| The human society has been entering a network-centered information era, in which users need access faster, more reliable and functional network services. The increasing popularity of the World Wide Web leads to an exponential growth in the Internet usage. More and more network sites have attracted traffic at an unprecedented scale, they often worry about how to scale up their systems over time to meet this increasing demand, and how their systems remain 24x7 available. Future applications will need higher throughput, interaction and security, which requires service platform provide more processing power and higher availability. Therefore, the Internet research community faces a number of challenges at providing a feasible framework and design methodologies for constructing high-performance, highly scalable and highly available network services. The load balance technique for network service addressed in this thesis represents a step towards ameliorating this situation.On the analysis of present and future network service requirements, we present the architecture of cluster-based scalable network services called FreeBSD Super Server, which has two tiers of load balancer and server cluster. The load balancer supports IP load balancing. The FSS system provides single IP accessing manner, load balancing, scalability and availability, which can be deployed to build many scalable network services. Furthermore, FSS can do load balancing between geographically distributed FSS system, which can save bandwidth, improve quality of network services and be disaster-tolerant.Meantime, we put forward a virtual route technique, design a load measurement algorithm and a route measurement algorithm, give a solution for the bottleneck problem of network. Finally the performance of FSS is tested. Basing on the results, we draw a conclusion that FSS has the characteristics such as reasonable load balancing, high performance forwarding, low spending on dispatching, and linear scalability.
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