[99933] in North American Network Operators' Group
Re: How Not to Multihome
daemon@ATHENA.MIT.EDU (Patrick W. Gilmore)
Tue Oct 9 14:15:04 2007
In-Reply-To: <24890.1191952425@turing-police.cc.vt.edu>
Cc: "Patrick W. Gilmore" <patrick@ianai.net>
From: "Patrick W. Gilmore" <patrick@ianai.net>
Date: Tue, 9 Oct 2007 14:01:40 -0400
To: nanog@merit.edu
Errors-To: owner-nanog@merit.edu
On Oct 9, 2007, at 1:53 PM, Valdis.Kletnieks@vt.edu wrote:
>> There are currently ~1500 prefixes with inconsistent origin AS.
>> These are trivially identifiable:
>>
>> <http://www.cymru.com/BGP/incon_asn_list.html>
>>
>> Some of them are obvious mistakes (I doubt HKSuper is supposed to
>> originate 4/8). But many of them are not, and the Internet works
>> just fine.
>
> And as Justin said, some sizable fraction of those 1500 prefixes are
> quite possibly *appearing* to Work Just Fine currently, but if
> something
> breaks, that will be 1500 NOC monkeys facing some difficult-to-debug
> routing issues....
Considering the number of inconsistently originated prefixes has been
non-trivial for at least a decade, I have trouble believing this is a
huge threat to the internet. Or even those 1500 NOC monkeys. (And
wouldn't it be 3K - at least 2 ASNs per prefix? :)
--
TTFN,
patrick
