Legitimate Usage
ARP spoofing can also be used for legitimate purposes. For instance, network registration tools may redirect unregistered hosts to a signup page before allowing them full access to the network. This technique is used in hotels and other semi-public networks to allow traveling laptop users to access the Internet through a device known as a head end processor (HEP).
ARP spoofing can also be used to implement redundancy of network services. A backup server may use ARP spoofing to take over for a defective server and transparently offer redundancy.
ARP spoofing is often used by developers to debug IP traffic between two hosts when a switch is in use.
Read more about this topic: ARP Spoofing
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