From Help Net Security:
Rise in DDoS reflection attacks using abandoned routing protocol
There's been an increase in the use of outdated Routing Information Protocol version one (RIPv1) for reflection and amplification attacks, according to Akamai.
RIPv1 is a fast, easy way to dynamically share route information using a small, multi-router network. A typical request is sent by a router running RIP when it is first configured or powered on. From there, any device listening for the requests will respond with a list of routes and updates that are sent as broadcasts.
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