[Bug 250919] IPV6_PRIVACY=rfc3041 in /etc/sysconfig/networking/devices/ifcfg-eth0 does not take effect

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https://bugzilla.redhat.com/show_bug.cgi?id=250919

--- Comment #45 from Peter Bieringer <pb at bieringer.de> 2011-04-28 16:18:13 EDT ---
Regarding https://bugzilla.redhat.com/show_bug.cgi?id=250919#c43

using udev for setting the sysctl toggle for IPv6 privacy won't work on Fedora
14 out-of-the-box:

the IPv6 module is loaded by initial RAM disk *after* udev initialization,
means if e.g. an udev rule like following

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
   ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", 
   RUN+="sysctl net.ipv6.conf.%k.use_tempaddr=2" 

won't work.

The only workaround I found was:
- create a new RAM disk with "--with ipv6"
- extend boot option with "rdloaddriver=ipv6"
- use full qualified path for sysctl

So udev initialization is imho no option at all for setting IPv6 privacy,
especially, if this should be controllable per device.

If one would use the udev mechanism for per interface settings, each time a new
RAM disk must be created...

Imho, ifcfg-INTERFACE would be still a good location for such interface
settings to keep configuration in one place.


Regarding https://bugzilla.redhat.com/show_bug.cgi?id=250919#c44

In an extended version of ifup-ipv6 (on deepspace6), another "privacy" mode is
supported, which is based on setting a random private MAC address on the
interface before bringing up. Therefore the intention of using "rfc3041" as
method was that IPV6_PRIVACY should be flexible to support others than the RFC
3041 one.

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