Brown security. Brown as in POOPY!

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Sez this article:

According to Lyon, the unknown attackers hit a key portion of UltraDNS's network with a flood of spoofed DNS requests at a rate of around 4 to 5 gigabits per second, which is enough traffic to make just about any Web site on the Internet fall over (many Internet routers can handle only a few hundred megabits of traffic before they start to fail). But this was no normal DDoS attack– it was a kind of DDoS on the DNS system that security experts say has become alarmingly more common over the past six to eight months.

Known as DNS amplification attacks or "reflected DNS attacks," these kinds of DDoS assaults increase the traffic hurled at a victim by orders of magnitude. In a nutshell, the attackers find a whole bunch of poorly configured DNS servers and use them to create and send spoofed DNS requests from systems they control to the DNS servers they want to cripple. Because the DNS requests appear to be coming from other trusted DNS servers, the target servers have trouble distinguishing regular, legitimate DNS lookups from ones sent by the attackers. Sustained for long enough, the attack eventually overloads the victim's DNS servers with queries and knocks them out of commission.