Fix your DNS servers or risk aiding DDoS attacks

http://en.wikipedia.org/wiki/Domain_Name_System

Although this week’s large-scale DDoS attack against Spamhaus may not have been as crippling as early reports suggested, they were noteworthy in that they shined spotlights on a couple of the Internet’s many underlying weaknesses.

Among them are open DNS resolvers, which enable a technique called DNS amplification wherein attackers bombard target servers with as much as 100 bytes of network-clogging traffic for every one byte they send out.

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Story added 2. April 2013, content source with full text you can find at link above.