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When you got that magic touch. How to Spy on the Web Traffic for Any Computers on Your Network: An Intro to ARP Poisoning. How to Spy on the Web Traffic for Any Computers on Your Network: An Intro to ARP Poisoning When your computer first connects to a nework, it sends out a request on the network to lease an IP from the router. The router then leases your computer an unused IP address, which is used as a unique routing address for sending traffic that is meant for you, to you. As everything tends to, this method has its flaws. When you're on a network, local attackers can perform what is called a man-in-the-middle attack.
To perform this locally, we need to spoof ourselves to look like our router and start requesting traffic from another computer on our network. ARP or Address Resolution Protocol is a method of letting the network map out IPs rather than giving each computer a table of the mapping. Step 2 ARP Poison & Run Ettercap When the target computer sends enecrypted data across the network (non-HTTPS websites), ettercap will see it and dump the packets into the file "cap" on the Desktop.