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We present an analysis of a class of attacks we call address spoofing. With the recent publicity surrounding an instance of such an attack, we have written up a presentation we gave nine months before the attack; we include an analysis of the recent attack. First, we present some fundamentals behind network communication and routing. Next we discuss the class of attacks we call address spoofing. We then give a real-world example of an attack in this class. Finally, we address some of the questions related to these attacks.