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Dynamic and flexible composition of higher-level network services, such as security, QoS, or adaptive services are required by future network applications. However, the development of such extensible applications makes them rather complex. In addition, many old applications, which do not support such services, would stick to be used. To solve these problems, the authors propose a generic and multi-platform infrastructure called FreeNA1 that extends existing applications by transparently incorporating the services to them. FreeNA offers abstract interfaces such that users can insert the services into each packet flow based on a configuration file.
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