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IP anycast is used for services such as DNS and Content Delivery Networks(CDN) to provide the capacity to handle Distributed Denial-of-Service (DDoS)attacks. During a DDoS attack service operators redistribute traffic betweenanycast sites to take advantage of sites with unused or greater capacity.Depending on site traffic and attack size, operators may instead concentrateattackers in a few sites to preserve operation in others. Operators use theseactions during attacks, but how to do so has not been described systematicallyor publicly. This paper describes several methods to use BGP to shift trafficwhen under DDoS, and shows that a response playbook can provide a menu ofresponses that are options during an attack. To choose an appropriate responsefrom this playbook, we also describe a new method to estimate true attack size,even though the operator's view during the attack is incomplete. Finally,operator choices are constrained by distributed routing policies, and not allare helpful. We explore how specific anycast deployment can constrain optionsin this playbook, and are the first to measure how generally applicable theyare across multiple anycast networks.

Anycast Agility: Network Playbooks to Fight DDoS