ARP Poisoning

 Address Resolution Protocol (ARP) Poisoning

An attacker can send a false ARP reply message to the default network gateway(192.168.1.1), telling it that this MAC address should be associated with target's IP address.

When the default gateway has received this message and broadcasts its changes to all other devices on the network, all of the target's traffic to every devices on the network travels through the attacker's computer, allowing the attacker to inspect or modify traffic before forwarding it to its destination. 

Users targeted by ARP Poisoning rarely realize that their traffic is inspected by an attacker. Also ARP Poisoning can be used to cause a denial-of-service (DOS) condition over a LAN by simply intercepting and not sending the target's packets.

There are ARP Poisoning/Spoofing Tools Available 



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