Remotely Triggered Black Hole (RTBH) filtering is a technique that provides the ability to drop undesirable traffic before it enters a protected network. This paper describes RTBH filtering and its merits, operational gains, applications, and deployment considerations and provides sample router configurations. The paper describes the mitigation of Distributed-Denial-of-Service (DDoS) attacks within a single Interior Gateway Protocol (IGP) domain. It does not describe how to use RTBH filtering for mitigating the attack across multiple providers.
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