How is WFilter work?

• 1). WFilter is a sniffer. Broadcasted hubs and port mirror switches allow a computer to receive other computers' network packets.WFilter will analysis these packets and get the information we need.
• 2). How can WFilter block Internet connections? A TCP connection can easily be destroyed by some fake packets.That how WFilter can block TCP connections.But WFilter can not block UDP data by now.

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