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ARP poisoning
From NetSec
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Description
ARP poisoning is a form of network exploitation that attempts to change the arp table, which holds records of IP addresses and their assigned MAC address. If these records can be modified, devices will send traffic on a LAN to the MAC address for the host of the assigned IP address, resulting in a successful man in the middle attack. This allows an attacker to impersonate computers and gateways, and can result in sniffing a vast majority of network traffic. Depending on the sniffer's throughput, this may also cause substantial packet loss if successful.
