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I am trying IPv6 and I want to activate the privacy address mechanism.

I have read everywhere to add "net.ipv6.conf.eth1.use_tempaddr=2" to
/etc/sysctl.conf.

What I did. I tried a "sysctl -p" followed by "ifconfig eth1 down" and "ifconfig eth1 up". 
This worked like a charm.

But after a reboot, the value of
/proc/sys/net/ipv6/conf/eth1/use_tempaddr is always 0.

I tried to add those lines :

net.ipv6.conf.all.use_tempaddr=2
net.ipv6.conf.default.use_tempaddr=2

to /etc/sysctl.conf, but nothing to do, after a reboot, the value of
/proc/sys/net/ipv6/conf/eth1/use_tempaddr is always 0.

So I could write a script to make  "sysctl -p; ifconfig eth1 down;
ifconfig eth1 up", but I think there is a bug somewhere no ?

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: network-manager 0.8.4~git.20110319t175609.d14809b-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Date: Sun Jun 19 09:33:32 2011
EcryptfsInUse: Yes
Gconf:
 
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007.1)
IpRoute:
 192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.1  metric 1 
 169.254.0.0/16 dev eth1  scope link  metric 1000 
 default via 192.168.1.254 dev eth1  proto static
IwConfig:
 lo        no wireless extensions.
 
 eth1      no wireless extensions.
 
 vboxnet0  no wireless extensions.
Keyfiles: Error: [Errno 2] Aucun fichier ou dossier de ce type
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 LANGUAGE=fr_FR:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
RfKill:
 
SourcePackage: network-manager
UpgradeStatus: Upgraded to natty on 2011-05-02 (47 days ago)

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty
-- 
use_tempaddr always at 0 after a reboot
https://bugs.launchpad.net/bugs/799322
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