Re: How Not to Multihome

[Valdis.Kletnieks () vt edu]

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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