Enhancing the ISP Server using Service Differentiantion and Protecting Overload with Improved Security

ISP servers usually get overloads during a heavy-request period with an increasing traffic on the internet. Web-server cluster architectures have been widely employed to provide high-efficiency Internet services. This system is concerned with scalability of service provided by internet server providers. A Web server is modeled as a tank with an inflow and an outflow, and hence a Web-server cluster is modeled as a multiple-tanks system with certain inflow constraint using multithreaded and control technique. A control technique, called Continuous Token Control Technique, which adopts conventional Thread approach is proposed to address the issue of the traffic balancing on the Web-server clusters. To shield applications from the complexity of managing a large eventdriven system, the underlying platform is responsible for managing the details of thread management, event scheduling, and I/O. The second goal is to enable load conditioning. Incoming request queues are exposed to application modules, allowing them to drop, the servers must include techniques and mechanisms that guarantee a minimum level of QoS or reorder requests during periods of heavy load. The underlying system can also make global resource management decisions without the intervention of the application. This is also designed with adequate generality to support a large class of server applications, including dynamic Web servers, peer-to-peer, etc. It can be extended to run in individual system with additional security features.