[88289] in North American Network Operators' Group
Re: So -- what did happen to Panix?
daemon@ATHENA.MIT.EDU (bmanning@vacation.karoshi.com)
Fri Jan 27 12:44:21 2006
Date: Fri, 27 Jan 2006 17:43:53 +0000
From: bmanning@vacation.karoshi.com
To: Joe Abley <jabley@isc.org>
Cc: bmanning@vacation.karoshi.com, Randy Bush <randy@psg.com>,
Jared Mauch <jared@puck.nether.net>, NANOG list <nanog@nanog.org>
In-Reply-To: <DAC122B3-6147-4729-9932-45920AE284FE@isc.org>
Errors-To: owner-nanog@merit.edu
On Fri, Jan 27, 2006 at 11:39:27AM -0500, Joe Abley wrote:
>
> On 27-Jan-2006, at 11:12, bmanning@vacation.karoshi.com wrote:
>
> > but by definition, the right-most entry is the prefix origin...
>
> Suppose AS 9327 decides to originate 198.32.6.0/24, but prepends 4555
> to the AS_PATH as it does so. Suppose 9327's uses a transit provider
> which builds prefix filters from the IRR, and the "as9327" aut-num
> object is modified to include policy which suggests 9327 provides
> transit for 4555. Suppose this is not actually the case, though, and
> in fact 9327 is a rogue AS which is trying to capture 4555's traffic.
>
> The rest of the world sees a prefix with an AS_PATH attribute which
> ends with "9327 4555".
>
> In this case, from the point of view of those trying to discern
> legitimacy of advertisements, what is the origin of the prefix? Is it
> 4555, or 9327?
from BGP's perspective, you tell me. being the naive BGP
listen/speaker - i think that AS 4555 is the origin.
now... what does Prefix 198.32.6.0/24 say is the correct
origin?
> Is it possible to tell, from just the right-most entry in the AS_PATH
> attribute?
nope - but you have jumped right into the path question.
(what does the as4555 aut-num object say about using 9327
as an upstream AS?)
> Joe
>
> [note: 9327 is not a rogue AS, in fact. This is just hypothetical :-)]
sez you :) (reminder to send Cingular the royalty check if you
receive the above two characters ":" and ")" as listed above
AND you chose to infer mood or intent.)
I think -all- AS are run by rouges and pirates.
-- (headless) bill
