Suspecious anycast prefixes

Yaoqing(Joey) Liu joey.liuyq at
Thu May 5 16:48:31 UTC 2011

On Thu, May 5, 2011 at 8:10 AM, John Kristoff <jtk at> wrote:
> On Thu, 5 May 2011 11:54:17 +0300
> Joe Abley <jabley at> wrote:
>> Perhaps I'm misunderstanding the original question, but the assertion
>> that anybody is hijacking that particular prefix seems false.
> Furthermore, that exchange prefixes may often appear to be anycast is
> not unusual.  Those prefixes are often originated by multiple disparate
> networks who are connected to the exchange.
You mean that many different exchange points are using the same set of
prefixes as anycast service in different physical locations?
That sounds interesting to me.


 In a lightning talk I did
> at NANOG 41, I talked about mapping peering relationships at exchanges.
> When I noted that these prefixes are often announced by exchange
> participants, Louie Lee explained that some of his participants often
> announce the space to their transit customers so that monitoring and
> troubleshooting tools don't cause confusion (e.g. traceroutes).
> John

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