[dns-operations] Fwd: [AusNOG] Layer 7 - Distrusted Source (within a single AS) Distrusted Distention - Denial of Service Attack

David C Lawrence tale at akamai.com
Tue Oct 15 16:47:04 UTC 2013

Damian Menscher writes:
> I'm curious if anyone knows the significance of that 7-byte string?  They
> say it's common to all attack traffic, whether the query or the response,
> so that suggests it's the qname.  But it doesn't look like a valid qname
> to me, so open resolvers wouldn't respond to it with any amplification.
>  What am I missing?

The original report is quite unclear on where the string occurs in the
packet.  It could just be a common prefix for domain names for which
the responding resolvers would provide large negative answers.

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