Olytibar

Unfortunately the IPv6 Privacy Extension is disabled by default in Linux. The result is, that the Interface Identifier is generated with the MAC-Address. Therefore a single device becomes trackable, even if the prefix changes. The Privacy Extension prevents this by generating a random Interface Identifier. To enable it, add those lines to your /etc/sysctl.conf

net.ipv6.conf.all.use_tempaddr=2
net.ipv6.conf.default.use_tempaddr=2
net.ipv6.conf.<yourinterface(eth0,wlan0,…)>.use_tempaddr=2

That’s it. Just replace yourinterface with whatever the name of your network interface is. Should be similiar in Mac OS X. The Privacy Extension is enabled by default in Windows.