[nutjob2]

That's entirely misleading.

The MAC address is used if you autoconfigure IPv6, it's not required. Also you can enable privacy by requesting your host to generate a random host identifier.

http://en.wikipedia.org/wiki/IPv6#Privacy

[stephen_g]

I believe pretty much every single IP stack implementation uses privacy extensions by default now.

[justincormack]

Actually I don't think that is true yet. FreeBSD does not by default for example.

[politician]

It's not entirely misleading if you can imagine a certain government requiring registration of devices before allowing access to networks like the Internet.

[kiallmacinnes]

I'm not sure I see how IPv6 would really make that any easier? Privicy extensions or not...

Forging a MAC address is trivial.. If that's all you use to enforce the registration, it will be trivial to bypass!

And - if government wants to do this.. There are easier ways.