[99930] in North American Network Operators' Group
Re: How Not to Multihome
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Tue Oct 9 13:56:12 2007
To: "Patrick W. Gilmore" <patrick@ianai.net>
Cc: nanog <nanog@merit.edu>
In-Reply-To: Your message of "Mon, 08 Oct 2007 21:32:50 EDT."
<75CCBDEB-0B90-4562-9FDA-31F355BADA4B@ianai.net>
From: Valdis.Kletnieks@vt.edu
Date: Tue, 09 Oct 2007 13:53:45 -0400
Errors-To: owner-nanog@merit.edu
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On Mon, 08 Oct 2007 21:32:50 EDT, "Patrick W. Gilmore" said:
> On Oct 8, 2007, at 6:45 PM, Justin M. Streiner wrote:
> > I never said it was. My experience, both in my previous life as
> > the operator of a regional ISP and since then in other capacities
> > is that having disjoint origins for a chunk of some provider's
> > address space is basically asking for trouble, and it's the kind of
> > trouble that may ony pop up when something breaks.
>
> I'm afraid your experience is not the same as many, many people.
>
> 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....
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