Can they grab local IPv6 addresses using this? While a huge number of computers are going to be on 192.168.0.1, their IPv6 address could actually be unique, making user fingerprinting easier.
IPv4 you'd have a small range of IP addresses but with IPv6 you can have a different IPv6 address each hour if you so choose.
http://www.internetsociety.org/deploy360/resources/privacy-e...