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The stack in various forms has been widely used as an architectural template for networking systems. Recently the stack has been subject to criticism for a lack of flexibility. However, when it comes right down to it nobody has offered a truly compelling alternative. Various "Cross-layer" optimizations have been proposed, but these optimizations are frequently hacks to achieve a particular goal and offer no direct insight into why the existing network stack is inadequate. The authors propose that a fundamental problem with the existing network stack is that it attempts to layer functionality that is not well-suited to layering.
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