QOS and Control-Theoretic Techniques for Intrusion Tolerance
Abstract
As we increasingly rely on information systems to support a multitude of critical operations, it becomes more and more important that these systems are able to deliver Quality of Service (QoS), even in the face of intrusions. This report examines two host-based resources, a router and a web server, and presents simulated models of modifications that can be made to these resources to make them QoS-capable. Two different QoS models are investigated for the router. The first model implements a router with a feedback control loop that monitors the instantaneous QoS guarantee and adjusts the router's admission control of new requests accordingly. The second router model, called Adjusted Weighted Shortest Processing Time, queues data packets according to a weight which is dependent on their initial priority weight and the amount of time they have awaited service. For the web server, six queuing disciplines are simulated and analyzed for their efficiency in delivering QoS. These disciplines are compared on the basis of selected QoS measurements, including lateness, drop rate, time-in-system and throughput. We find that there is not necessarily one best queuing rule to follow; the appropriate selection depends on the needs of that web server.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2004
- Accession Number
- ADA423167
Entities
People
- Nong Ye
Organizations
- Arizona State University