Comment 26 for bug 1068756

In case anyone's interested in knowing why setting net/ipv6/conf/all/use_tempaddr=2 no longer changes the value of pre-existing interfaces (thus ensuring privacy extensions are disabled by default for physical interfaces configured through /etc/network/interfaces), it's because http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git/commit/?id=c999e7dff4570e4c28a0953e7189c0c31343ce62 was dropped from the Ubuntu kernel packages starting with Utopic.