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Current implementations of the Internet Protocol version 6 (IPv6) use StateLess Address Auto Configuration (SLAAC) to assign network addresses to hosts. This technique produces a static value determined from the Media Access Control (MAC) address as the host portion, or Interface IDentifier (IID), of the IPv6 address. Some implementations create the IID using the MAC unobscured, while others compute a onetime hash value involving the MAC. As a result, the IID of the address remains the same, regardless of the network the node accesses. This IID assignment provides third parties (whether malicious or not) with the ability to track a node's physical location by using simple tools such as ping and traceroute.
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