On Fri, 13 Apr 2018, Bjørn Mork wrote:

Date: Fri, 13 Apr 2018 10:13:47 +0200
From: Bjørn Mork <bj...@mork.no>
To: Anurag Bhatia <m...@anuragbhatia.com>
Cc: North American Network Operators' Group <nanog@nanog.org>
Subject: Re: IPv4 and IPv6 hijacking by AS 6

Anurag Bhatia <m...@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...

Yes, ASN2 sees about 1-4 configuration related "rogue" announcements per month. What is going on right now does not appear to be a small misconfiguration.

The only route we (University of Delaware) are announcing w/ ASN2 is


Jason Cash
Deputy CIO
University of Delaware

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