Quote:
National Cyber Awareness System
TA13-088A: DNS Amplification Attacks
Original release date: March 29, 2013
Systems Affected
* Domain Name System (DNS) servers
Overview
A Domain Name Server (DNS) Amplification attack is a popular form of
Distributed Denial of Service (DDoS) that relies on the use of
publically accessible open recursive DNS servers to overwhelm a victim
system with DNS response traffic.
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The entire document, well worth your time to read, can be found at
http://www.us-cert.gov/ncas/alerts/TA13-088A
Hope this helps some.
