[102742] in North American Network Operators' Group
Re: BGP prefix filtering, how exactly? [Re: YouTube IP Hijacking]
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Mon Feb 25 17:16:23 2008
To: Randy Epstein <repstein@chello.at>
Cc: "'Pekka Savola'" <pekkas@netcore.fi>, "'Danny McPherson'" <danny@tcb.net>,
"'NANOG NANOG'" <nanog@merit.edu>
In-Reply-To: Your message of "Mon, 25 Feb 2008 15:29:01 EST."
<087b01c877ed$107f45b0$2801a8c0@D88CFA77634F40F>
From: Valdis.Kletnieks@vt.edu
Date: Mon, 25 Feb 2008 17:14:33 -0500
Errors-To: owner-nanog@merit.edu
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On Mon, 25 Feb 2008 15:29:01 EST, Randy Epstein said:
> > Our own or our singlehomed customers' address space -- we would reject
^^^^^^^^^^^
> > such an advertisement. The same inbound consistency check applies to
> > peers and upstreams/transits.
> What do you do when one of your multi-homed customers on your IP space has
> an outage on their connection to your network? How would your customers
> then reach that customer?
He explicitly said "single-homed". Of course, multi-homed requires different
handling, because you may hear their other home announce them (although again,
you probably shouldn't listen to *THAT* announcement either if *your* link to
them is up). And I posit that if you don't know if your customer is single or
multi-homed, you have *bigger* issues to deal with.
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