Why Spoof?
As in the preceding example, if an attacker can convince a computer or a network that he is someone else (a trusted party), he can probably access information he normally could not get. For example, if you trust John but you do not trust Joe, and Joe can spoof his identity to appear to be John, you will trust Joe (because you think he is John); and Joe can get the access he wants.
When engineers design networks, they often set up access permissions and trusts based on information like IP addresses. It is critical that you understand how easy it is to spoof such information, so that you can design better security models for your computer networks. Only by understanding the current limitations can you move forward and build networks ...
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