While it is widely understood that criminal miscreants are subverting large numbers of Internet-connected computers (e.g., for bots, spyware, SPAM forwarding, etc.) it is less well appreciated that Internet routers are also being actively targeted and compromised. Indeed, due their central role in end-to-end communication, a compromised router can be leveraged to empower a wide range of direct attacks including eavesdropping, man-in-the-middle subterfuge and denial-of-service. In response, a range of specialized anomaly detection protocols has been proposed to detect misbehaving packet forwarding between routers. This paper provides a general framework for understanding the design space of this work and reviews the capabilities of various detection protocols.
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