Stateful middleboxes such as intrusion detection systems and stateful firewalls rely on TCP flow management to keep track of on-going network connections. Implementing complex TCP state management modules for network appliances in high-speed networks is difficult. This is especially more challenging due to the lack of a reusable networking stack that provides a development interface that monitors fine-grained flow states for stateful middleboxes. This presentation describes the middleware Operating System (mOS) which aims to address this gap.

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