ISP Policies

Thu Sep 9 17:57:44 UTC 2004

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.