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How is it possible to redirect all the traffic from the client to the raspberry pi (in order to analyse it and block some packets. it's like a firewall) and then send to to the router and vice-versa !
for the two cases: wireless and wire
Besides we don't have access to the router to make change or configuration.
raspberry pi is like a man in the middle but the client knows that
You wouldn't want to do that.
If you want to analyze your traffic, you need to use a tool like Wireshark or TShark to sniff the packets as they go by. It works by setting your pi to Promiscuous Mode so the you see all the traffic, not just the traffic for that address.
