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IPv4 and IPv6 hijacking by AS 6

Anurag Bhatia <me at anuragbhatia.com> writes:

> Similar for AS2.

I believe we've seen bogus low AS number announcements a few times
before, and they've usually been caused by attemts to configure
AS path prepending without understanding and/or reading the docs.

Someone might have wrongly assumed that

   set as-path prepend 133711 133711

could be written shorter like

   set as-path prepend 133711 2

and there you go...