[73959] in North American Network Operators' Group
Re: ISP Policies
daemon@ATHENA.MIT.EDU (Howard C. Berkowitz)
Thu Sep 9 14:00:27 2004
In-Reply-To: <002801c4962e$a1a4ca50$e90218ac@Floyd>
Date: Thu, 9 Sep 2004 13:57:44 -0400
To: <nanog@merit.edu>
From: "Howard C. Berkowitz" <hcb@gettcomm.com>
Errors-To: owner-nanog-outgoing@merit.edu
At 11:04 AM +0530 9/9/04, Tulip Rasputin wrote:
>Hi Chris,
>
>>Or, you just don't want to send traffic through Bill Manning's ASN because
>>you dislike his hawiian T-Shirt Policy? There are probably a few hundred
>>reasosn why you'd avoid an ASN... In general though I'd think that like
>>Michel said: "It's a pain and its doing something that bgp should do for
>>you without lots of messing about"
>
>That's why i explicitly asked for some "social/political/etc."
>reasons where an ISP may not want his traffic to traverse some
>particular AS number(s). Something which is beyond BGP to determine
>as of now ! :-)
>
>I believe with the responses that i received both on the list and
>offline, that it is indeed quite normal for ISPs to filter routes
>based on the AS Paths for 'other' reasons. Reasons, quite beyond BGP
>as a protocol to handle! And this can happen, when an ISP doesnt
>want its traffic to traverse some AS(es).
>
>Thanks,
>Tulip
IIRC, at some long ago time, there was a Canadian policy, derived
from a policy on telco transit, that two Canadian providers could not
use transit through the USA to get to one another. This is long gone.
I can't say if it is still the case, but, at one point, the PRC would
drop routes that used Taiwan as transit.
