[193073] in North American Network Operators' Group
Re: Prepending with another ASN you don't own
daemon@ATHENA.MIT.EDU (Randy Bush)
Fri Dec 16 18:41:24 2016
X-Original-To: nanog@nanog.org
Date: Sat, 17 Dec 2016 08:22:42 +0900
From: Randy Bush <randy@psg.com>
To: Jon Lewis <jlewis@lewis.org>
In-Reply-To: <Pine.LNX.4.61.1612161718560.7679@soloth.lewis.org>
Cc: North American Network Operators' Group <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
>> this is called path poisoning. an italian friend used it in his phd
>> thesis. a few friends and i used it to detect use of default across
>> the internet.
>
> I've done this in the past as a work-around for insufficient BGP
> community support. Just prepending the AS I wanted to ignore the
> paths.
>
> But, if the problem is an anycast CDN choosing a sub-optimal path to
> reach you, you might try reaching out to them. They're probably just
> as, if not more interested, in getting their traffic to you as
> efficiently as possible.
apologies. i should have been more explicit. both of the examples
were using path poisoning for routing research. it is not a technique
i would reccommend in normal operations.
randy
