Re: Pitfalls of annoucing /24s

[Marshall Eubanks <tme () multicasttech com>]

Hello;

On Wednesday, October 15, 2003, at 11:57 PM, Forrest wrote:

> True enough, but are there any providers currently that filter /24's 
> from
> the old Class C space that /24's were assigned directly from?

As someone who is multihomed but uses others /24's, I am sensitive to
this.

I do not _think_ that any major provider filters on /24's now - but it's
fairly common to filter on /25 and longer.


> I realize that if proposal 2002-3 does get passed but everyone filters
> those prefixes then it will be a completely worthless proposal, and 
> even
> worse than using PA space.

I had good luck contacting the ISP's that were filtering and asking them
nicely not to. I think that providers will mostly follow ARIN's lead.


> It seems to me that proposal 2002-3 could enable providers to filter 
> more
> efficiently however.  They could accept the long prefixes out of the
> micro-assignment block, while filtering out all the garbage /24's in 
> the
> other space caused by people needlessly announcing every /24 out of 
> their
> large aggregate.

I would agree.

> Forrest

Regards
Marshall Eubanks

> On Wed, 15 Oct 2003, Andrew Dul wrote:
>
> > Forrest,
> >
> > Even if ARIN passes this policy that will not make any provider change
> > their filtering policy.  It is true that many providers do use the 
> > ARIN
> > allocation sizes to create their filtering rules but the two are not
> > inherently linked.  Any ASN can choose the filter on what ever rule 
> > set
> > they choose.
> >
> > Andrew
                                 Regards
                                 Marshall Eubanks

T.M. Eubanks
e-mail : tme () multicasttech com
http://www.multicasttech.com

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