[165632] in North American Network Operators' Group
Re: Cymru Bogon AS path change
daemon@ATHENA.MIT.EDU (Nick Hilliard)
Mon Sep 16 13:10:39 2013
X-Envelope-To: nanog@nanog.org
Date: Mon, 16 Sep 2013 18:10:14 +0100
From: Nick Hilliard <nick@foobar.org>
To: Ben Bartsch <uwcableguy@gmail.com>
In-Reply-To: <CAOvEG7NTrjxB_FFeEthKE8mCP1v8g1FBiq42eew9UOsh+NrVfw@mail.gmail.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 16/09/2013 18:01, Ben Bartsch wrote:
> We certainly did when we starting advertising all the bogons to our ISP
> peers. Probably should have had an inbound AS path filter on that cymru
> peering...
better still, tag them all with a BGP community to make a note that they
are bogons from Cymru (i.e. immediately identifiable throughout your
network), and also tag them with no-export to ensure that they cannot
propagate outside your asn.
as-path filters are inefficient from several points of view.
Nick
