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Re: Pitfalls of annoucing /24s

  • From: Marshall Eubanks
  • Date: Thu Oct 16 12:52:03 2003 
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 : [email protected]
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