Deep Inside a DNS Amplification DDoS Attack

The text discusses DNS Amplification Attacks, which are a way for attackers to magnify the amount of bandwidth they can target at a potential victim. These attacks have become increasingly common as network operators have failed to close open resolvers on their networks. One persistent attacker has been sending at least 20Gbps twenty-four hours a day against one of CloudFlare's customers, but the nature of CloudFlare's network means that the attack does not cause harm or add to bandwidth costs. The text also provides information on how to limit attackers abusing networks and encourages network operators to close open resolvers to prevent further attacks.