IP spoofing

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IP spoofing

Inserting the IP address of an authorized user into the transmission of an unauthorized user in order to gain illegal access to a computer system. Routers and other firewall implementations can be programmed to identify this discrepancy. See firewall.
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IP address forgery, also known as IP address spoofing, or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a website, hijack browsers, or gain access to a network.
A reflection DDoS attack is when forged requests are sent to a very large number of Internet-connected devices that reply to the requests that use IP address spoofing, where the 'source' address is set to the IP address of the actual target of the attack, where all replies are sent.
In the case of system-to-system communications, this provides security against such hacker tactics as IP address spoofing.
Blocks IP address spoofing - prevents spoofing attacks
IP Source Guard (IPSG) can prevent IP address spoofing, validate incoming packets, and drop whose IP addresses that are spoofed.