[110061] in North American Network Operators' Group
Re: What is the most standard subnet length on internet
daemon@ATHENA.MIT.EDU (Nathan Ward)
Mon Dec 22 20:34:51 2008
From: Nathan Ward <nanog@daork.net>
To: nanog list <nanog@nanog.org>
In-Reply-To: <49503DDB.8030208@rollernet.us>
Date: Tue, 23 Dec 2008 14:34:39 +1300
Errors-To: nanog-bounces@nanog.org
On 23/12/2008, at 2:24 PM, Seth Mattinen wrote:
> Nathan Ward wrote:
>> On 23/12/2008, at 1:31 PM, Seth Mattinen wrote:
>>> Anyone running a platform that can't take a full table would apply
>>> such a filter to weed out anyone who likes to announce all of
>>> their space as /24's for "traffic engineering". If one does that
>>> and doesn't announce the aggregate as well, one could find
>>> themselves facing random black holes.
>> People are filtering /24s without a 0/0 route?
>
> I was just referring to LIR boundaries, but yes, I've seen it happen
> where someone splits their /22 into only /24s and doesn't announce
> the covering /22.
Yes, it happens all the time.
Let me rephrase; Are there people who are filtering /24s received from
eBGP peers who do not have a default route?
I mean the networks who receive those prefixes, not the ones who
advertise them.
--
Nathan Ward
