The same applies to Ubuntu 12.04 server.
Despite what interfaces(5) says:

              privext int
                     Privacy extensions (RFC3041) (0=off, 1=assign, 2=prefer)

That statement does not seem to get honoured.
This entry in /etc/nework/interfaces worked fine at least in beta2, but now 
does not work any more:

iface eth0 inet6 static
        address 2001:610:148:dead::54
        gateway 2001:610:148:dead::1
        netmask 64
        autoconf 0
        privext 0
        dns-search terena.org
        dns-domain terena.org
        dns-nameservers 2001:610:1:800a:192:87:106:105 
2001:610:188:140:145:100:188:188


What's worse, booting a 12.04 machine with this very config will yield no IPv6 
connectivity *at all*:

eth0      Link encap:Ethernet  HWaddr 00:50:56:86:00:25
          inet addr:192.87.30.54  Bcast:192.87.30.63  Mask:255.255.255.192
          inet6 addr: fe80::250:56ff:fe86:25/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:97 errors:0 dropped:0 overruns:0 frame:0
          TX packets:57 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12528 (12.5 KB)  TX bytes:9673 (9.6 KB)


If privext=0 doesn't get honoured and actually = 2 (as per 
/etc/sysctl.d/10-ipv6-privacy.conf), then it looks like autoconf=0 and 
privext=2 don't mix.

Commenting out /etc/sysctl.d/10-ipv6-privacy.conf, or setting autoconf=1
both fix the problem.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/998223

Title:
  Turns on IPv6 privacy extensions regardless of settings in
  10-ipv6-privacy.conf

Status in “network-manager” package in Ubuntu:
  In Progress

Bug description:
  After installing the latest network-manager package that fixes  bug
  990011, I noticed that my IPv6 address was suddenly different because
  IPv6 privacy extensions had been turned on. Turning them off in
  /etc/sysctl.d/10-ipv6-privacy.conf doesn't stop network-manager from
  enabling it. I'm using the default automatically generated wired
  connection, so there are no connection settings in /etc/NetworkManager
  /system-connections.

  If I change some settings so that NM writes the connection to system-
  connections and then add ip6-privacy=0 to the configuration the
  privacy extensions are turned off, but it would be nice if that was
  also the case when it is turned of using
  /etc/sysctl.d/10-ipv6-privacy.conf.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/998223/+subscriptions

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