Antispoofing is a technique for identifying and dropping packets that have a false source address.
In a spoofing attack, the source address of an incoming packet is changed to make it appear as if it is coming from a known, trusted source. Spoofed packets are commonly used to carry out denial of service (DoS) attacks, exploit network and system vulnerabilities and gain unauthorized access to corporate networks and data.
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Spoofed packets can be detected by setting up rules on a firewall, router or other network gateway that examines incoming packets. For example, if the rule is to filter out packets that have conflicting source addresses, a packet that shows a source address from the internal network will be automatically dropped because internal packets are never filtered by outside-facing interfaces.
Antispoofing, which is sometimes spelled anti-spoofing, is sometimes implemented by Internet Service Providers (ISPs) on behalf of their customers.