[161504] in North American Network Operators' Group
Re: [c-nsp] DNS amplification
daemon@ATHENA.MIT.EDU (Joe Abley)
Mon Mar 18 10:54:45 2013
From: Joe Abley <jabley@hopcount.ca>
In-Reply-To: <51470E5F.4070804@gmail.com>
Date: Mon, 18 Mar 2013 10:54:37 -0400
To: Arturo Servin <arturo.servin@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 2013-03-18, at 08:53, Arturo Servin <arturo.servin@gmail.com> wrote:
> And about the routing table size, it is not multihomed sites the
> offenders, it is large ISPs fragmenting because of traffic engineering
> or because lack of BGP knowledge.
The usual concern with multi-homed end sites is that end sites with IPv4 =
PA addresses assigned from provider X who wish to multi-home with =
provider Y wind up adding at least two entries to the global table, a =
more specific route to each of X and Y (which X will need to leak =
beneath the covering supernet if it wants to deliver the customer any =
traffic).
I don't know of any recent analysis which differentiates between this =
multi-homing pressure on the global table vs. inter-domain traffic =
engineering or gratuitous deaggregation, but it's fair to say I have not =
been looking.
Joe=
