makes sense.

- Sander





-- 
-george william herbert
george.herbert () gmail com



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