Comment 20 for bug 994931

verified this works as expected in utopic.
  $ vals() { for i in net.ipv6.conf.all.use_tempaddr net.ipv6.conf.default.use_tempaddr; do
                  [ -n "$1" ] && { sudo sysctl $i=$1 || return; } || sysctl $i; done; }
  $ vals 0
  net.ipv6.conf.all.use_tempaddr = 0
  net.ipv6.conf.default.use_tempaddr = 0

  $ sudo ip -6 addr del 2001:db8::1:3/64 dev eth0 &>/dev/null;
  $ sudo ip -6 addr add 2001:db8::1:3/64 dev eth0

  $ vals 2
  net.ipv6.conf.all.use_tempaddr = 2
  net.ipv6.conf.default.use_tempaddr = 2
  $ ip -6 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:db8::1:3/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fefd:d570/64 scope link
       valid_lft forever preferred_lft forever
  $ vals 0
  net.ipv6.conf.all.use_tempaddr = 0
  net.ipv6.conf.default.use_tempaddr = 0

  $ ip -6 addr show dev eth0
  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:db8::1:3/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fefd:d570/64 scope link
       valid_lft forever preferred_lft forever

  $ uname -r
  3.16.0-21-generic