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Hackers might employ a variety of techniques to find an IP address of a trusted host. To Successfully perpetrate an IP Spoofing attack, hacker must find IP address of a machine that the target System Considers a trusted source. If intent is to gain unauthorized access, then Spoof IP address will be that of a system the target considers a trusted host. With IP spoofing, intruder sends message to a computer system with an IP address indicating message is coming from a different IP address than its actually coming from. In fact Dos attacks often mask actual IP address from where attack has originated from. Occasionally IP spoofing is done to mask the origins of a Dos attack. It was primarily theoretical until Robert Morris discovered a security weakness in the TCP protocol known as sequence prediction. IP Spoofing types of attacks, had been known to Security expert on the theoretical level. Concepts of IP Spoofing was initially discussed in academic circles as early as 1980. IP Spoofing is essentially a technique used by a hackers to gain unauthorized access to Computers.