Efficient Probing Techniques for Fault Diagnosis

Abstract — Increase in the network usage and the widespread application of networks for more and more performance critical applications has caused a demand for tools that can monitor network health with minimum management traffic. Adaptive probing holds a potential to provide effective tools for end-toend monitoring and fault diagnosis over a network. In this paper we present adaptive probing tools that meet the requirements to provide an effective and efficient solution for fault diagnosis. In this paper, we propose adaptive probing based algorithms to perform fault localization by adapting the probe set to localize the faults in the network. We compare the performance and efficiency of the proposed algorithms through simulation results

Fine-Grained Capabilities for Flooding DDoS Defense Using Client Reputations ABSTRACT

Recently proposed capability mechanisms offer one part of the answer to the DDoS problem. They empower the victim to control the traffic it receives by selectively granting access to well-behaved clients via short-lived tickets. One major question still remains unanswered: how can victims distinguish between well-behaved and ill-behaved clients during the ticket-granting process. This paper offers one possible answer to this question, while also refining the basic capability mechanism. We propose the following novel features: (1) Reputationbased ticket-granting – long-term behavior of a client influences whether future tickets will be granted, (2) Finegrained capabilities, which authorize access to the victim at a specified priority level based on a client’s prior behavior, (3) Destination-based capabilities, granted by the defense located at the victim; this reduces operational cost, and breaks dependence of tickets on routes

Active probing approach for fault localization in computer networks

Abstract—Active probing is an active network monitoring technique that has potential for developing effective solutions for fault localization. In this paper we use active probing to present an approach to develop tools for performing fault localization. We discuss various design issues involved and propose architecture for building such a tool. We describe an algorithm for probe set selection for problem detection and present simulation results to show its effectiveness. We demonstrate through analysis and experiments that active probing has the potential to greatly reduce the probe traffic and the fault diagnosis time. Keywords- active probing; fault localization; active monitoring; probe station selection; problem detection; problem determination; I