[102739] in North American Network Operators' Group
RE: BGP prefix filtering, how exactly? [Re: YouTube IP Hijacking]
daemon@ATHENA.MIT.EDU (Randy Epstein)
Mon Feb 25 15:58:57 2008
From: "Randy Epstein" <repstein@chello.at>
To: "'Pekka Savola'" <pekkas@netcore.fi>, "'Danny McPherson'" <danny@tcb.net>
Cc: "'NANOG NANOG'" <nanog@merit.edu>
Date: Mon, 25 Feb 2008 15:29:01 -0500
In-Reply-To: <alpine.LRH.1.00.0802252113500.25609@netcore.fi>
Errors-To: owner-nanog@merit.edu
<clip>
> 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.
>
> If it's someone else's or a more specific or the same prefix as our
> multihomed customers -- we accept it. There isn't anything else we
> can do in practise which would not hurt legitimate routing..
<clip>
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?
Although this wouldn't be THAT BIG of a deal for small networks, if say a
larger or a Tier-1 provider practiced this (AFAIK, the only somewhat large
network to do this is, believe it or not, PCCW), your customer would
experience a major outage.
There must be a better way. :)
> Pekka Savola
Regards,
Randy
