Subj : Raspeberry Pi / SixXS
To   : Björn Felten
From : Markus Reschke
Date : Sun Oct 04 2015 12:38:48

Hello Björn!

Oct 04 11:14 2015, Björn Felten wrote to Markus Reschke:

 MR>> An IP address can identify a person.

 BF> Negatory! It can only identify an internet account.

Yes and no. By itself an IPv4 address would only identify the internet access. But when you add those nifty tracking methods you can identify persons, also hidden by NAT. But we're are talking about IPv6. No NAT, plenty of public IP addresses. Add SLAAC and suddenly the interface part of the IPv6 address identifies a device. The prefix doesn't matter at all. The only thing you still need is a link between the device and the person(s). This is the reason for PE (privacy extensions).

 BF> Think about a public WiFi AP...

Think SLAAC! Public WiFi APs are a security nightmare anyway.

For starters please read https://en.wikipedia.org/wiki/IPv6_address#Stateless_address_autoconfiguration
and the section below about Modified EUI-64 to understand how an IPv6 address is created via autoconfiguration.

Regards,
Markus

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