Enable Raspbian Wheezy IPv6 Privacy Extensions
If you have activated IPv6 in Raspberry Pi (Raspbian Wheezy), then all IPv6 addresses are formed from the MAC address (hardware address). Unfortunately, it is always the same, which is why the client or host concerned can be identified by this address. For privacy reasons, that’s a problem.

That’s why with Privacy Extensions for IPv6, there’s an extension that protects privacy. However, this is not always automatically active when IPv6 is switched on or activated.
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