[64127] in North American Network Operators' Group
Re: Pitfalls of annoucing /24s
daemon@ATHENA.MIT.EDU (Marshall Eubanks)
Thu Oct 16 12:49:32 2003
Date: Thu, 16 Oct 2003 12:30:30 -0400
Cc: Andrew Dul <andrew.dul@quark.net>, michael@awtechnologies.com,
<nanog@merit.edu>
To: Forrest <forrest@almighty.c64.org>
From: Marshall Eubanks <tme@multicasttech.com>
In-Reply-To: <Pine.LNX.4.44.0310152244310.19325-100000@almighty.c64.org>
Errors-To: owner-nanog-outgoing@merit.edu
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
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